Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

100 mg/l
150 mg/l
250 mg/l
50 mg/l

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Waste Water Engineering
The stone ware sewers

All listed here
Are manufactured from clays and shale
Are used for carrying sewage and drainage from houses
After casting are dried and burnt at temperature 150°C, 700°C and 1200°C

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