The anaerobic method of composting practiced in India is called the

For what is the design of distribution mains for water done?

The area of land where all the precipitation falls and flows downhill into a specific stream is called a

The moisture content of a sludge is 92% which is reduced to 87% in a sludge digestion tank. The percentage volume reduction occurred is

What does BOD/COD = 0 indicate about wastewater?

When is coagulation and flocculation with alum performed in a water treatment process?

One sewer has a diameter of 300 mm and another one has a diameter of 600 mm. When both run half-full, what will be the ratio of velocities in the two pipes if the slope of both pipes is the same?

The MLSS (Mixed Liquor Suspended Solids) concentration in an aeration tank is 2500 mg/l, and the sludge volume after 30 minutes of settling in a 1000 ml cylinder is 150 ml. What is the sludge volume index in ml/g?

A sample of water contains an organic compound C₈H₁₆O₈ at a concentration of 10^-3 mol/l. Given that the atomic weight of C = 12 g/mol, H = 1 g/mol and O = 16 g/mol, the theoretical oxygen demand of water (in g of O₂ per litre, round off to 2 decimal places), is______.

A coagulant treatment plant with a flow of 0.5 m3/sec and influent solid concentration of 50 mg/l requires 15 mg/l of alum. If the effluent suspended solids concentration is 15 mg/l, solid content of sludge is 1.5 percent and specific gravity of solids is 2.95, then the volume (in m3/day) of sludge that must be disposed is