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