Question
Download Solution PDFWhat is the main reason for pH control during disinfection?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Disinfection may be defined as the process of destruction or inactivation of harmful micro-organism in water either by physical process or chemical process.
Note:
pH plays an important role during disinfection
- At pH < 5, chlorine does not react with water and remains as free chlorine.
- (HOCL +OCL-) are combined called freely available chlorine. Out of these forms of freely available chlorine, HOCL is most destructive. It is 80% more effective than OCL- ion. Hence pH of water should be maintained slightly below 7
For chemical disinfection of water the following disinfectants can be used:
- Chlorine (Cl2)
- Chlorine dioxide (ClO2)
- Hypo chlorite (OCl-)
- Ozone (O3)
- Halogens: bromine (Br2), iodene (I)
- Metals: copper (Cu2+), silver (Ag+)
- (KMnO4)
- Alcohols
- Soaps and detergents
- Hydrogen peroxide
- Several acids and bases
For physical disinfection of water the following disinfectants can be used:
- Ultraviolet light (UV)
- Electronic radiation
- Gamma rays
- Sounds
- Heat
Last updated on May 28, 2025
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