Which of these methods should NOT be used for disposal of urine and faeces if no sewage system is available?

(a) allowing untreated sewage to flow into rivers
(b) making septic tanks for sewage to flow into
(c) allowing sewage to flow into a biogas plant
(d) using a vermicomposting toilet

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Solution

(a) allowing untreated sewage to flow into rivers

Disposal of untreated sewage directly into rivers can result in serious water pollution. This, in turn, can result in major health hazard for fish, birds, animals and humans. Polluted water is unsuitable for drinking, agriculture and industry.

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