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cell growth. Settled sludge is removed by mixing chlorine gas and water. The are combined and pumped to the from the bottom of the clarifiers. Return chlorine solution is added at the flash digesters. The sludge is processed in activated sludge(RAS)is used to seed mixer to disperse the chemical. After an airless(anaerobic)environment the new influent wastewater to produce disinfection,some residual chlorine is by bacteria that stabilizes the material the mixed liquor and repeat the cycle. To present and represents a toxic hazard to and creates a useful material called prevent overpopulation of the organism the aquatic life in the Delta. To remove biosohds that is distributed with plant and a shortage of air and food,a portion this threat,the chlorine is neutralized effluent onto agricultural land. The of the activated sludge is pumped to the by the addition of sulfur dioxide digestion process also produces methane sludge thickeners. (dechlorination). gas;this gas is recycled on site,firing boilers which keep the digesters' © DISINFECITONANDDECHLORINATYON O AIR FLOTATION THICKENERS temperatures between 95 and 100 Disinfection and dechlorination of the The solids removed from the secondary degrees F,the optimum environment wastewater is performed prior to clarifiers are pumped to the flotation for peak biological activity. discharge to White Slough. The effluent thickeners to be thickened before being O INDUSTRIAL TREA1rIENT leaving the secondary clarifiers contains sent to the anaerobic digesters. Following preliminary treatment, large numbers of biological organisms. industrial flows are first treated in the Some of these may be pathogenic(disease O ANAEROBIC DIGESTERS aerated lagoon. They then pass into the causing)organisms. To protect public Sludge and scum from the primary skimming pond and on to the storage health,the effluent is disinfected using a sedimentation basins and the thickened ponds. Flows are pumped to irrigation chlorine solution produced at the plant sludge from the flotation thickeners from the equalization pond. CHLORINE MON SECONDARY FLASH CONTACT FLOW CLARIFIERS MIXER TANKS MEASUREMENT O TO IRRIGATION/ ■ or OUTFALL ---- L2 ----- SOLUTION I o _ _-__ - ------------ -----I SULFUR DIOXIDE CI-2 I METERING TANK TO •-_ -----I HEADWORKS I CL2 WAS LN I SOLUTION - SECONDARY SLUDGE -nCHLORINE PUMPING BUILDING METERING TANK STORAGE EQUALIZATION IRRIGATION PONDS POND LOW CHART Irrigation Pumping Heat Exchangers Pumps................................_............_....................._..3 Number—..................................................._..3 W SWD......................2 Capacity each,gpm...._.............................................45011 Capacity each.Btu/hr..................................$00.000 :q Fl/day ..........541 Flotation Thickeners Sludge Lagoons ............3 Number......................................................................2 Numb _ _2 ec......-... ................ ................................. _..........._...._..__...........2,000 Surface Area,sq fL:................._........__ Valu....................1®600 Volume,total cuu itk................ ..531i000 G 300 s........__..._...................q 1 ........__...........................100 Hydraulic Loading,gpm/sq k...............................0.3030 Sludge Digestion n...................................182 Digesters Size:45diameter x 25'SwD_..._.........._.....3 y....................................2 Detenaon Time,days....................................16-22 ...............---..................I Cas Preducfiogcuk/day...........................111,400 y.................._................2