Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 317 - DESIGN CRITERIA PRIOR TO 2008 › Section 317.6 - Disinfection

Current through Reg. 49, No. 28; July 12, 2024
(a) General policy.
				Facilities for disinfection shall be provided to protect the public health and
				as an aid to plant operation.
(b)
				Chlorination facilities.
(1) Chlorination
				equipment. Chlorination equipment shall be selected and installed which is
				capable of applying desired amounts of chlorine continuously to the effluent.
				Chlorination equipment may also be installed to control odors and generally
				assist treatment. To accomplish these objectives, points of chlorine
				application may be established at the head of the plant for prechlorination, in
				the effluent chlorine contact chamber, or other suitable locations.
(A) Capacity. Chlorination equipment shall
				have a capacity greater than the highest expected dosage to be applied.
				Chlorination systems shall be capable of operating under all design hydraulic
				conditions. Duplicate equipment with automatic switchover should be considered
				for standby service, so that continuous chlorination can be provided.
(B) Controls. Means for automatic
				proportioning of the chlorine amount to be applied in accordance with the rate
				of effluent being treated is encouraged for all plants and may be required if a
				maximum chlorine residual is required in the applicable discharge permit.
				Manual control will be permitted where the rate of effluent flow is relatively
				constant and for prechlorination applications. Consideration shall also be
				given to controlling chlorine feed by use of demand.
(C) Measurements. A scale for determining the
				amount of chlorine used daily, as well as the amount of chlorine remaining in
				the container, shall be provided.
(D) Safety equipment. Self-contained
				breathing apparatus shall be available for use by plant personnel. The
				equipment should be located at a safe distance from the chlorine facilities to
				insure accessibility. Self-contained breathing apparatus shall be located
				outside the entrance to the chlorine facility.
(E) Housing. Housing of chlorination
				equipment and cylinders of chlorine shall be in separate rooms above ground
				level, with the door opening to the outside, as a measure of safety. Doors
				should be equipped with panic hardware. The chlorination room should be
				separated from other rooms by gas-tight partitions and should be equipped with
				a clear glass, gas-tight window which permits the chlorinator to be viewed
				without entering the room. Forced mechanical ventilation shall be included in
				chlorination rooms which will provide a complete air change a minimum of every
				three minutes. The exhaust equipment should be automatically activated by
				external light switches and gas detectors that are provided with contact
				closures or relays. No other equipment shall be installed or stored in the
				chlorinator room. Vents from chlorinators, vaporizers, and pressure reducing
				values should be piped to the outdoors at a point not frequented by personnel,
				nor near a fresh air intake. Detectors and alarms should be located in each
				area containing chlorine gas under pressure. If gas withdrawal chlorine storage
				cylinders are subjected to direct sun, pressure reducing devices must be
				provided at the cylinders. Fire protection devices and fireproof construction
				is required for all chlorine storage areas. Electrical controls in chlorine
				facilities must be replaceable or protected against corrosion. Separate,
				trapless floor drains or a drain to an ample dilution point shall be provided
				from the chlorine storage room and from liquid feed chlorinator
				rooms.
(F) Emergency chlorination.
				Emergency power should be provided for chlorination facilities.
(G) Other. Chlorine rooms shall maintain a
				minimum temperature of 65 degrees Fahrenheit. Chlorinate solution should be
				prepared using treated effluent. If potable water is used, the potable water
				supply system must be protected by an adequate backflow prevention device. When
				a booster pump is required, duplicate equipment should be provided.