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5 Cards in this Set
- Front
- Back
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Which of the following is characteristic of normal raw municipal wastewater? a) strong acidic odor b) gray color c) low temperature compared to ambient temperature d) minimum daily flow occurring in the afternoon |
Gray color Typical municipal raw wastewater appears gray because of the soluble pollutants in the waste stream |
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A significant increase in wastewater temperature for a short period of time typically indicates the presence of ______. a) stormwater inflow b) groundwater infiltration c) extremely high ambient temperature d) an industrial discharge |
An industrial discharge A significant increase in temperature for a short period of time typically indicates the presence of a high-temperature industrial discharge |
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Which type of foam is caused by the filamentous organism Nocardia? a) stiff white foam b) light brown foam c) greasy dark-tan foam d) very dark black foam |
Greasy dark-tan foam Water resource recovery facilities with a significant quantity of the filamentous bacteria will have a greasy dark-tan foam that will get trapped wherever overflow outlet structures are not present |
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When septic conditions occur in the collection system, what physical characteristics of raw wastewater will be observed? a) low suspended solids concentration and methane production b) dark color and hydrogen sulfide odor c) higher temperature and low flow rate d) high turbidity and foams produced |
Dark color and hydrogen sulfide odor Septic influent wastewater will appear dark in color and have a "rotten egg" odor because of the presence of hydrogen sulfide |
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A potential cause of the presence of clear supernatant above poor settling sludge in a secondary clarifier is _________. a) very low food-to-microorganism ratio b) excessive dissolved oxygen concentration c) high nutrient levels d) too high influent biochemical oxygen demand concentration |
Very low food-to-microorganism ratio The presence of clear supernatant above poorly settling sludge indicates that settling s being hindered by the presence of filamentous microorganisms. An overgrowth of filamentous microorganisms an be caused by a low food-to-microorganism ratio, low dissolved oxygen conditions, a nutrient deficiency or low pH. |
