Biological oxidation ponds remove organic matters present in the polluted water by _______________?

Related Mcqs:

Fresh sewage is ______________ in nature?

A. Acidic B. Neutral C. Alkaline D. Highly acidic...

Corrosion in boilers can be prevented by _________________?

A. Deaeration of feed water B. Enhancing pH of feed water by adding alkali C. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion D. All A., B. and C....

In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?

A. t = 15 – 0.0065h B. t = 15 + 0.0065h C. t = 0.0035h -15 D. t = 15 – 0.0035h...

Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?

A. Grinding B. Machining C. Cutting D. Polishing...

Which of the following processes is involved in the biochemical treatment of sewage effluents ?

A. Oxidation B. Reduction C. Dehydration D. Fermentation...