Chlorine in drinking water is used for (A) Disinfection (B) Removal of…
2022
Chlorine in drinking water is used for
(A) Disinfection
(B) Removal of hardness
(C) Odor treatment
(D) Turbidity control
(E) Removal of iron and manganese
Choose the correct answer from the options given below:
Answer: A. A, C, E only — ConceptChlorination works mainly through disinfection and oxidation. Its active chlorine species inactivate microorganisms, while its oxidizing action can…
- A.
A, C, E only
- B.
A, B, C only
- C.
A, D, E only
- D.
C, D, E only
Attempted by 1 students.
Show answer & explanation
Correct answer: A
Concept
Chlorination works mainly through disinfection and oxidation. Its active chlorine species inactivate microorganisms, while its oxidizing action can transform some taste- and odor-causing substances and dissolved metals into forms that later treatment can remove.
Application
In this item, disinfection follows from microbial inactivation. Odor treatment follows from oxidation of odor-causing compounds. Dissolved iron and manganese can be oxidized to insoluble particles and then removed by clarification or filtration.
Contrast
Disinfection: chlorine inactivates disease-causing microorganisms.
Removal of hardness: hardness comes mainly from calcium and magnesium and is treated by softening methods such as lime-soda treatment or ion exchange.
Odor treatment: chlorine can oxidize certain taste- and odor-causing compounds.
Turbidity control: suspended particles are primarily removed by coagulation, sedimentation, and filtration.
Removal of iron and manganese: chlorine oxidizes their dissolved forms so that the resulting particles can be filtered.
Result
The applicable uses are disinfection, odor treatment, and removal of iron and manganese.