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 - Ion Exchange Biological Wastewater Treatment - Activated Sludge - Contact beds (anaerobic) - RBC - Sand Filters - Trickling Filters Chemical Precipitation (reaction vessel) Clarification - Primary - Secondary - Tertiary Chrome Reduction Cooling water (contact and non-contact) Cyanide Destruction Dentention basins, Swales, Infiltration trenches Disinfection Equalization Evaporation - Single - Multiple Filtration/Sludge Dewatering - Cartridge - Centrifuge - Filter Press - Membrane - Vacuum Filter Flocculation/Mixing/Coagulation Flotation Neutralization/pH Adjust - Single - Multiple Oil/Water Separation - Gravity fed - Baffled Pumping (in-plant) Settling - With manual sludge removal - With mechanical sludge removal Sludge Blending/Thickening Sludge Drying (mechanical dryers) Silver Recovery Unit Stripping (Air/Steam)