38 brock biology of microorganisms 13th edion terary

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Unformatted text preview: ds on the quality of the source of water Effect of water treatment on public health 29 Brock Biology of Microorganisms, 13th Edi<on. New York City water sources 30 hPp://www.nyc.gov/html/dep/html/drinking_water/wsmaps_wide.shtml Steps in water treatment 1) Sedimenta<on: •  •  Water is lew to stand in a reservoir (sedimenta<on basin). Allow large par<cle (sands) to sePle 31 Brock Biology of Microorganisms, 13th Edi<on. 2) Floccula<on treatment (chemical coagula<on) •  A floccula<ng chemical (coagulant) is added. •  Water is transferred to a floccula<on basin and allowed to sePle for ~6h. •  As the flocs (flaky precipitates) form, they trap fine par<cles (clay, bacteria, viruses, pro<sts). •  Some organic chemicals are also absorbe...
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