Environmental Engineering

Add 2 or 3 ml of sodium thiosulphite solution to destroy residual chlorine if any. 6. Take the sample as follows: Strong wastes: 0.1, 0.5 or 1% Settle domestic sewage: 1, 2.5 or 5% Treated effluents: 5, 12.5 or 25% River water 25% to 100%. ................
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