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प्रश्न
Identify the INCORRECT statement with respect to sewage treatment.
पर्याय
During tertiary treatment of sewage, waste water is passed into a settling tank.
During preliminary treatment, coarse particulate matter is filtered.
By secondary treatment, BOD of the effluent increases.
Preliminary treatment, physical treatment, biological treatment, and tertiary treatment are steps in sewage treatment process.
MCQ
उत्तर
By secondary treatment, BOD of the effluent increases.
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