5 Colo. Code Regs. § 1003-2-100.7
CLASSIFICATION | TREATMENT PROCESS1 | |
Class A | Multiple step chemical conversion, oxidation/reduction reactions (e.g., cyanide destruction, hexavalent chromium reduction, selenium, facilitated with ozone, peroxide, ultraviolet radiation, chlorine, etc.); Ion exchange; | |
Electro-chemical conversion (e.g., electrolysis, electro-oxidation, electro-dialysis, high voltage electro-coagulation/flocculation, capacitive deionization, electro-winning) | ||
Nanofiltration, Reverse osmosis. | ||
Disinfection/inactivation with ozonation, advanced oxidation, electrolytic release | ||
Biosolids reduction using incineration, wet oxidation | ||
Thermal distillation | ||
Solvent extraction | ||
Class B | Chemical coagulation and flocculation; | |
Adsorptive processes (e.g., activated carbon, Zeolite, organoclay, green sand); | ||
Ultrafiltration; Microfiltration; | ||
Coagulation, flocculation | ||
Chemical precipitation; | ||
Enhanced chemical settling (e.g., magnetite) | ||
Chemical softening process (lime) | ||
Suspended, fixed, or a combination of biological processes (e.g., activated sludge, trickling filters, rotating biological contactors, fixed or moving biofilm reactors, membrane bioreactor (MBR), anaerobic reactors/filters, sludge digestion). | ||
Biologically activated carbon | ||
Subsurface submerged reactors (biological, metals removal) | ||
Single step chemical conversion, oxidation/reduction reactions (e.g., iron, manganese) | ||
Oil / water separation with chemical addition (emulsion breaker, etc.). Can include low voltage electro-coagulation for emulsion breaking. | ||
Oil / water separation with chemical precipitation (three phase, etc.) | ||
Low voltage (<50 volts) electro-coagulation for metals removal | ||
Biological or chemical scrubbers (e.g., odor control) | ||
Diatomaceous earth (DE) filtration | ||
Dissolved air flotation (DAF) with or without chemical addition | ||
Centrifuge | ||
Disinfection/inactivation with gaseous chlorine | ||
Dechlorination with gaseous reagents | ||
Chemical addition in gaseous form | ||
Class C | Standard clarification/sedimentation (including waste ponds for settling that regularly utilize chemical addition, but not chemical precipitation for specific reactions); | |
Filtration (e.g., mixed media, pressure, slow sand); | ||
Cartridge/bag filtration | ||
Cloth disk/drum filtration | ||
Neutralization (e.g., pH adjustment); | ||
Solids Dewatering (e.g., sand or surfaced drying beds, mechanical such as belt filter, filter press); | ||
Airstripping; | ||
Biological pond/lagoon, wetlands | ||
Biosolids composting | ||
Oil / water skim pit with mechanical skimmer | ||
Disinfection/inactivation with ultraviolet (UV) radiation, free chlorine (e.g., liquid, solid), peracetic acid | ||
Dechlorination with solid or liquid reagents | ||
Chemical addition in dry or liquid form (other than when used in processes listed as Class B or A) | ||
Class D | Particulate settling ponds/tanks, without chemical addition; Simple gravity flow filtration without chemical addition; | |
Physical water/gas separation without chemical addition; | ||
Cooling water discharge without chemical addition | ||
Physical oil / water separation without chemical addition (emulsion breaker, etc.) | ||
(e.g., gravity separator, corrugated plate separator, tube settler, hydrocyclone). Can | ||
include heater/treater or coalescing mesh filter. | ||
Construction dewatering filter sock | ||
Storage pond | ||
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 1003-2-100.7