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30 Cards in this Set
- Front
- Back
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1. A shock load is unusually strong wastewater discharged from a waste source. |
a. true |
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2. Wastewater is channeled to the collection system from the source, then to the treatment |
a. true |
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3. Septic wastewater is easy to treat, but fresh wastewater is difficult to treat and results in |
b. false...
Septic wastewater (containing no dissolved oxygen) is DIFFICULT to treat...
Fresh wastewater (containing dissolved oxygen) is EASIER to treat and results in higher quality effluent |
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4. The amount of wastewater collected depends on economic status, water rates, climate, |
a. true |
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5. When industry has its own water supply and discharges wastewater to the city collection
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b. false
The city's wastewater volume increases in proportion to the amount of water supplied by the industry |
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b. false Increased flow and BOD (Biological Oxygen Demand) introduced by Garbage grinders INCREASES line septicity (depleted oxygen) and plant loading |
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7. The four categories of wastewater characteristics are physical, chemical, bacteriological,
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a. true |
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8. Physical characteristics are detected by the senses such as smell and sight.
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a. true |
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9. Fresh domestic wastewater is black in color, has a strong fecal odor, suspended particles
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b. false
Fresh domestic wastewater: Is Gray in color. Has a strong fecal odor. Has suspended particles that maybe difficult to see. Contains dissolved oxygen. |
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10. When dissolved oxygen is gone, anaerobic decomposition begins producing acid and
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a. true |
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11. Hot water contains more dissolved oxygen than cool water. |
b. false
Less dissolved oxygen than cool water |
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12. One mg/L or one ppm is one pound of material in a million pounds of water. |
a. true |
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13. Wastewater is approximately 9.99% water, 0.1% solids, and a small amount of gas. |
b. false wastewater is 99.9% water (not 9.99%) 0.1% solids And a small amount of gas |
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14. Suspended solids can be removed by filtration, but dissolved solids pass through a filter. |
a. true |
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15. Organics are produced by plants, animals, or humans. |
a. true Organic Matter is living or once lived. However today, Organic matter is any compound with carbon-based structure containing Hydrogen and natural or synthetic compounds, such as plastic. |
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16. “Inorganic” means not organic and examples are sand, metal, and rock. |
a. true |
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17. The pH scale ranges from 1-14 and measures the hydrogen ion concentration in water, |
b. false The correct range for the pH scale is 0-14 |
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18. A pH of 7 is neutral and below 7 is a base, above 7 is an acid. |
b. false If pH levels are: Below 7.0 is an Acid At 7.0 is Neutral Above 7.0 a Base |
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19. Hydrogen sulfide is toxic, corrosive, flammable, heavier than air, deadens the sense of smell, and has a rotten egg odor. |
a. true Hydrogen Sulfide (H2S) is also colorless |
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20. Carbon dioxide has no color or odor, is suffocating, corrosive, heavier than air, and |
b. false Carbon Dioxide(CO2) IS NOT Flammable... But it is... Colorless Odorless Has a Suffocating effect Corrosive Is 1.5 times heavier than air has a TLV (Threshold Limit Value for an 8 hour work day) of 0.5% (5000ppm) 40,000 ppm is immediately dangerous to life and health. |
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21. Methane (natural) gas is lighter than air, explosive, colorless, and odorless. |
a. true Methane (CH4) is the major component of Natural Gas. |
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22. Oil and grease in wastewater may cause ________. |
e. all listed |
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23. Excessive chlorides interfere with treatment and effect wastewater ________. |
d. lab tests Chlorides (CI) mostly come from common salt and generally remain the same in wastewater. Most salt comes from body waste. A change in concentration can indicate intrusion by industrial waste or salt water. |
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24. The BOD test indicates the amount of organic matter that can be oxidized by biological and |
c. 5/20 BOD (Biochemical Oxygen Demand) test measures wastewater strength and the oxygen depleting effects of wastewater effluent (an outflow) into the receiving stream. |
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25. Bacteria requiring free, uncombined oxygen are ________. |
a. aerobic Aerobic wastewater (has bacteria that requires free, uncombinded oxygen) Bacteria are only seen with a microscope and are in the air,soil, water and food. It also can be found in decaying organic matter and intestinal tract of man and animals. |
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26. Bacteria requiring combined oxygen are ________. |
b. anaerobic Anaerobic wastewater (has bacteria that requires combinded oxygen) |
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27. Bacteria able to metabolize free or combined oxygen are ________. |
c. facultative Facultative wastewater, has bacteria that can metabolize free oxygen or combined oxygen |
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28. Disease-causing microorganisms are called ________. |
b. pathogens |
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29. Waterborne diseases include typhoid, dysentery, cholera, and ________. |
c. polio Waterborne diseases include Typhoid Dysentery Cholera Polio Hepatitis |
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30. Types of industrial waste are flammable oil, toxic gases, and _________. a. sand and grit b. aerobics and anaerobics c. DO and water d. acids and alkalis |
d. acids and alkalis Other industrial waste can be... Flammables Toxic gases like Hydrogen Sulfide (H2S) |
