T7 - CIVL 242 TUTORIAL 7 So (ceso@ust.hk) Kin...

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CIVL 242 TUTORIAL 7 So (ceso@ust.hk) Kin (ceskin@ust.hk)
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Disinfection Sterilization Disinfection Sterilization: Complete killing all forms of life. Disinfection: Inactivating pathogenic microorganisms. It is not necessarily to kill pathogenic microorganisms. Some bacteria are still respiring after disinfection while the bioassay indicates no detectable one.
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Disinfection (cont.) Characteristics of ideal disinfectants: Capable of inactivating; Non-toxic to humans, domestic animals, or aquatic species; Should not generate harmful disinfection by-products (DBPs); Easy and safe to store, transport, and dispense. Low cost; Easy monitored; Provide a stable residual in drinking water. Most common candidates in practice: Chlorination, Ozonation, UV-radiation.
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Chlorine Demand Aqueous impurities, both organic or inorganic compounds may react with chlorine due to the high oxidation potential of chlorine. The reactions between these compounds and chlorine not only result in “ chlorine demand ”, but also form
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This note was uploaded on 09/13/2011 for the course CIVL 242 taught by Professor Gh during the Fall '09 term at HKUST.

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T7 - CIVL 242 TUTORIAL 7 So (ceso@ust.hk) Kin...

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