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Wastewater Treatment Process Bar Screens Giant rakes allow water to pass, but catch trash like sticks, rags, and toys. Grit Chamber Sand, grit, coffee grounds, and egg shells settle out here. Primary Clarification Tank Sludge settles out at the bottom while grease is skimmed off the top. Aeration Basin Bacteria eat the dissolved solids and denitrify ammonia into nitrogen gas. Homes, Business, Industry, Health Care, Institutions Primary Treatment Activated Sludge Secondary Treatment (based upon the principal of sinking and floating) (based upon the food chain) To Disposal Final Treatment Methane Gas CoGen Facility (Generator) Methane gas is burned to create electricity that runs our plant. Digesters Microorganisms kept at 98 degrees F produce methane gas. (disinfection) Reuse Water Electricity Generation Secondary Clarification Tank Fat, old microrganisms settle out and activated sludge is sent to aeration. Sludge Treatment (from methane gas) (based upon digestion) To Compost or Disposal The R io Gr ande Thickening Sludge is thickened and de-watered before it goes to the digester. Disinfection Ultraviolet light destroys genetic material in bacteria and viruses. River Flow The cleaned water flows into the Rio Grande.