Wastewater Microbiology

Wastewater Microbiology - Wastewater Microbiology ESM 219...

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1 ESM 219 Wastewater Microbiology Wastewater Microbiology Microbes are the catalysts in biological treatment, converting dissolved nutrients to biomass which is then separately disposed of Harmful microbes are killed by disinfection prior to releasing the final effluent Solids may be digested by anaerobic microbes, producing energy rich gas Wastewater constituents Major classes – Suspended solids (TSS, VSS, etc.) – Biodegradable organics (BOD, COD – Pathogens (bacteria, viruses, protozoa, etc.) – Nutrients (N, P, etc.) – Priority pollutants (EPA designated toxics) – Organics that don’t biodegrade (refractory) – Heavy metals (Cd, Zn, Pb, Hg, Cu) – Ions (pH; contribute to TDS e.g. Ca 2+ , Na + , SO 4 -2 ) – Temperature – toxicity Biochemical Oxygen Demand (BOD) Establishes biological “strength” based on oxygen uptake by microbes during aerobic metabolism of organics in waste 5-day (BOD 5 ) and 20-day (BOD 20 ) Carbonaceous (CBOD) Nitrogenous (NBOD) Ultimate (UBOD) BOD •Standardized •Need: Incubator Bottles DO meter Dilution water Seed (opt.) Expressed in mg/L
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