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7. RECOMMENDED PLAN <br /> <br />Modifications provide flexibility for dry and wet weather operations to achieve seasonal <br />effluent requirements. Bioreactor capacity is h-~creased through increased average mixed <br />liquor concentrations, however, solids loading to the secondary clarifiers is reduced. Table <br />7.2.1-1 (located at the end of this chapter) summarizes the existing and proposed 2025 unit <br />process, equipment, and design criteria. <br /> <br />FIGURE 7.2.1-1 <br />Recommended Aeration Basin Modifications to Step-Feed, Plug-Flow Activated Sludge with Selectors <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> -- Pfima~y E~ue~: <br /> and PAS <br /> <br /> Header <br /> <br /> CI.riflem <br /> <br /> Pflrna~/Effluent <br /> ~oll~r Box and <br /> Conb'ol Gate <br /> <br />7.2.2 Secondary Clarification Enhancements <br />Recommended enhancements to each of the secondary clarifiers include the following items <br />and are shown on Figure 7.2.2-1: <br /> <br />· New energy-dissipatinginlet <br />· New flocculationwell <br />· New outboard launder <br />· New weir and scum baffle <br />· New scum skimmer arms <br />· New density current baffle <br />· Convert existing mechanism to suction manifold <br /> <br />Modifications to the operation of the existing secondary clarifiers will include adjustments <br />to the tmderflow concentrations and flow rates required to maintain a high solids <br />compaction zone and a low solids inventory in the clarifier. Additional RAS pumping is not <br /> <br />MWMC_7.0_REV4,DOC 7-3 <br /> <br /> <br />