Waste Water Engineering Questions

• The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is
• In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
• The effluent of a septic tank is
• Pick up the correct statement from the following :
• The presence of free ammonia in sewage, is detected by
• The clarigesters are
• During preliminary treatment of a sewage
• A drop manhole is provided if
• Nitrogen cycle of sewage, is
• The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula the maximum run off is
• The recommended detention period for grit chambers is
• The most dangerous pollutant in vehicular emissions is
• The gradient of sewers depends upon
• For design purposes, the normal rate of infiltration of ground water into the sewer, is
• Pick up the incorrect statement from the following :
• For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
• Pick up the correct statement from the following :
• The small sewers are cleaned by
• For a circular sewer of diameter D running partially full with central angle α,
• The factor responsible for purification of sewage in river is