ESM_214_05_Lecture8

ESM_214_05_Lecture8 - ESM 214 05 Lecture 8: Biological...

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ESM 214 05 Lecture 8: Biological treatment
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Comparing Plug flow and Complete Mix aeration basins True plug flow: need 40:1 (length –width) Impractical except in chlorine contact Filamentation more likely with plug flow Filaments are required for floc formation Filament overgrowth is a nuisance Anoxic selector upstream, in AB, reduces filamentation with PF reactors.
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Membrane Reactors An innovation in biological treatment. High MLSS: 15000 mg/L Long SRT: 5 to 20 d Low waste solids Superior effluent quality
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Membrane Reactors
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Trickling Filters: Reactors using “fixed film” biological Treatment
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Modeling concepts in fixed-film treatment
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RBCs Rotating biological contactors use bacteria to convert organic wastes to carbon dioxide and water, plus more cells. RBCs are another fixed-film treatment technology
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Full Size U.S. Filter/Envirex RBC Still more RBCs………
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Mechanical Drive U.S. Filter/Envirex RBC
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suspended growth vs. fixed film biological treatment Suspended growth: Biomass well-mixed, in suspension Diverse microbiology High energy aeration systems Process control follows from modeling Shocked more easily Biomass recycled High solids production, easy to settle High efficiency DO 2 to 3 mg/L Fixed film: Biomass layered, attached More diverse (snails!), stratified microbiology Frequently relies on draft for aeration Process control is empirically based on organic and hydraulic loading Resilient to shock loads Biomass not typically recycled Low solids production, hard to settle (low floc formers) Lower efficiency Higher DO required unreliable N & P removal
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ESM_214_05_Lecture8 - ESM 214 05 Lecture 8: Biological...

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