Lecture_10_ESM 214

Lecture_10_ESM 214 - ESM 214 05 Lecture 10: Effluent...

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ESM 214 05 Lecture 10: Effluent Disinfection & Disposal
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Disinfection Reduce pathogen content Typical limit 200 MPN FC / 100 mL Means Chemical Physical Mechanical Radiation Dose, time, media, pathogen dependent
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Disinfection kinetics ln N t = ln N 0 -k’t e kt N 0 N ; N k' dt dN - = - = Chick’s Law
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Time and dose dependency of E. coli killing in a batch lab reactor at 20° C.
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water chemistry is pH dependent Cl 2 + H 2 O HOCl + H + + Cl - (HOCl at pH<6) HOCl H + + OCl - (hypochlorite ion at pH>9) Cl- is NOT a disinfectant HOCl more powerful, pH most effective (<7.4) free available chlorine: HOCl + OCL - calcium hypochlorite [Ca(OCL) 2 ] (70% available chlorine in water); sodium hypochlorite (NaOCl) at 5 to 15% solns Chlorine chemistry
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Chlorine chemistry (cont.) chloramines : mono-, di-, tri-: rxn w/ ammonia; kill, but not good disinfectants; combined available chlorine HOCl + NH 3 H 2 O + NH 2 Cl > pH 8.5 HOCl + NH 2 Cl H 2 O + NHCl 2 HOCl + NHCl 2 H2O + NCl 3 <pH 4.4
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Lecture_10_ESM 214 - ESM 214 05 Lecture 10: Effluent...

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