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MWMC FACILITIEs PLAN <br /> <br /> One (1) 7,000-gallon vertical bulk storage tank for bisulfite <br /> <br /> Five (5) hypochlorite metering ptLmps for main plant flow chlorination <br /> Two (2) hypochlorite metering pumps for diversion flow chlorination <br /> Two (2) bisulfite metering pumps for main plant flow dechlorination <br /> Two (2) bisulfite metering pttmps for diversion flow dechlorination <br /> <br /> Piping, valves, mechardcal, electrical and control systems associated with chemical feed <br /> and storage for both the main plant flow and the diversion flow <br /> <br /> 1.3-million-gallon total chlorine contact basin volume providing 20 minutes of detention <br /> time for PE diversion flow and using diversion pipeline for partial detert~on time <br /> <br />The existing final treatment building be used for liquid chemical feed and storage. The <br />existing chlorine contact basins would not need major modifications and would be used for <br />disinfection of the main plant flow. The existing chlorine feed and storage facklity would <br />require remodeling to accommodate the new equipment. Additionally, walled secondary <br />containment would be required for the bulk chemical storage tanks. <br /> <br />Alternative 2: Ultraviolet Disinfection of Secondary Effluent and Hypochlotite Disinfection of <br />Primary Effluent <br />This alternative develops an ultraviolet (UV)/sodimm hypochlorite-based disinfection <br />system. In this alternative, a medium-pressure, high-intensity UV system would be used to <br />disinfect secondary effluent flows up to 165 mgd, which is the capacity of the secondary <br />treatment process. UV is a viable alternative for SE because the flow has low TSS <br />concentrations and a high percentage of trarrsmittance. Because of the low percentage of <br />transmittance and high TSS concentrations, UV is not a viable option for PE diversion <br />disinfection. Up to 140 mgd of PE flow will be diverted around secondary treatment and <br />dis~kfected using sodium hypochlorite. The following equipment would be required for th_is <br />alternative: <br /> <br /> ,, UV package system <br /> <br /> 800 kW back-up power generator or secondary power source <br /> <br /> One (1) 20,000-gallon horizontal bulk storage tanks for hypochlorite <br /> <br /> , One (1) 6,000-gallon vertical bulk storage tank for bisulfite <br /> <br /> Two (2) hypochlonte meterJ.ng pumps for diversion flow chlorination <br /> <br /> Two (2) bisulfite metering pmmps for diversion flow dechlorination <br /> <br /> Piping, valves, mechanical, electrical and control systems associated with chemical feed <br /> and storage for the diversion flow <br /> <br /> ~ 1.3-MG total chlorine contact basin volume for PE diversion flow. <br /> <br /> This alternative would require the construction of a new UV facility with UV channels, <br /> channel isolation gates, and level control gates. The UV system does not require chemical <br /> <br /> 0_REV! ! DOC <br /> <br /> <br />