"Environmental Engineering _Quiz 2 "

What is the maximum permissible limit of fluoride in drinking water?

Calculate the maximum rate of effluent application in the dispersion trench where the percolation test carried out at site takes 4 minutes?

Calculate the percentage efficiency of BOD removal of an activated sludge treatment plant:

Incoming BOD = 250 mg/l

Outgoing BOD = 20 mg/l

A 250 ml water sample initially has pH 10. For the sample of pH 4.5, 25 ml of 0.02 N  is required. The total alkalinity of water as  in mg/l is

A town having a water demand of 20 MLD is to be supplied with water having a residual chlorine concentration of 0.3 ppm, If the chlorine demand in raw water is 0.6 ppm and the available chlorine in bleaching powder is 20 %, the amount of bleaching powder per day is

Consider the following characteristics:

a) Effective size: 0.5 mm

b) Uniformity coefficient: 2.5

c) Filtration rate: 5.0 m³/m²/h

Which of the above values are correct in respect to rapid sand filter?

If pH value solution A is 4 and that of solution B is 6 then the hydrogen ion concentration of solution:

Grit chamber removes particles of size

If design overrate flow of a settling tank is 43.2m³/m²/day and the design flow is 0.5m³/sec. Then surface area of tank is