Q. What is the minimum amount of DO required for the life survival of aquatic animals?

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Q. Oxygen demanding wastes improves DO.

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Q. In the concept of self purification of natural streams, complete the following phrase.
Solution to pollution is _________

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Q. _________ is accomplished by the replenishment of oxygen lost to bacterial degradation of organic waste.

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Q. On which of the following does the self purification process does not depend?

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Q. Flowing water bodies recover rapidly.

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Q. In a flowing stream, the breakdown of degradable wastes by bacteria ________ dissolved oxygen.

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Q. What is the objective of water quality management?

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Q. The impact of pollution depends upon nature of the pollutants and the ___________

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Q. The wastewater disposed on land reaches groundwater and thereby contaminates surface water.

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Q. What does LPED stand for?

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Q. _______ is an improved sinkhole or a subsurface fluid distribution system.

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Q. Waste water is injected into the ground between impermeable layers of rocks to avoid polluting fresh water supplies.

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Q. _________ is the controlled application of waste water onto the land surface to achieve a specified level of treatment.

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Q. Which type of treatment methods are used for municipal and industrial wastewaters?

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Q. How are suspended solids removed from the soil?

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Q. How are the traces of organic compounds removed from the soil?

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Q. Which of the following wastewater constituents are removed by chemical immobilization?

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Q. Which of the following is an intensive method of land treatment?

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