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Texas Basic Waste Water Operations Ch#03 Waste Water Characteristics - Statistics
General Stats
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This quiz has been taken 28 times
12 since last reset
- The average score is 29 of 34
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| Each person contributes about ________ lbs of BOD daily. | 0.17 | 100%
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| Good sampling results depend on ________. | all of the above | 100%
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| When dissolved oxygen is present, it indicates the wastewater is ________. | fresh | 100%
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| A ________ sample is collected at any point, at any time. | grab | 100%
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| Dangerous gases produced during the breakdown of organics in wastewater are hydrogen sulfide, carbon dioxide, and ________. | methane | 100%
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| The dissolved oxygen test must be performed as soon as a sample is taken because oxygen levels can ________ change. | quickly | 100%
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| Hydrogen sulfide has a ________ odor, is combustible in air, and is very toxic. | rotten egg | 100%
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| Because wastewater is mostly water, it weighs 8.34 lbs/gal. | True | 100%
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| Wastewater characteristics are divided into 3 primary groups: bacteriological, physical, and chemical. | True | 100%
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| Some bacteria cause disease and are called pathogens. | True | 100%
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| One way to classify bacteria is by their oxygen use: aerobic, facultative, and anaerobic. | True | 100%
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| Facultative bacteria live with free oxygen or chemically combined oxygen. | True | 100%
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| Fresh domestic wastewater contains dissolved oxygen. | True | 100%
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| Some chemical characteristics of wastewater include solids, grease, DO, pH, and gases. | True | 100%
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| Suspended solids can be filtered out, and dissolved solids pass through a filter. | True | 100%
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| Two other classifications of solids are inorganic (ash) and organic (volatile). | True | 100%
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| Organic solids are volatile, combustible solids found by burning the residue from the total solid test or the filter from the TSS test. | True | 100%
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| The pH scale ranges from ________ to ________, with 7 being neutral. | 0/14 | 80%
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| The BOD test measures oxygen consumed as organics are oxidized by biological and chemical action during incubation for ________ days at ________°C. | 5/20 | 80%
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| ________ water has a pH below 7.0, while ________ water has a pH above 7.0. | Acidic/basic | 80%
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| The ________ test measures the oxygen depleting effect of the wastewater upon the receiving stream. | BOD | 80%
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| The three primary types of organics are ________, proteins, and grease. | carbohydrates | 80%
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| ________ is odorless, colorless, heavier than air, and not combustible. | Carbon dioxide | 80%
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| As the water temperature rises, the DO saturation level will ________. | decrease | 80%
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| ________ in raw wastewater comes from the water supply. | Dissolved Oxygen(DO) | 80%
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| Anaerobic bacteria cannot live when chemically combined oxygen is present. | False | 80%
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| Septic wastewater is dark, has agreeable odor, and contains dissolved oxygen. | False | 80%
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| Select a point where ________ is thorough and the wastewater quality is uniform. | mixing | 80%
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| The ________ decomposition of organic matter produces methane which is colorless, odorless, and explosive. | anaerobic | 60%
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| A ________ sample consists of several portions collected at intervals, then mixed together. | composite | 60%
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| Labs report many characteristics of wastewater as milliliters per liter (ml/L). | False | 60%
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| When a sample of a plant unit influent is collected at any time, and a sample of the effluent is collected corresponding to the unit’s detention time, the sample is a ________. | timed grab | 60%
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| The ash (fixed solids) left after burning consists of inorganic solids. | True | 60%
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| Settleable solids are dissolved solids of sufficient weight to settle when left standing for a time. | False | 40%
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