121. 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
122. 1000 kg of sewage contains
123. Water content of sewage is about
124. A circular sewer section is preferred to because
125. The ratio of minimum hourly flow to the average flow of sewage is
126. In a fully mechanised composting plant, involves
127. For drainage pipes in buildings the test applied before putting them to use, is
128. During purification process of sewage the gas given off, is
129. Antisyphonage pipe is fitted
130. 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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