CA Water Treatment Chapter 5
- 1.Smaller sized particles, such as bacteria and fine clays andsilts, readily settle out of water.
- A.
True
- B.
False
- 2.The theory of coagulation is very simple.
- A.
True
- B.
False
- 3.The operator has effective control over the pH and alkalinity of the source water.
- A.
True
- B.
False
- 4.Overdoing as well as underdosing of coagulants may lead to reduced solids removal efficiency.
- A.
True
- B.
False
- 5.Coagulation is slow stirring process that causes the gathering together of small, coagulated particles into larger, settleable particles.
- A.
True
- B.
False
- 6.The solids-contact process (upflow clarifiers) combine the coagulation, flocculation, and sedimentation processes into a single basin.
- A.
True
- B.
False
- 7.The measurement of filtered water turbidity will give theoperator a good indication of overall process performance.
- A.
True
- B.
False
- 8.Visual observations and laboratory tests of coagulation-flocculation process performance should be performed on a routine basis.
- A.
True
- B.
False
- 9.The jar test exactly duplicates the flow-through conditions that are occurring in your treatment plant.
- A.
True
- B.
False
- 10.A good practice is to prepare jar test reagents using samples of the chemicals actually used in the plant, rather than reagent grade chemicals.
- A.
True
- B.
False
- 11.Most of the sludge volume from the coagulation-flocculation process consists of precipitates of the added chemicals rather than suspended solids (turbidity) removed.
- A.
True
- B.
False
- 12.After evaluation of the jar test results, apply the dosage used to achieve the best jar test results to your water treatment plant operation
- A.
True
- B.
False
- 13.If the water has milky appearance of a bluish tint, the alum dose is probably too high.
- A.
True
- B.
False
- 14.Excessive mixing speeds, mixing time, and the buildup of heat can break down the polymer chain and reduce its effectiveness.
- A.
True
- B.
False
- 15.The colloidal and dissolved organics found in some natural waters are the end products of decayed vegetable matter.
- A.
True
- B.
False
- 16.In the enhanced coagulation process, optimum dosages for acid, alkalinity, and coagulant are determined by performing a series of jar test.
- A.
True
- B.
False
- 17.Do not allow any untreated water to flow through your plant.
- A.
True
- B.
False
- 18.Good records of actions taken during start-up/shutdown operations will assist the operator in conducting future start-ups/shutdowns.
- A.
True
- B.
False
- 19.Samples should be analyzed as soon as possible after the sample is collected.
- A.
True
- B.
False
- 20.Good record keeping is the key to a successful preventive maintenance program.
- A.
True
- B.
False
- 21.What are polymers?
- A.
Long chain molecules formed by the union of many monomers
- B.
Very small, finely divided solids that remain dispersed in a liquid for a long time due to their small size and electrical charge
- C.
Very small solids suspended in water which can vary widely in size, shape, density, and electrical charge
- D.
Very small solids that settle out of the water being treated
- 22.What is the purpose of coagulation and flocculation?
- A.
To control corrosion
- B.
To filter out suspended particles
- C.
To remove particulate impurities, especially nonsettleable solids, and color from the water being treated
- D.
To settle our larger suspended particles
- 23.What is alkalinity?
- A.
A laboratory procedure used to estimate the minimum or ideal coagulant dose required to achieve certain water quality goals
- B.
A process used to kill disease-causing organisms
- C.
A solution or liquid whose chemical makeup neutralizes acids or bases without a great change in pH
- D.
The capacity of water to neutralize acids
- 24.What is the purpose of the flocculation process?
- A.
To clarify the water being treated prior to treatment by the sedimentation and filtration processes
- B.
To create a floc of a good size, density, and toughness for later removal in the sedimentation and filtration processes
- C.
To flocculate the water being treated in a timely manner
- D.
To prevent solids settling out in the flocculation basin
- 25.What is the most important consideration in coagulation-flocculation process control?
- A.
Adjusting the alkalinity
- B.
Keeping the floc in suspension
- C.
Maintaining a constant pH
- D.
Selection of the proper type and amount of coagulant chemical(s) to be added to the water being treated
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