Discussion
Which of the following statement is correct?
I. By-products of waste water treatment are sludge and biogas.
II. Septic tanks are suitable for places where there is no sewerage system.
Answer: C
Waste water treatment produces sludge and biogas as by-products: the sludge settles out and is treated, and the biogas, mostly methane, is produced when the sludge is digested without air, so statement I is correct. A septic tank is an on-site system for houses in places that have no sewerage system, so statement II is also correct. Both statements are right, and the answer is Both I and II, option (C). Here both of the statements describe real arrangements: the sludge is removed and digested, and the gas is collected and used as a fuel, and septic tanks serve scattered houses.
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