Q. Which of the following method can be used to treat crude sewage and nitrify secondary effluent?

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Q. Duck weed can grow profusely in nutrient rich waste water.

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Q. Which of the following methods can be used to convert organic pollutants into fish biomass?

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Q. The bacterial biofilms and floating weeds interact in duckweed ponds resulting in decrease of nutrient load and _______ in waste water.

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Q. The hollow rhizomes of the reeds generate a hydraulic pathway thereby treating sewage by ___________

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Q. Which of the following factors doesn’t need to be considered in order to make the system of nutrient removal cost effective?

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Q. __________ method can be used for enhancing the performance of waste stabilization ponds.

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Q. Algal fish ponds require artificial aeration.

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Q. Nitrogen and __________ are the main source for eutrophication of surface water?

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Q. Ammonia is converted into nitrate which is converted into__________ and released into the atmosphere.

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Q. Which of the following process is leads to removal of nitrogen gas from water?

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Q. The total Nitrogen load = (soluble organic nitrogen and ammonia from incoming wastewater) + (nitrogen from Return Activated Sludge) + (nitrogen from recirculation).

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Q. Particulate organic nitrogen is termed as the material that can pass through a 0.2-μm filter.

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Q. Biological oxidation of ammonia is called as ____________

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Q. Nitrification of ammonia involves two oxidation stages.

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Q. Which of the following metal catalyst is not used during catalytic oxidation of ammonia?

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Q. _____________ bacteria get the energy from oxidation of inorganic nitrogen compounds.

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Q. Which of the following bacteria is involved in nitrification of ammonia?

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Q. Bacteria eat a lot of ammonia produced in the fish gills.

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Q. The optimum growth temperature of nitrifying bacteria is __________

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