Q. _________ is determined by measuring the dissolved oxygen used by microorganisms during the biochemical oxidation of organic matter in 5 days at 20˚C.

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Q. How are many forms of nitrogen present in wastewater?

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Q. After how many days will nitrogen will be oxidized to nitrite and nitrate?

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Q. ______ is determined by measuring the dissolved oxygen used during the chemical oxidation of organic matter in 3 hours.

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Q. Which of the following is used for a small concentration of organic matter?

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Q. Which of the following indicates that the water body has been used for waste disposal?

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Q. What is the maximum concentration of total solids present in wastewater?

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Q. What is the TSS effluent concentration for 7 days?

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Q. The BOD test is carried out for how many days?

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Q. At what temperature the bottles for the BOD test are incubated?

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Q. What is the mathematical expression of BOD?

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Q. In terms of percentage how much BOD is oxidised in 5 days?

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Q. How is COD calculated?

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Q. What is the ratio of BOD/COD in untreated waste?

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Q. What is the ratio of BOD/COD in the final effluent?

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Q. How is TSS calculated?

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Q. Which of these is the used as the indicator when the titration is carried out to determine the amount of COD present in a sample.

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Q. Which of these is not a method to determine the number of colonies of bacteria present in a sample?

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