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प्रश्न
Which of the following is/are products of wastewater treatment?
विकल्प
Biogas
Sludge
Both biogas and sludge
Aerator
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उत्तर
Both biogas and sludge
Explanation:
The sewage is treated to destroy the germs and reduce the contaminants. In wastewater treatment, wastewater is passed through a sedimentation tank, in which organic materials settle down and are removed with a scraper. This is called sludge. In a separate tank, sludge is acted upon by anaerobic bacteria which produce methane, carbon dioxide and biogas by a process known as digestion. Therefore, both sludge and biogas are products of wastewater treatment.
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