5 Colo. Code Regs. § 1003-2-100.5
Treatment Type1 | Plant Design Hydraulic Capacity (in MGD) | ||||
Below 0.5 | 0.5-1.00 | 1.01-2.00 | 2.01-4.00 | Above 4.00 | |
Preliminary Treatment | |||||
Coarse Solids Reduction (e.g., comminution, macerator, grinder) | D | D | C | C | B |
Screening with manually cleaned bar screen | |||||
Screening with mechanically cleaned screen, fine screen, | C | C | B | B | A |
Flow equalization, | |||||
Grit removal, | |||||
Plant pumping of main flow | |||||
Primary Treatment | |||||
Sedimentation basin (pond, septic tank) | D | C | C | C | B |
Primary Clarifier Oil and grease processing | C | C | B | B | A |
Dissolved air flotation (DAF) Chemically Enhanced Primary Clarification for settling improvements (coagulation, flocculation) | B | B | B | B | A |
Active Primary Clarification (e.g., anaerobic generation of volatile fatty acids) | B | B | A | A | A |
Secondary Treatment [Purpose to treat BOD, TSS to secondary limits.] | |||||
Recirculating sand filtration | D | C | C | C | C |
Waste stabilization ponds, including aerated and non- aerated types | D | C | C | B | B |
Trickling filter Rotating biological contactor | C | C | B | B | A |
Treatment wetland (surface flow, subsurface flow) or subsurface submerged bioreactor for BOD and/or suspended solids | C | C | B | B | A |
Extended aeration process sequencing batch reactors (SBR) designed to operate in the extended aeration loading range. | C | B | B | B | A |
Activated sludge (e.g., conventional, complete mix, contact stabilization, extended aeration, step-feed, oxidation ditch, non-extended aeration SBR) Fixed biofilm reactor (e.g., fixed activated sludge treatment or FAST) Submerged granular media biofilm Moving bed biofilm reactor (MBBR) | B | B | B | B | A |
Integrated biofilm and activated sludge (IFAS) Membrane bioreactor (MBR) Membrane aerated biofilm reactor (MABR) Anaerobic reactors (e.g., upflow sludge blanket, baffled reactor, multiple compartment reactors, sequencing batch reactor, fluidized bed reactor, membrane bioreactor, filter) | B | B | A | A | A |
Pure oxygen activated sludge | A | A | A | A | A |
Secondary Clarification | |||||
Secondary clarifiers (biofilm) | C | C | B | B | A |
Secondary clarifiers (suspended growth) | B | B | B | B | A |
Dissolved air flotation (DAF) | |||||
Ballasted enhanced settling | B | B | A | A | A |
Advanced Treatment [Purpose to treat beyond secondary limits both within secondary treatment units and/or physically separate processes after secondary treatment.] | |||||
Biological or Chemical/Biological Advanced Waste Treatment | |||||
Suspended growth (e.g., MLE, A2O, Bardenpho, membrane bioreactor (MBR), aerobic granular sludge, advanced biological algae treatment, etc.) | B | B | A | A | A |
Biofilm (e.g., trickling filter, rotating biological contactor, fixed biofilm reactors (FAST), moving bed biofilm reactors (MBBR), submerged granular media biofilm, integrated biofilm and activated sludge (IFAS), biologically active carbon, membrane aerated biofilm reactor (MABR), denitrification filters, etc.) | |||||
Anaerobic reactors (e.g., upflow sludge blanket, baffled reactor, multiple compartment reactors, sequencing batch reactor, fluidized bed reactor, membrane bioreactor, filter) | |||||
Phosphorus removal (e.g., biological, chemical, etc.). Not including struvite recovery - see solids handling. | |||||
Treatment wetland (e.g., surface flow, subsurface flow) or subsurface submerged bioreactor (e.g., for nitrogen, phosphorus, metals) | |||||
Deammonification | A | A | A | A | A |
Pure oxygen activated sludge | |||||
Chemical/Physical Advanced Waste Treatment [For unit treatment process and not solely an adjusting condition for an earlier biological process (e.g., pH, alkalinity, carbon feed).] | |||||
Air stripping | C | C | B | B | A |
Adsorptive media (granular activated carbon, Zeolite, organoclay) | B | B | A | A | A |
Low voltage electro-coagulation / electro-flocculation | |||||
Ion exchange | |||||
Electro-chemical (e.g., electrodialysis, electrolysis, electro-oxidation, high voltage electro-coagulation/flocculation) | Industrial operator | Industrial operator | Industrial operator | Industrial operator | Industrial operator |
Advanced oxidation and/or oxidation/reduction (e.g., hydrogen peroxide + UV, metal ox/reduction recovery) | |||||
Chemical precipitation (e.g., metal hydroxide precipitation, metal sulfide precipitation). Not including struvite recovery - see solids handling. | |||||
Filtration | |||||
Cloth filter, cartridge bag/filter | C | B | A | A | A |
Slow sand filtration | |||||
Upflow sand filtration (no chemical addition) | |||||
Coagulation, flocculation, sedimentation | B | B | A | A | A |
Media filtration (rapid sand, dual media) | |||||
Upflow sand filtration (with chemical addition) | |||||
Membrane filtration (microfiltration, ultrafiltration) | |||||
Diatomaceous earth (DE) | |||||
Membrane filtration (nanofiltration) | A | A | A | A | A |
Reverse osmosis | |||||
Disinfection / Inactivation | |||||
Free chlorine, contact basin (e.g., premade liquid solution, solid tablets, hypochlorination with liquid solution onsite generation from solid) | D | C | C | B | B |
Ultraviolet radiation (UV) | C | B | B | B | A |
Peracetic acid, contact basin | |||||
Free chlorine, contact basin (gaseous) | C | C | B | A | A |
Advanced oxidation, electro processes for disinfection | B | B | A | A | A |
Ozonation, contact basin | A | A | A | A | A |
Dechlorination | |||||
Solid materials (e.g., puck, granular) | D | C | C | B | B |
Liquid materials | C | C | B | B | A |
Gaseous materials | C | C | B | A | A |
Chemical Addition [Includes adjusting condition such as pH, alkalinity, carbon feed, etc. and chemicals for other unit processes.] | |||||
Solid materials | C | C | B | B | A |
Liquid non-flammable materials | C | C | B | B | A |
Gaseous materials | C | C | B | A | A |
Flammable materials | B | B | A | A | A |
Effluent Discharge | |||||
Effluent discharge to receiving stream or groundwater | D | C | C | B | B |
Effluent discharge to reclaimed water storage/distribution system for outdoor uses or drinking water treatment plant for further treatment | C | B | B | B | A |
Effluent discharge to reclaimed water distribution system with indoor uses. (If reclaimed treatment facility classified as wastewater facility, use Table 100.4.2 also. If classified in 100.6.1(c) as drinking water facility, use only Table 100.4.2.) | WWBif WW, also DW facility class required | WWBif WW, also DW facility class required | WWA if WW, also DW facility class required | WWA if WW, also DW facility class required | WWA if WW, also DW facility class required |
Effluent discharge to potable water distribution system (Use Table 100.4.2 also.) | WWA also DW facility class required | WWA also DW facility class required | WWA also DW facility class required | WWA also DW facility class required | WWA also DW facility class required |
Solids Handlinq | |||||
Thickening / Conditioning (e.g., gravity, DAF, plate settlers, drum thickeners, volute thickener, centrifuge thickening, polymer addition) Dewatering (e.g., lagoon, drying bed, mechanical such as belt, filter press, polymer addition) Aerobic digestion Solids composting | C | B | B | B | A |
Thermal hydrolysis (e.g., pre-digestion) Stabilization / digestion (e.g., anaerobic sludge lagoon, autothermal or autoheated thermophilic aerobic digestion (ATAD), anaerobic digestion (single, multi-stage)) Nutrient recovery through precipitation (e.g., struvite recovery) Centrifuge for dewatering Solids reduction (e.g., incineration, wet oxidation) | B | B | A | A | A |
Note: 1. The treatment processes are listed as examples and are not all inclusive but are representative and the division will categorize other technologies consistent with this list and classify facilities based on the similar technologies.
5 CCR 1003-2-100.5