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MWMC FACILITIES PLAN <br /> <br /> Odor control covers at the primary clarifier effluent latmders <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 metering 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 />· B[sulfite 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 />FIGURE 7.2.6-1 <br />Proposed Effluent Stream Disinfection Operation <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Preliminary ~ ~ <br /> Raw I <br /> Treatment // ~ Primary Secondary <br /> Sewage ~ Preliminary Effluent ~,.J Primary ~ Effluent Aeration Effluent ~ Sodium To Outfall~ <br /> Treatment ~ ~"'l Basins v ~sint~timl <br /> <br /> ~im~ <br /> Effluent ~ High-Ra!e <br /> ~version Sodium <br /> Hypochh~fite <br /> <br />7-6 MWMC 7,0 REV4.DOC <br /> <br /> <br />