Q. What is the ideal mixing time required for polymers?

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Q. Addition of which of these result in lowering the BOD level?

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Q. At what pH is the solubility of FePO₄ minimum?

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Q. At what pH is the solubility of AlPO₄ minimum?

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Q. What is the ratio of Alum/Phosphate while adding alum to a waste water in order to remove the phosphates present?

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Q. What is the test used to select the type of coagulant required?

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Q. 1 micrometer = _______

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Q. What is the chemical formula of aluminium sulphate?

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Q. The clustered particles formed in the presence of a flocculant are called ______

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Q. What is the movement of solids in water called?

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Q. How many types of solids are present in water?

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Q. What is the other name for deflocculation?

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Q. A process of contact and adhesion whereby the particles of a dispersion form larger-size clusters is called ________

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Q. Determine the size of a flash mixer for the following data. Round off to the nearest digit.
Flow rate: 2200 m³/hr

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Q. What is the detention time assumed while designing a flash mixer?

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Q. Calculate the size of the tank for the below given data. Round off to the nearest 1000 digit.

Flow rate: 440lph
Retention time: 17 hrs

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Q. Calculate the volume of lime to be dosed for the below given data. Round it off to the nearest digit.

Flow rate: 2200m³/hr
Dosage: 25 ppm
Specific gravity: 1.12
Concentration: 10%

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Q. Calculate the dosage rate for the following data.

Flow rate: 2200m³/hr
Dosage: 100 ppm

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Q. At which point, chemical addition for phosphorous removal can’t be carried out?

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Q. Name the compound formed when lime is added in order to precipitate phosphate.

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