Q. The longer the water is held in the tank, the better the treatment.

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Q. Large amount of wastewater constantly produced _________ the treatment time of wastewater in a septic tank.

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Q. ______ is called effluent.

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Q. What is the common effluent pipe from each house to a collection point called?

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Q. ______ allow the water to soak into the ground.

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Q. Oil and grease is the presence of inorganics in wastewater.

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Q. The surfactants have ______ chains.

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Q. Lipophilic end is water liking.

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Q. The lipophilic end ______

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Q. What is the size of the oil droplets?

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Q. What is the colour of the emulsion?

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Q. What is the size of dissolved oil droplets?

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Q. _________ act as a coupling agent between oil oil/water phases.

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Q. An emulsion is a _____ system.

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Q. Surfactants and finely divided solids _____the stability of the emulsion.

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Q. Organo clays are manufactured by modifying _____with quaternary amines.

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Q. What is the range of charge present on bentonite?

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Q. The design of oil/water separators is based on _________

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Q. Compute the required pressure for the flotation thickener without recycle for the following information:

A/S = 0.008 mL/mg
Temperature: 20 degree Celsius
Air solubility: 18.7 mL/L
Recycle steam pressure: 275 kPa
Fraction of saturation: 0.5
Surface Loading rate: 8 L/m²/min
Sludge flow rate: 400 m³/d

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Q. Determine the surface area for the following information.

A/S = 0.008 mL/mg
Temperature: 20 degree Celsius
Air solubility: 18.7 mL/L
Recycle steam pressure: 275 kPa
Fraction of saturation: 0.5
Surface Loading rate: 8 L/m²/min
Sludge flow rate: 400 m³/d

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