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Texas Basic Waste Water Operations Ch#07 Sedimentation - Statistics
General Stats
- This quiz has been taken 20 times
- The average score is 14 of 21
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| Imhoff tanks are ________ story units with ________ compartments. | 2/3 | 100%
|
| Common design features of a sedimentation tank include baffles, a skimmer, a grease ring, and a sludge rake. | True | 100%
|
| Withdraw sludge slowly or water will break through the sludge layer, ________ the sludge. | diluting | 80%
|
| Floating sludge or excessive gas bubbles indicate a failure of the return sludge pump, sludge rake, or poor ________ schedule. | pumping | 80%
|
| If the skimmer fails, the sludge ________ fails. | rake | 80%
|
| The four settling zones in a sedimentation tank are the inlet zone, settling zone, sludge zone, and the outlet zone. | True | 80%
|
| Short-circuiting is the uneven flow of water through a tank. | True | 80%
|
| Secondary sludge contains more water than primary sludge. | True | 80%
|
| Control foaming by controlling industrial waste, ________, and controlling pH with lime. | wasting small amounts of sludge | 80%
|
| Usual blanket depth in a secondary clarifier is no more than ________ of the sidewall depth. | 1/4 | 60%
|
| When sludge in an Imhoff tank is near ________ inches of the slot, withdraw sludge. | 18 | 60%
|
| ________ prevents septic solids from collecting and rising in the settling chamber. | Chaining | 60%
|
| A primary clarifier settles biological sludge, and a secondary clarifier settles raw sludge. | False | 60%
|
| Primary clarifiers should remove 90–95% of the BOD and 35% of the settleable solids. | False | 60%
|
| A trapped slot in the bottom of the settling compartment permits ________ solids to pass into the digester, but prevents septic solids from ________ into the settling compartment. | settled/rising | 60%
|
| Gas vents alongside the settling tank are the ________ compartment. | third | 60%
|
| The ________ compartment of an Imhoff tank is the settling tank, and the ________ compartment is the sludge digester. | upper/lower | 60%
|
| The settling compartment provides a detention time of about ________ hour(s). | 2 | 40%
|
| Foaming can be caused by industrial waste, drawing too much sludge, low pH, and restricted ________. | gas vents | 40%
|
| Sedimentation is the process of separating a suspended solid from water by atmospheric pressure. | False | 20%
|
| Factors affecting settling include solid weight, water temperature, detention time, velocity, surface loading, wastewater condition, and short-cutting. | False | 20%
|
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