Nebraska Administrative Code › Topic - ENVIRONMENT AND ENERGY › Title 197 - RULES AND REGULATIONS FOR THE CERTIFICATION OF WASTEWATER TREATMENT OPERATORS › Appendix A - Municipal/Commercial Wastewater Treatment Plant Point Rating System Wastewater Treatment Plant Point Rating System (Non-Industrial/Municipal)

Current through June 17, 2024
A wastewater system with only collection, lift stations, and
	 chlorination is considered a collection system and not a wastewater treatment
	 plant. Each unit process should will have points assigned only once.
Item
Points
Your Plant
Size (2 point minimum to 20 point
				  maximum)
Maximum population equivalent (PE) or part served, peak day
				  (1 point minimum to 10 point maximum)
1 pt per
10,000 or part
Design flow average day or peak month's part flow average
				  day, whichever is larger (1 point minimum to 10 point maximum)
1 pt per MGD or part
Variation in raw waste (0 point minimum to 6 point
				  maximum)1
Variations do not exceed those normally or typically
				  expected
0
Recurring deviations or excessive variations of 100 to 200%
				  in strength and/or flow
2
Recurring deviations or excessive variations of more than
				  200% in strength and/or flow
4
Raw wastes subject to toxic waste discharges
6
Impact of septage or truck-hauled waste (0 point minimum to 4
				  point maximum)
Preliminary treatment
Plant pumping of main flow
3
Screening, comminution
3
Grit removal
3
Equalization
1
Primary Treatment
Clarifiers
5
Imhoff tanks or similar
5
Secondary Treatment
Fixed-film reactor
10
Activated sludge
15
Stabilization ponds without aeration
5
Stabilization ponds with aeration
8
Tertiary Treatment
Polishing ponds for advanced waste treatment
2
Chemical/physical advanced waste treatment w/o
				  secondary
15
Chemical/physical advanced waste treatment following
				  secondary
10
Biological or chemical/biological advanced waste
				  treatment
12
Nitrification by designed extended aeration only
2
Ion exchange for advanced waste treatment
10
Reverse osmosis, electrodialysis and other membrane
				  filtration techniques
15
Advanced waste treatment chemical recovery, carbon
				  regeneration
4
Media filtration
5
Additional Treatment Processes
Chemical additions (2 points each for a maximum of 6
				  points)
6
Dissolved air flotation (for other than sludge
				  thickening)
8
Intermittent sand filter
2
Recirculating intermittent sand filter
3
Microscreens
5
Generation of oxygen
5
Solids Handling
Solids stabilization
5
Gravity thickening
2
Mechanical dewatering
8
Anaerobic digestion of solids
10
Utilization of digester gas for heating or
				  cogeneration
5
Aerobic digestion of solids
6
Evaporative sludge drying
2
Solids reduction (including incineration, wet
				  oxidation)
12
On-site landfill for solids
2
Solids composting
10
Land application of biosolids by contractor
2
Land application of biosolids under direction of facility
				  operator in direct responsible charge
10
Disinfection (0 point minimum to 10 point
				  maximum)
Chlorination or ultraviolet irradiation
5
Ozonation
10
Effluent discharge (0 point minimum to 10 point
				  maximum)
Mechanical post aeration
2
Direct recycle and reuse
6
Land treatment and disposal (surface or subsurface)
4
Instrumentation (0 point minimum to 6 point
				  maximum)3
Use of SCADA or similar instrumentation systems to provide
				  data w/ no process operation
0
Use of SCADA or similar instrumentation systems to provide
				  data w/ limited process operation
2
Use of SCADA or similar instrumentation systems to provide
				  data w/ moderate process operation
4
Use of SCADA or similar instrumentation systems to provide
				  data w/ extensive or total process operation
6
Laboratory control (0 point minimum to 15 point
				  maximum)2
Bacteriological/biological (0 point minimum to 5 point
				  maximum)
..Lab work done outside the plant
0
..Membrane filter procedures
3
..Use of fermentation tubes or any dilution method; fecal
				  coliform determination
5
Chemical/physical (0 point minimum to 10 point
				  maximum)
I. Lab work done outside the plant
0
II. Push-button or visual methods for simple tests such as
				  pH, settleable solids
3
III. Additional procedures such as DO, COD, BOD, gas
				  analysis, titrations, solids, volatile content
5
IV. More advanced determinations such as specific
				  constituents; nutrients, total oils, phenols
7
V. Highly sophisticated instrumentation such as atomic
				  absorption, gas chromatography
10
Total Points
1 The key concept is frequency and/or intensity of deviation or
	 excessive variation from normal or typical fluctuations; such deviation can be
	 in terms of strength, toxicity, shock loads, I/I, with points from 0 to
	 6.
2 The key concept is to credit laboratory analyses done on-site by
	 plant personnel under the direction of the operator in direct responsible
	 charge with points from 0 to 15.
3. Supervisory Control and Data Acquisition (SCADA) system.