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MWMC FACILITIES PLAN <br /> <br /> Odor control covers at the primary clarifier effluent launders <br /> Odor control covers at the primary clarifier feedwells <br /> Odor control covers at the primary sludge thickening facility <br /> Odor control covers at the new screening channels <br /> Odor control hoods at the expanded screenings and grit loadout facilities <br /> <br />With the implementation of bioscrubber vessels, the existing biofilters can be phased out of <br />service and the new bioscrubbers will handle the existing odor control needs in addition to <br />the new needs. Bioscrubbers occupy significantly less site space and disperse odorous air <br />more effectively than biofilters. They are easily phased in as needed for additional odor <br />control capacity. Table 7.2.1-1 summarizes the existing and proposed 2025 unit process, <br />equipment, and design criteria. <br /> <br />7.2.6 Disinfection <br />Sodium hypochlorite disinfection facilities are recommended for disinfection of both <br />primary and secondary effluent flow streams as shown in Figure 7.2.6-1. Recommended <br />new facilities include the following items: <br /> <br /> Horizontal bulk storage tanks for hypochlorite (3 at 20,000 gallons) <br /> Vertical bulk storage tank for bisulfite (1 at 7,000 gallons) <br /> Hypochlorite meterh'~g pumps for chlorination of secondary effluent <br />,, Hypochlorite metering pumps for chlorination of primary effluent diversion flow <br /> Bisulfite metering pumps for dechlorination of secondary effluent <br /> Bisulfite metering pumps for dechlorination of primary effluent diversion flow <br /> 1.3-million-gallon chlorine contact basin for primary effluent diversion flow <br /> <br />Disinfection of primary effluent and secondary effluent flow streams will be treated <br />separately. Each flow stream will require separate dosage control for chlorine and bisulfite. <br />The existing chlorine building will house the new storage tanks and facilities. Table 7.2.1-1 <br />summarizes the existing and proposed 2025 unit process, equipment, and design criteria. <br /> <br />F~GURE 7.2,6-1 <br />Proposed Effluent Stream D~s~nfection Operation <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Prchmmary <br /> Raw Treatment Primary S~ondavy $ochum To ~tfalI~ <br /> Sewage re ~ehmm~y Elfluent Effluent ~ Aeranon Effluent <br /> Hyp~nlorile <br /> Treatment <br /> <br /> ~lm~ <br /> Effluent High-RaI~ <br /> ~cr~on t Sodmm <br /> Hyp<hlonte <br /> <br />7-6 MWMC_7,0_REV4 DOC <br /> <br /> <br />