reglab/statecodes huggingface dataset:
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart E - SEWAGE TREATMENT WORKS › Section 370.520 - Design

Current through Register Vol. 48, No. 28, July 12, 2024
a) Type of
				Treatment
1) As a minimum, the following
				items shall be considered in the selection of the type of treatment:
A) Present and future effluent
				requirements.
B) Location and local
				topography of the plant site.
C)
				The effects of industrial wastes likely to be encountered.
D) Ultimate disposal of sludge.
E) System capital costs.
F) System operating and maintenance costs and
				basic energy requirements.
G)
				Existing unit process performance and capacity.
H) Process complexity governing operating
				personnel requirements.
I)
				Environmental impact on present and future adjacent land use.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart E - SEWAGE TREATMENT WORKS › Section 370.530 - Plant Details

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Installation of Mechanical Equipment
The specifications shall be so written that the installation
				  and initial operation of major items of mechanical equipment will be inspected
				  and approved by a representative of the manufacturer.
b) Bypasses
Properly located and arranged bypass structures and piping
				  shall be provided so that each unit of the plant can be removed from service
				  independently. The bypass design shall facilitate plant operation during unit
				  maintenance and emergency repair so as to minimize deterioration of effluent
				  quality and insure rapid process recovery upon return to normal operational
				  mode.
c) Unit Bypass and
				Wastewater Pumpage During Construction
Final plans and specifications for upgrading or expanding
				  existing treatment plants shall include construction scheduling of any unit
				  bypassing, and appropriate temporary wastewater pumpage acceptable to the
				  Agency to minimize temporary water quality degradation. Refer to Section
				  370.260.
d) Drains and Buoyancy Protection
1) Means shall be provided to dewater each
				unit. Pipes subject to clogging shall be provided with means for mechanical
				cleaning or flushing.
2) Due
				consideration should be given to the possible need for hydrostatic pressure
				relief devices to prevent flotation of structures.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart E - SEWAGE TREATMENT WORKS › Section 370.540 - Plant Outfalls

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Discharge Impact Control
The outfall sewer shall be designed to discharge to the
				  receiving stream in a manner acceptable to the Agency. Consideration should be
				  given in each case to the following:
1) Preference for free fall or submerged
				discharge at the site selected.
2)
				Utilization of cascade aeration of effluent discharge to increase dissolved
				oxygen.
3) Limited or complete
				across-stream dispersion as needed to protect aquatic life movement and growth
				in the immediate reaches of the receiving stream.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart E - SEWAGE TREATMENT WORKS › Section 370.550 - Essential Facilities

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Emergency Power or Pumping Facilities
1) All
				plants shall be provided with an alternate source of electric power or pumping
				capability to allow continuity of operation during power failures. Methods of
				providing power or pumping capability include:
A) The connection to at least 2 independent
				public utility sources such as substations. A power line from each substation
				into the treatment plant with capability for switchover to the second power
				source by plant operating personnel will be required.
B) Portable or in place internal combustion
				engine equipment which will generate electrical or mechanical energy. Refer to
				Section 370.136(d).
C) Portable
				pumping equipment when only emergency pumping is required. Refer to Section
				370.136(d).
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart E - SEWAGE TREATMENT WORKS › Section 370.560 - Safety

Current through Register Vol. 48, No. 28, July 12, 2024
a) Adequate
				provision shall be made to effectively protect the operator and visitors from
				hazards. The following shall be provided to fulfill the particular needs of
				each plant:
1) Enclosure of the plant site
				with a fence designed to discourage the entrance of unauthorized persons and
				animals.
2) Installation of hand
				rails and guards around all tanks, pits, stairwells, and other hazardous
				structures.
3) Provision of first
				aid equipment at marked locations.
4) Posting of "No Smoking" signs in hazardous
				areas.
5) Protective clothing and
				equipment such as air packs, goggles, gloves, hard hats, safety harnesses and
				hearing protection.
6) Provision of
				portable blower and sufficient hose.
7) Portable lighting equipment that complies
				with the National Electrical Code.
8) Appropriately placed warning signs for
				slippery areas, non-potable water fixtures, low head clearance areas, open
				service manhole, hazardous chemical storage areas, flammable fuel storage
				areas, etc.
9) Smoke and fire
				detectors, fire extinguishers, and appropriate waste receptacles.
10) Provisions for confined space entry in
				accordance with the requirements of the Occupational Safety and Health Act and
				any other applicable regulatory requirements.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart E - SEWAGE TREATMENT WORKS › Section 370.570 - Laboratory

Current through Register Vol. 48, No. 28, July 12, 2024
a) All treatment
				works shall include a laboratory for making the necessary analytical
				determinations and operating control tests, except for those plants utilizing
				only processes not requiring laboratory testing for plant control and
				satisfactory off-site laboratory provisions are made to meet the permit
				monitoring requirements. For plants where a fully equipped laboratory is not
				required, the requirements for utilities and equipment such as fume hoods may
				be reduced or omitted.
b) The
				laboratory shall have sufficient size, bench space, equipment and supplies to
				perform all self-monitoring analytical work required by discharge permits, and
				to perform the process control tests necessary for good management of each
				treatment process included in the design.
c) The facilities and supplies necessary to
				perform analytical work to support industrial waste control programs will
				normally be included in the same laboratory. The laboratory size and
				arrangement must be sufficiently flexible and adaptable to accomplish these
				assignments. The layout should consider future needs for expansion in the event
				that more analytical work is needed.
d) Location and Space
1) The laboratory should be located on ground
				level, easily accessible to all sampling points, with environmental control as
				an important consideration. It shall be located in a separate room or building
				away from vibrating machinery or equipment which might have adverse effects on
				the performance of laboratory instruments or the analyst, or shall be designed
				to prevent structural transmission of machine vibration. The floor and wall
				construction shall be designed to keep out machine noise (blowers, pumps,
				etc.). The following minimum conditions shall be met:
A) Blowers, pumps, etc., must be located on a
				separate floor pad.
B) Common walls
				between machinery rooms must be double-walled with sound insulation between the
				walls. Connecting doors or windows to machinery rooms are not
				acceptable.
C) Common attic space
				shall be blocked off and effective sound proof material provided in the
				ceiling.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart F - PRELIMINARY TREATMENT › Section 370.600 - General Considerations

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Safety
Safety Features Relative to Location
1) Railings and Gratings
A) Manually cleaned channels shall be
				protected by guard railings and deck gratings, with adequate provisions for
				removal or opening to facilitate raking.
B) Mechanically cleaned channels shall be
				protected by guard railings and deck gratings. Consideration should also be
				given to temporary access arrangements to facilitate maintenance and
				repair.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart F - PRELIMINARY TREATMENT › Section 370.610 - Screening Devices

Current through Register Vol. 48, No. 28, July 12, 2024
a) Bar
				Racks and Screens
1) Where Required
Screening of raw sewage shall be provided at all mechanical
				  treatment works. For lift station applications, see Subpart D.
2) Design and Installation
A) Manually Cleaned Screens
Clear openings for manually cleaned screens between bars
				  should be from 1 to 1 3/4 inches. Design and installation shall be such that
				  they can be conveniently cleaned. An accessible platform shall be provided on
				  which the operator may rake screenings easily and safely. Suitable drainage
				  facilities with return flow to process shall be provided for the
				  platform.
B) Mechanical
				Screens
Clear openings for mechanically cleaned screens may be as
				  small as practical to assure the proper operation and maintenance of treatment
				  facilities. Mechanical screens shall be located so as to be protected from
				  freezing and to facilitate maintenance.
C) Velocities Through Screens
For manually or mechanically raked bar screens the maximum
				  velocities during peak flow periods should not exceed 2.5 feet per second. The
				  velocity shall be calculated from a vertical projection of the screen openings
				  on the cross-sectional area between the invert of the channel and the flow
				  line. Excessive head loss through the screen, which may affect upstream flow
				  measurement or bypassing, shall be taken into account.
D) Invert
The screen channel invert shall be at least 3 inches below
				  the invert of the incoming sewers. To prevent jetting action, the length and/or
				  construction of the screen channel shall be adequate to reestablish hydraulic
				  flow pattern following the drop in elevation.
E) Slope
Manually cleaned screens should be placed on a slope of 30 to
				  45 degrees with the horizontal.
3) Control Systems
A) Timing Devices
All mechanical units which are operated by timing devices
				  should be provided with auxiliary controls which will set the cleaning
				  mechanism in operation at predetermined high water marks.
B) Manual Override
Automatic controls shall be supplemented by a manual
				  override.
C) Electrical
				Fixtures and Controls
Electrical fixtures and controls in enclosed places where gas
				  may accumulate shall comply with the National Electrical Code requirements for
				  Class I, Group D, Division I locations.
4) Disposal of Screenings
A) Amply-sized, vector-proof facilities shall
				be provided for removal, handling and storage of screenings in a sanitary
				manner. Suitable drainage facilities shall be provided for the storage areas
				with drainage returned to process. The return of ground screenings to the
				sewage flow is unacceptable.
B)
				Disposal shall be in accordance with 35 Ill. Adm. Code 700 and shall be
				discussed in the plan documents.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart F - PRELIMINARY TREATMENT › Section 370.620 - Grit Removal Facilities

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Where Required
Grit removal facilities should be provided for all sewage
				  treatment plants and are required for plants receiving sewage from combined
				  sewers or from sewer systems receiving substantial amounts of grit. If a plant
				  serving a separate sewer system is designed without grit removal facilities,
				  the design shall include provision for future installation. Consideration shall
				  be given to possible damaging effects on pumps, and other preceding equipment,
				  and the need for additional storage capacity in treatment units where grit is
				  likely to accumulate.
b)
				Location
Grit removal facilities should be located ahead of pumps. In
				  such cases, coarse bar racks should be placed ahead of mechanically cleaned
				  grit removal facilities. Comminution equipment, when used, shall be located
				  downstream of the grit facility in order to reduce the operation and
				  maintenance problems associated with grit.
c) Type and number of units
1) The selection of the type of grit removal
				shall be based on necessary flexibility of velocity control to remove the
				selected size grit particulates through the range of expected plant flows, the
				volume of grit expected, and available area and hydraulic gradient limits at
				the site. Aerated or area type grit removal units equipped with adequate
				controls for operational flexibility are recommended where flow rates and grit
				characteristics and volume are expected to vary widely.
2) Plants treating wastes from combined
				sewers shall have at least one, preferably two or more, mechanically cleaned
				grit removal units, with provision for unit bypassing. A single manually
				cleaned or mechanically cleaned grit chamber with unit bypass is acceptable for
				small sewage treatment plants serving separate sanitary sewer systems. Minimum
				facilities for larger plants serving separate sanitary sewers shall be at least
				one mechanically cleaned unit with a unit bypass.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart G - SETTLING › Section 370.700 - General Considerations

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Number of Units
Multiple units capable of independent operation are desirable
				  and shall be provided in all plants where design average flows exceed 100,000
				  gallons per day. Plants not having multiple units shall include other
				  provisions to assure continuity of treatment.
b) Arrangement
Settling tanks shall be arranged in accordance with Sections
				  370.520(e)
				  and
				  370.710(g).
c) Flow Distribution
Effective flow splitting devices and control appurtenances
				  shall be provided to insure proper organic and hydraulic proportion of flow to
				  each unit. Refer to Section
				  370.520(f).
d) Tank Configuration
Consideration should be given to the probable flow pattern in
				  the selection of tank size and shape, and inlet and outlet type and
				  location.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart G - SETTLING › Section 370.710 - Design Considerations

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Dimensions
The minimum length of flow from inlet to outlet should be 10
				  feet unless special provisions are made to prevent short circuiting. The
				  sidewater depth for primary clarifiers shall be as shallow as practicable, but
				  not less than 7 feet. Clarifiers following the activated sludge process shall
				  have sidewater depths of at least 12 feet to provide adequate separation zone
				  between the sludge blanket and the overflow weirs. Clarifiers following fixed
				  film reactors shall have sidewater depth of at least 7 feet.
b) Surface Settling Rates (Overflow Rates)
The hydraulic design of settling tanks shall be based on the
				  anticipated peak hourly flow.
1)
				Primary and Bypass Settling Tanks
A) Primary
				Settling
Some indication of BOD removals may be obtained by reference
				  to Appendix E, Figure No. 2. The figure should not be used to design units
				  which receive wastewaters which have BOD and total suspended solids
				  concentrations which are substantially different from normal domestic sewage.
				  The operating characteristics of such units should be established by
				  appropriate field and laboratory tests. If activated sludge is wasted to the
				  primary settling unit, then the design surface settling rate shall not exceed
				  1,000 gallons per day per square foot based on design peak hourly flow,
				  including all flows to the unit. Refer to subsection (b)(3) and Section
				  370.820.
B) Combined Sewer Overflow and
				Bypass Settling
The maximum surface settling rate shall not exceed 1,800
				  gallons per day per square foot based on peak hourly flow. Minimum liquid depth
				  shall not be less than 10 feet. Minimum detention shall not be less than one
				  hour. The minimum length of flow from inlet baffle to outlet should be 10 feet,
				  unless special provisions are made to prevent short-circuiting.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart G - SETTLING › Section 370.720 - Sludge and Scum Removal

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Scum Removal
Full surface mechanical scum collection and removal
				  facilities, including baffling, shall be provided for all settling tanks,
				  except for Imhoff tanks. The unusual characteristics of scum which may
				  adversely affect pumping, piping, sludge handling and disposal, should be
				  recognized in design. Provisions may be made for the discharge of scum with the
				  sludge; however, other special provisions for disposal may be necessary. Refer
				  to Section
				  370.710(g).
b) Sludge Removal
Mechanical sludge collection and withdrawal facilities shall
				  be designed to assure an effective and controlled rate of removal of the
				  sludge. Suction withdrawal is encouraged.
1) Sludge Hopper
The minimum slope of the side walls shall be 1.7 vertical to
				  1 horizontal. Hopper wall surfaces should be made smooth with rounded corners
				  to aid in sludge removal. Hopper bottoms shall have a maximum dimension of 2
				  feet. Extra depth sludge hoppers for sludge thickening are not
				  acceptable.
2)
				Cross-Collectors
Cross-collectors serving one or more settling tanks may be
				  useful in place of multiple sludge hoppers.
3) Sludge Removal Piping
Each hopper shall have an individually valved sludge
				  withdrawal line at least 6 inches in diameter. The static head available for
				  withdrawal of sludge shall be 30 inches or greater, as necessary to maintain a
				  3 feet per second velocity in the withdrawal pipe. Clearance between the end of
				  the withdrawal line and the hopper walls shall be sufficient to prevent
				  "bridging" of the sludge. Adequate provisions shall be made for rodding or
				  back-flushing individual pipe runs. Piping shall also be provided to return
				  waste sludge from secondary and tertiary processes to primary clarifiers where
				  they are used. Refer to Section
				  370.820.
4) Sludge Removal Control
Sludge wells equipped with telescoping valves or swing pipes
				  are recommended for primary sludge and fixed film sludges where periodic
				  withdrawal is proposed. Air lift type of sludge removal will not be approved
				  for removal of primary sludges.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart G - SETTLING › Section 370.730 - Protection and Service Facilities

Current through Register Vol. 48, No. 28, July 12, 2024
a) Operator Protection
All settling tanks shall be equipped to enhance safety for
				  operators. Such features shall appropriately include machinery covers, life
				  lines, stairways, walkways, handrails and slip-resistant surfaces. If sidewalls
				  are extended more than three feet above the liquid level or four feet above
				  ground level, convenient walkways must be provided to facilitate housekeeping
				  and maintenance.
b)
				Mechanical Maintenance Access
The design shall provide for convenient and safe access to
				  routine maintenance items such as gear boxes, scum removal mechanisms, baffles,
				  weirs, inlet stilling baffle area, and effluent channels.
c) Electrical Fixtures and Controls
Electrical fixtures and controls in enclosed settling basins
				  shall meet the requirements of the National Electric Code for Class I, Group D,
				  Division 1 locations. The fixtures and controls shall be located so as to
				  provide convenient and safe access for operation and maintenance. Adequate area
				  lighting shall be provided.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart G - SETTLING › Section 370.740 - Imhoff Tanks

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
Imhoff tanks may be used for the sedimentation of settleable
				  solids and for the unheated anaerobic digestion of these solids.
b) Settling Compartment Design
1) Settling Rate
Surface settling rate shall not exceed 1000 gallons per day
				  per square foot based upon design peak hourly flow.
2) Detention Period
A detention period of not less than 1 hour based upon design
				  peak hourly flow shall be provided.
3) Dimensions
The minimum length of flow between inlet and outlet should be
				  10 feet and at least 6 feet of settling depth should be provided.
4) Freeboard
The freeboard shall be 18 inches or more.
5) Hopper Slope
The bottom of the settling chamber of the conventional tank
				  shall have a slope of at least 1.4 vertical to 1.0 horizontal. The slot at the
				  bottom of the settling chamber allowing solids passage shall have a minimum
				  opening and a minimum overlap of 6 inches.
6) Inlets and Outlets
Inlet and outlet arrangements should be designed so that the
				  direction of flow may be reversed to allow for a more even distribution of
				  solids in the digestion compartment. Adequate scum baffles shall be provided at
				  the ends of the flow-through chamber.
7) Weirs
Weir design and overflow rates shall be in accordance with
				  Section
				  370.710(d).
8) Walkway
A walkway along the length of the tank shall be
				  provided.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart G - SETTLING › Section 370.750 - Septic Tank - Tile System

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
Septic tank tile systems shall be used only for domestic or
				  similar organic waste, where soil conditions are suitable and sewers tributary
				  to treatment works are not available.
b) Design Standards
Specific design information is contained in the document
				  titled "Private Sewage Disposal Licensing Act & Code", which can be
				  obtained from:
State of Illinois
Department of Public Health
Springfield, Illinois 62706.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.800 - General

Current through Register Vol. 48, No. 28, July 12, 2024
Facilities for processing sludge shall be provided at all
				  mechanical sewage treatment plants. Handling equipment shall be capable of
				  processing sludge to a form suitable for ultimate disposal.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.810 - Process Selection

Current through Register Vol. 48, No. 28, July 12, 2024
The selection of sludge handling unit processes should be
				  based upon at least the following considerations:
a) Local land use.
b) System energy requirements.
c) Cost effectiveness of sludge thickening
				and dewatering.
d) Equipment
				complexity and staffing requirements.
e) Adverse effects of heavy metals and other
				sludge components upon the unit processes.
f) Sludge digestion or stabilization
				requirements.
g) Side stream or
				return flow treatment requirements (e.g., digester or sludge storage facilities
				supernatant, dewatering unit filtrate, wet oxidation return flows).
h) Sludge storage requirements.
i) Methods of ultimate disposal.
j) Back-up techniques of sludge handling and
				disposal.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.820 - Sludge Thickening

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Sludge thickeners to reduce the volume of sludge should be considered. The
				design of thickeners (gravity tank, gravity belt, dissolved-air flotation,
				centrifuge, and others) should take into account the type and concentration of
				sludge, the sludge stabilization processes, storage requirements, the method of
				ultimate sludge disposal, chemical needs, and the cost of operation. The use of
				gravity thickening tanks for unstabilized sludges is not recommended because of
				problems due to septicity unless provisions are made for adequate control of
				process operational problems as well as problems of odors at the gravity
				thickener and any following unit processes. Particular attention should be
				given to the pumping and piping of the concentrated sludge and possible onset
				of anaerobic conditions.
b) Process
				selection and unit process design parameters should be based on prototype
				studies. The Agency will require such studies where the sizing of other plant
				units is dependent on performance of the thickeners. Refer to Section
				370.520(b)
				for any new process determination.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.830 - Anaerobic Sludge Digestion

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
1) Multiple Units
Multiple units or alternate methods of sludge processing
				  shall be provided. Facilities for sludge storage and supernatant separation in
				  an additional unit may be required, depending on raw sludge concentration and
				  disposal methods for sludge and supernatant.
2) Depth
If process design provides for supernatant withdrawal, the
				  proportion of depth to diameter should be such as to allow for the formation of
				  a reasonable depth of supernatant liquor. A minimum side water depth of 20 feet
				  is recommended.
3) Design
				Maintenance Provisions
To facilitate emptying, cleaning, and maintenance the
				  following features are desirable:
A)
				Slope
The tank bottom shall slope to drain toward the withdrawal
				  pipe. For tanks equipped with a suction mechanism for sludge withdrawal, a
				  bottom slope not less than 1 to 12 is recommended. Where the sludge is to be
				  removed by gravity alone, 1 to 4 slope is recommended.
B) Access Manholes
At least 2 access manholes should be provided in the top of
				  the tank in addition to the gas dome. There should be stairways to reach the
				  access manholes. A separate side wall manhole shall be provided that is large
				  enough to permit the use of mechanical equipment to remove grit and sand. The
				  side wall access manhole should be low enough to facilitate heavy equipment
				  handling and may be buried in the earthen bank insulation.
C) Safety
Non-sparking tools, rubber-soled shoes, safety harness, gas
				  detectors for inflammable and toxic gases, and at least two self-contained
				  breathing units shall be provided for emergency use.
4) Toxic Materials
If the anaerobic digestion process is proposed, the basis of
				  design shall be supported by wastewater analyses to determine the presence of
				  undesirable materials, such as high concentrations of sulfates and inhibitory
				  concentrations of heavy metals.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.840 - Aerobic Sludge Digestion

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
The aerobic sludge digestion system shall include provisions
				  for digestion, supernatant separation, sludge concentration and any necessary
				  sludge storage. These may be accomplished with separate tanks or processes or
				  in digestion tanks.
b)
				Multiple Units
Multiple digestion units capable of independent operation are
				  recommended for all plants and shall be provided in those plants where the
				  design average flow exceeds 100,000 gallons per day. Plants without multiple
				  units shall provide alternate sludge handling and disposal methods.
c) Tank Capacity
1) The following digestion tank capacities
				are based on a solids concentration of 2 percent with supernatant separation
				performed in a separate tank. If supernatant separation is performed in the
				digestion tank, a minimum of 25 percent additional volume is required. These
				capacities shall be provided unless sludge thickening facilities (refer to
				Section
				370.820 ) are
				utilized to thicken the feed solids concentration to greater than 2 percent. If
				such. thickening is provided, the digestion volumes may be decreased
				proportionally.
(ft.(3)/Population
Sludge Source
Equivalent (P.E.))
Waste activated sludge-no primary settling
4.5 *
Primary plus waste activated sludge
.0*
Waste activated sludge exclusive of primary
							 sludge
.0*
Extended aeration activated sludge
.0
Primary plus fixed film reactor sludges
.0
*These volumes apply to waste activated sludge from single
				  stage nitrification facilities with less than 24 hours detention time based on
				  design average flow.
2)
				These volumes are based on digester temperatures of 59~ F (15~ C) and a solids
				retention time of 27 days. Aerobic digesters shall be covered to minimize heat
				loss or these volumes shall be increased for colder temperature applications.
				Refer to subsection (g) below for necessary sludge storage. Additional volume
				may be required if the land application disposal method is used in order to
				meet applicable Federal regulations.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.845 - High pH Stabilization

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
Alkaline material may be added to liquid primary or secondary
				  sludges for sludge stabilization in lieu of digestion facilities, to supplement
				  existing digestion facilities, or for interim sludge handling. Inasmuch as the
				  high pH stabilization process does not reduce organic matter but rather
				  increases the mass of dry sludge solids, so that additional volumes of sludge
				  will be generated in the absence of supplemental dewatering, the design shall
				  account for the increased sludge quantities for storage and handling,
				  transportation and disposal methods and associated costs. Alkaline material may
				  be added to dewatered sludges for stabilization pursuant to Section
				  370.520(b).
b) Operational Criteria
Sufficient alkaline material shall be added to liquid sludge
				  in order to produce a homogeneous mixture with a minimum pH of 12 after 2 hours
				  of vigorous mixing. Facilities for adding supplemental alkaline material shall
				  be provided to maintain the pH of the sludge during interim sludge storage
				  periods.
c) Odor Control
				and Ventilation
Odor control facilities shall be provided for sludge mixing
				  and treated sludge storage tanks that are located within 1/2 mile of
				  residential or commercial areas. Indoor sludge mixing, storage and processing
				  facilities shall have ventilation that meets the ventilation requirements
				  contained in Section 370.410(g)(1-4) and (6) and shall comply with the safety
				  precautions contained in Section
				  370.560.
				  Adequate facilities shall be provided to condition the exhaust air to meet the
				  applicable substantive and permitting requirements of 35 Ill. Adm. Code
				  Subtitle B: Air Pollution.
d) Mixing Tanks and Equipment
1) Tanks
Mixing tanks may be designed to operate as either a batch or
				  continuous flow process. A minimum of two tanks of adequate size to provide a
				  minimum of 2 hours of contact time in each tank shall be provided. The
				  following factors shall also be taken into account in determining the number
				  and size of tanks:
A) Peak sludge flow
				rates;
B) Storage between
				batches;
C) Dewatering or
				thickening performed in tanks;
D)
				Repeating sludge treatment due to pH decay of stored sludge;
E) Sludge thickening prior to sludge
				treatment;
F) Type of mixing device
				used and associated maintenance and repair requirements.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.850 - Sludge Pumps and Piping

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Sludge Pumps
1) Capacity
Pump capacities shall be adequate but not excessive.
				  Provision for varying pump capacity is desirable. A rational basis of design
				  shall be provided with the plan documents.
2) Duplicate Units
Duplicate units shall be provided at all
				  installations.
3) Type
Plunger pumps, screw feed pumps or other types of pumps with
				  demonstrated solids handling capability shall be provided for handling raw
				  sludge. Where centrifugal pumps are used, a parallel positive displacement pump
				  shall be provided as an alternate to pump heavy sludge concentrations, such as
				  primary or thickened sludges, that may exceed the pumping head of the
				  centrifugal pump.
4)
				Minimum Head
A minimum positive head of 24 inches shall be provided at the
				  suction side of centrifugal type pumps and is desirable for all types of sludge
				  pumps. Maximum suction lifts should not exceed 10 feet for plunger
				  pumps.
5) Sampling
				Facilities
Unless sludge sampling facilities are otherwise provided,
				  quick closing sampling valves shall be installed at the sludge pumps. The size
				  of valve and piping should be at least 11/2 inches and terminate at a suitably
				  sized sampling sink or floor drain.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.860 - Sludge Dewatering

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
On-site sludge dewatering facilities shall be provided for
				  all plants, although the following requirements may be reduced or omitted, if
				  justified, with on-site liquid sludge storage facilities or approved off-site
				  sludge disposal.
1) Anaerobic
				Digestion Sludge Production
For purposes of calculating sludge handling and disposal
				  needs, sludge production values from a two-stage anaerobic digestion process
				  shall be based on a maximum solids concentration of 5% without additional
				  thickening. The solids production values, calculated on a dry weight basis,
				  shall be based on the following values for the listed processes:
A) Primary plus waste activated sludge - at
				least 0.12 lbs/P.E./day;
B) Primary
				plus fixed film reactor sludge - at least 0.09 lbs/P.E./day.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart H - SLUDGE PROCESSING AND DISPOSAL › Section 370.870 - Sludge Storage and Disposal

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Storage
1) General
Sludge storage facilities shall be provided at all mechanical
				  treatment plants, and may consist of any combination of drying beds, lagoons,
				  separate tanks, additional volume in stabilization units, pad areas or other
				  means to store either liquid or dried sludge. Drainage of supernatant from
				  sludge storage facilities shall be returned to the sewage treatment process at
				  appropriate points and rates. Refer to Section
				  370.860(b) and
				  (c) for drying bed and lagoon design
				  criteria, respectively.
2)
				Volume
Rational calculations justifying the number of days of
				  storage based on the total sludge handling and disposal system shall be
				  submitted. Refer to Sections
				  370.840(g)
				  and
				  370.860(a)
				  for anaerobicly and aerobicly digested sludge production values; values for
				  other stabilization processes shall be justified on the basis of design. If
				  land application is the only means of sludge disposal used at a treatment
				  plant, a minimum of 150 days storage shall be provided, in order to account for
				  inclement weather and cropping practices.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart I - BIOLOGICAL TREATMENT › Section 370.900 - Trickling Filters

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
1) Applicability
Trickling filters may be used for treatment of sewage
				  amenable to treatment by aerobic biologic processes. Trickling filters shall be
				  preceded by settling tanks equipped with scum and grease collecting devices, or
				  other suitable pretreatment facilities.
2) Design Basis
Filters shall be designed so as to provide the required
				  reduction in biochemical oxygen demand, ammonia nitrogen, or to properly
				  condition the sewage for subsequent treatment processes.
3) Multiple Units
Multiple trickling filter units capable of independent
				  operation are recommended for all plants and must be provided for those plants
				  where the design average flow exceeds 100,000 gallons per day. Plants not
				  having multiple units shall include other provisions to assure continuity of
				  treatment.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart I - BIOLOGICAL TREATMENT › Section 370.915 - Rotating Biological Contactors

Current through Register Vol. 48, No. 28, July 12, 2024
a) General
Wastewater treatment facilities that propose to use rotating
				  biological contactors (RBCs) shall submit to the Agency for review field
				  experience and operational data that demonstrates that observed problems with
				  the process have been solved at similar full scale installations. The Agency
				  will review the claimed field experience against known field conditions and the
				  operational history of observed problems at similar facilities.
b) Mechanical Reliability and
				Structural Integrity
1) The mechanical and
				structural reliability of the shafts and media subjected to cyclic stress
				reversals must be demonstrated relative to the design life of the plant and the
				known weight of the machines based on field experience.
2) The design must show that film thickness
				will be effectively controlled throughout all parts of the media pack to
				prevent excessive film weight and water pickup weight due to plugging
				restrictions. The equipment design must include load cells to warn of the need
				for film thickness control and to demonstrate the effectiveness of the proposed
				film thickness control practices.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart I - BIOLOGICAL TREATMENT › Section 370.920 - Activated Sludge

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				General
1) Applicability
A) Biodegradable Wastes
The activated sludge process, and its various modifications,
				  may be used to treat wastewater which is amenable to biological treatment.
				  Approval of new activated sludge plants shall be limited to those plants where
				  the design average flow capacity exceeds 0.25 mgd.
B) Operation Control Requirements
The activated sludge process requires close attention and
				  competent operating supervision. Facilities and appurtenances for routine
				  control and control tests shall be provided at all activated sludge plants.
				  These requirements shall be considered when proposing this type of
				  treatment.
C) Energy
				Requirements
This process requires major energy usage to meet aeration
				  demands. Energy costs and potential mandatory emergency public power reduction
				  events, in relation to critical water quality conditions, must be carefully
				  evaluated. Capability of energy usage phasedown while still maintaining process
				  viability, both under normal and emergency energy availability conditions, must
				  be included in the activated sludge design.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart I - BIOLOGICAL TREATMENT › Section 370.930 - Waste Stabilization Ponds and Aerated Lagoons

Current through Register Vol. 48, No. 28, July 12, 2024
a) Supplement To Engineer's Report
1) The engineer's report shall contain
				pertinent information on location, geology, soil conditions, area for
				expansion, and any other factors that will affect the feasibility and
				acceptability of the proposed treatment.
2) Supplementary Field Survey Data
The following information must be submitted in addition to
				  that required in Section 370.111:
A)
				The location and direction of all residences, commercial development, and water
				supplies within 1/2 mile of the proposed pond.
B) Soil borings to determine surface and
				subsurface soil characteristics of the immediate area and their effect on the
				construction and operation of a pond located on the site.
C) Data demonstrating anticipated percolation
				rates at the elevation of the proposed pond bottom.
D) A description, including maps showing
				elevations and contours of the site and adjacent area suitable for
				expansion.
E) Sulfate content of
				the water supply.
F) Identification
				of the location, depth and discharge point of any field tile in the immediate
				area of the proposed site.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart I - BIOLOGICAL TREATMENT › Section 370.940 - Intermittent Sand Filtration for Secondary Treatment

Current through Register Vol. 48, No. 28, July 12, 2024
a) Applicability
Use of the intermittent sand filter for secondary treatment
				  is generally limited to weak to normal strength wastewaters which are amenable
				  to biological treatment. Cold weather operational problems may preclude the use
				  of this process unless the influent temperature to the filter is adequate to
				  allow efficient filter operation necessary to meet the applicable effluent
				  standards.
b) Pretreatment
				Requirements
Wastewaters applied to intermittent sand filters must be
				  substantially free of grit, debris, oil and grease, floating and suspended
				  materials, and components which inhibit biological processes and cause rapid
				  clogging of the filter. Special consideration shall be given to the design of
				  preceding treatment units, including dosing facilities, to limit heat loss
				  during winter operation.
c)
				Multiple Units
Intermittent sand filters shall be provided in multiple
				  units, designed for independent operation and maintenance.
d) Location
Intermittent sand filters treating septic tank or primary
				  effluent should be restricted to relatively isolated locations or otherwise
				  modified in order to minimize odor nuisances.
e) Recirculation
Recirculation of filter effluent may be practiced in order to
				  attenuate and equalize organic and hydraulic loads to the filter, and improve
				  unit process efficiency, control odors, and improve day-to-day
				  reliability.
1) Rate
A recirculation rate of up to 300% of the settled sewage load
				  to the filter may be provided.
2) Variability
The capability of varying the recirculation rate allows
				  greater process control and optimization of process efficiency. This feature
				  shall be included where recirculation is provided.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart J - DISINFECTION › Section 370.1000 - General

Current through Register Vol. 48, No. 28, July 12, 2024
Where needed to meet applicable standards, disinfection of
				  the effluent shall be provided. The design shall provide for meeting both the
				  bacterial standards and any disinfectant residual limits applicable to the
				  effluent.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart J - DISINFECTION › Section 370.1010 - Disinfection Process Selection

Current through Register Vol. 48, No. 28, July 12, 2024
a) The disinfection process should be
				selected after due consideration of waste characteristics, type of treatment
				processes provided prior to disinfection, waste flow rates, waste pH,
				disinfectant demand rates, current technology application, cost of equipment,
				chemical availability, power costs and maintenance requirements. Areawide
				public safety shall be considered where large liquid chlorine or sulfur dioxide
				containers are to be handled.
b)
				Chlorine may be used in the form of liquid chlorine or calcium or sodium
				hypochlorite. Dechlorination will be required where necessary to meet
				applicable chlorine residual effluent limitations.
c) An ultra-violet radiation system may be
				used as an alternative disinfection process.
d) Other alternative means of disinfection
				will be evaluated according to the provisions of Section
				370.520(b).
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart J - DISINFECTION › Section 370.1020 - Chlorine Disinfection

Current through Register Vol. 48, No. 28, July 12, 2024
a)
				Type of Feed Equipment
The types of chlorine feed equipment include:
1) Vacuum solution feed by gas;
2) Direct gas feed;
3) Hypochlorite solution positive
				displacement pump feed;
4)
				Hypochlorite tablet feed.
Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 370 - ILLINOIS RECOMMENDED STANDARDS FOR SEWAGE WORKS › Subpart J - DISINFECTION › Section 370.1021 - Dechlorination

Current through Register Vol. 48, No. 28, July 12, 2024
a) General
Dechlorination of sewage plant effluents may be required to
				  reduce toxicity due to chlorine residuals.
b) Feed Equipment
1) Type
The common types of dechlorination feed equipment using
				  sulfur compounds include:
A) Vacuum
				solution feed of sulfur dioxide gas.
B) Positive displacement pump feed or aqueous
				solutions of sulfite or bisulfite products.