Q. Which of the following is not an after effect of accumulation of nitrogen and phosphorus in aquatic ecosystem?

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Q. Which of the following genera the nitrifying bacteria doesn’t belong to?

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Q. The optimal removal of phosphate by biological method should have a COD/P ratio of 20g COD/g of phosphate.

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Q. Ferrous ions can supplement biological phosphate removal.

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Q. Expand OLNAD.

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Q. The major disadvantage of heterotrophic nitrification is ____________ for final disposal.

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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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