SSC_JE_CE_Environmental Engineering Booster Quiz-7

A certain waste has a BOD of 162 mg/l and its flow is 1000 cubic metres per day. If the domestic sewage has a BOD of 80 gram per capita per day, then the population equivalent of the waste would be:

One litre of sewage when allowed to settle for 30 minutes gives a sludge volume of 27 cm³. If the dry weight of this sludge is 3 grams, then its sludge volume index will be

When minimum velocity requirement in a sewer is not satisfied, then

If the sewage flows in a sewer with maximum velocity, the ratio of the depth of the sewage flow to the vacant depth is

Good quality sand is never obtained from

The rate constant K of BOD equation :

A town having a population of 30000 persons is producing the domestic sewage at the rate of 120 lpcd having 200 mg/l of BOD . Calculate the quantity of BOD of domestic sewage per day?

Primary treatment of waste water is made with the application of which of the following?

A mixed liquor with 2500 mg/l of suspended solids has the settled volume of 225 ml from a liter of this mixed liquor. Its sludge volume index is

Due to super-saturation of water body with dissolved oxygen cause