Note: 1gallon 3.785 liters 1kg#2.2 lbm 1m=3.28ft ft 7.48 gallons m\'-1000 liters

Question

Note: 1gallon 3.785 liters 1kg#2.2 lbm 1m=3.28ft ft 7.48 gallons m'-1000 liters 1 ft 12 in. Questions 1 through 9 each carry 1 Point 1. The term flocculation in water treatment refers to (a) slow mixing of the water with chemicals b) complete destruction of pathogenic bacteria (c) periodic cleaning of rapid sand filters (d) metabolism of organic waste by bacteria (e) injection of compressed air to increase DO levels 2. The process of adding chemicals to water to ald in sedimentation is (a) bio-precipitation (b) coagulation (c) disinfection (d) aeration (e) softening Compared to groundwater water, surface water usually contains more (a) dissolved minerals (b) microorganisms (c) dissolved minerals (d) fluorides (e) hydrogen sulfide What is the purpose of coagulation and flocculation? a. control corrosion b. to kill disease causing organisms c. to remove leaves, sticks, and fish debris d. to remove particulate impurities and suspended matter

Explanation / Answer

1. (a) Slow mixing of the waterwith chemicals

2. (b) coagulation

3. (b) microorganism

4. (d) to remove particulate impurities and suspended matter

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