21. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is
22. 1000 kg of sewage contains
23. Water content of sewage is about
24. A circular sewer section is preferred to because
25. The ratio of minimum hourly flow to the average flow of sewage is
26. In a fully mechanised composting plant, involves
27. For drainage pipes in buildings the test applied before putting them to use, is
28. During purification process of sewage the gas given off, is
29. Antisyphonage pipe is fitted
30. The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
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