BIOL241 Final: Unit 8
1 Apr 2016
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Wastewater: liquid effluents derived from domestic sewage or industrial sources, which for reasons of public health and for recreational, economic, and aesthetic considerations, cannot be disposed of merely by discarding them untreated into lakes or streams. Also produce wastewater streams need to control may contain toxic substances. Pre-treating liquid waste streams, dump into municipal and treat. **domestic: sewage, grey water (washing, bathing, cooking), food processing. High levels of effluent bas reduce inorganic nutrient levels (n, p) Pathogens, parasites :(salmonella, vibrio, cryptosporidium, viruses, helminth worms) Primary treatment (physical) screening: removal of large objects sedimentation: of grit, solids. Secondary treatments (biological) trickling filter (aerobic), or activated sludge (aerobic) sludge digestion (anaerobic) (b/w s &t) disinfection (chemical) Tertiary treatments (chemical, biological, physical) any physicochemical or biological process employing bioreactors, precipitation, filtration, or chlorination procedures similar to those employed for drinking water treatment. Biol241 page 1 e. g. , n removal, p removal. Retrofitting plants so they can do that is very expensive.
