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Question
Which of the following impurity present in sewage is removed by chlorination?
Which of the following impurity present in sewage is removed by chlorination?
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Solution
The correct option is D Phosphates
Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease-causing bacteria and other microbes.
The organic impurities include human faeces, animal waste, oil, urea (urine), cow dung, fruit and vegetable wastes etc. The inorganic impurities include nitrates, phosphates and metals.
During the tertiary stage of sewage treatement, they are removed by adding disinfectant chlorine (chlorination) to waste water body.
Phosphates
Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease-causing bacteria and other microbes.
The organic impurities include human faeces, animal waste, oil, urea (urine), cow dung, fruit and vegetable wastes etc. The inorganic impurities include nitrates, phosphates and metals.
During the tertiary stage of sewage treatement, they are removed by adding disinfectant chlorine (chlorination) to waste water body.
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