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 vermi-composting toilet
Answer:A
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 vermi-composting toilet