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City of Lubbock’s Southeast Water Reclamation Plant Preliminary Treatment Raw wastewater (sewage) is brought in by large pumps that filter out large solids such as trash, rags, and tires. Smaller solids, grit, are also allowed to settle out of the water. Influent Primary Treatment Screw Pumps Wastewater is sent to settling tanks called clarifiers where heavier solids, sludge, sink and lighter solids, scum, float. They are then removed. Bar Screens Grit Chamber Secondary Treatment Air and bacteria are added to the water to release gases and allow the bacteria to eat the organic matter, before going to another clarifier for settling. Primary Clarifier Aeration & Bacteria Treatment Tertiary Treatment The wastewater is disinfected by UV lights and nutrients are removed that are harmful to animals, plants, and humans. Digester Secondary Clarifier Disinfection Dewatering Effluent Reclaimed Water BioSolids City of Lubbock Conservation & Education Department Solids Treatment Sludge is heated in digesters to kill microbes and then sent to be dewatered. Final Products Bio-solids are sent to the landfill or used as soil enhancements. The treated water (reclaimed) is discharged in surface water, used in irrigation and power plant cooling towers. City of Lubbock’s Southeast Water Reclamation Plant Preliminary Treatment Physical Process Screw Pump Secondary Treatment Physical Process Influent Grit Chamber Bar Screen Tertiary Treatment Chemical Process to primary clarifiers Secondary Clarifiers Filters Aeration & Bacteria Tanks UV Disinfection Digester Secondary Treatment Biological Process Electrical Energy Power Plant Biosolids (sludge) Dewatering of Bio-solids Landfill Compost Effluent Primary Clarifiers Primary Treatment Physical Process Industrial Reuse Agricultural Irrigation Stream Discharge