Code of Massachusetts Regulations
257 CMR - BOARD OF REGISTRATION OF OPERATORS OF WASTEWATER TREATMENT FACILITIES
Title 257 CMR 2.00 - Certification Of Operators Of Wastewater Treatment Facilities
Section 2.15 - Permit for Discharge
Current through Register 1531, September 27, 2024
(1) Rating System for Permit Categories.
(2) The following is the list of unit operations commonly used in wastewater treatment systems.
Absorption/Adsorption |
|
- Carbon |
5 |
- Ion Exchange |
5 |
Biological Wastewater Treatment |
|
- Activated Sludge |
6 |
- Contact beds (anaerobic) |
5 |
- RBC |
5 |
- Sand Filters |
4 |
- Trickling Filters |
4 |
Chemical Precipitation (reaction vessel) Clarification |
|
- Primary |
5 |
- Secondary |
5 |
- Tertiary |
5 |
Chrome Reduction |
5 |
Cooling water (contact and non-contact) |
2 |
Cyanide Destruction |
5 |
Dentention basins, Swales, Infiltration trenches |
2 |
Disinfection |
5 |
Equalization |
2 |
Evaporation |
|
- Single |
2 |
- Multiple |
5 |
Filtration/Sludge Dewatering |
|
- Cartridge |
3 |
- Centrifuge |
8 |
- Filter Press |
8 |
- Membrane |
5 |
- Vacuum Filter |
10 |
Flocculation/Mixing/Coagulation |
5 |
Flotation |
5 |
Neutralization/pH Adjust |
|
- Single |
3 |
- Multiple |
5 |
Oil/Water Separation |
|
- Gravity fed |
2 |
- Baffled |
5 |
Pumping (in-plant) |
3 |
Settling |
|
- With manual sludge removal |
3 |
- With mechanical sludge removal |
5 |
Sludge Blending/Thickening |
5 |
Sludge Drying (mechanical dryers) |
5 |
Silver Recovery Unit |
5 |
Stripping (Air/Steam) |
5 |