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STEPS TO CLEAN WATER The process flow diagrams shown below sedimentation basins while the industrial of dissolved and colloidal material graphically depict the path domestic and stream is pumped to the aerated lagoon. remaining in the water after primary industrial wastewater takes through the sedimentation. Air accomplishes two White Slough treatment facility as it is © PRIMARY SEDIMENTATION things:first,the organisms are brought being treated. Quiescent conditions in the primary into contact with the dissolved pollutants sedimentation basins permit the heavier they can use as food,and second,oxygen OPRELIMINARY TREATMENT solids to settle to the bottom of the basins is available for use in converting food Raw domestic and industrial wastewater where they are collected and pumped into cell growth. Blowers provide the travels approximately 5 miles from the to the anaerobic digesters. Fats and air required by the process.Flow leaving City of Lodi and enters the White Slough greases are skimmed off the top of these the aeration basins is directed to a dis- headworks. Here the flows are measured basins and also sent to the digesters. tribution box and then on to the and special grinders reduce the size of secondary clarifiers. the coarse material. A grit removal © AERATION BASINS facility removes inert material such as In the aeration basins,air is introduced Q SECONDARY CLARIFIERS sand,rocks,egg shells,and seeds from to mix the basin contents and to transfer Sedimentation is an integral part of the the stream. This material is dewatered oxygen into the"mixed liquor." This biological treatment process. Aker aera- at the grit washing facility and sub- promotes contact between the waste- tion,the mixed liquor is settled in the sequently disposed of at a landfill. water and microorganisms contained in quiescent secondary clarifiers,thereby Variable speed pumps lift the domestic the mixed liquor in the presence of removing the organic pollutants that ;- wastewater up into the primary oxygen to allow biological assimilation have been converted into biological DOMESTIC PRIMARY PRELIMINARY TREATMENT SEDIMENTATION AERATION DISTRIBI (HEADWORKS) BASINS BASINS BO: O u F RAS Z Z GRIT IINDERFLOW AWL RETURN AIR z Z BLOWER C) PS y (2) O DETRITORS TWAS = - Z_ o GRIT HEAT (2)DISSOLVED WASHING EXCHANGER DIGESTERS AIR FLOTATION GRIT HOPPER O THICKENERS SLUDGE LAGOON .:.�. IRRIGATION Q INDUSTRIAL I AERATED SKIMMING LAGOON POND PROCESS F DESIGN CRITERIA Basic Design Influent Pumps secondary Clarification Average Dry Weather...............................................85 mad Domestic,12 incl ................__..._..__...........2 Clarifiers Peak Wet Weather Flow.........................................15.6 mgd Is inch_.._................._.................1 Size:100 diameter lnedustrla1.12inch_.__...___......._....._..........1 OverFlow rate,gat/ Wastewater Loadings Flt inoh..___._...............................1 Pumps BODS Avg.Concentration 220 mg/L Return sludge pum Suspended Solids,Avg.Conc....................... 240 mg/L Primary sedimentation Gpacity each,gpm Bastes Waste sludge pump Headworks Size:90'x 20'x F 5WD...................... .......... Capacity each,spin Parshall Flumes Detention time,hours...................................1.5 Domestic,24 inch..........................................1 Pumps Chlorination-Dechlorination Industrial,18 inch........................................1 Primary sludge and scurn ...................10 Chlorine Contact Time,W Comminutors Capacity,gpm........._.....................................175 Chlorinators Domestic,25 inch...._...._............................_2 2"Ib/day capacil Industrial,25 inch.........................................1 Aeration 50016/day capacity Grit Facilities Basins 5elforamrs Detrltors,16 foot diameter............_........_..2 Size:137'x30'x15SWD...................._....,...4 100016/daycapadt Cycloneonddassifier_.................................1 Detention time,hours.....-.............................2