257 CMR, § 2.15

Current through Register 1533, October 25, 2024

Section 2.15 - Permit for Discharge

(1)Rating System for Permit Categories.

(a)Unit Operations is defined as any component of a process that could be utilized solely or combined to attain a specific objective. The rating system is based on the number of specified unit operations in a proposed wastewater treatment facility and the total number of points assigned to each unit operation.

(b)Type I Facility -any facility that has less than three unit operations as listed and has a rating of < 20 points.

(c)Type II Facility -any facility that has three or more unit operations as listed or has a rating of > 20 points.

(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

257 CMR, § 2.15