McqMate
| 201. |
From which of the following methods can toxic chemicals be removed? |
| A. | Sorption |
| B. | Adsorption |
| C. | Absorption |
| D. | Dewatering |
| Answer» A. Sorption | |
| 202. |
What is the term used for reuse of sewage sludge? |
| A. | Compost |
| B. | Solids |
| C. | Biosolids |
| D. | Sludge |
| Answer» C. Biosolids | |
| 203. |
In which year was the term Biosolids introduced? |
| A. | 1990 |
| B. | 1995 |
| C. | 1998 |
| D. | 2000 |
| Answer» C. 1998 | |
| 204. |
What is the first step in the sewage treatment process? |
| A. | Dewatering |
| B. | Thickening |
| C. | Phosphorus recovery |
| D. | Digestion? |
| Answer» B. Thickening | |
| 205. |
What is the amount of solids released into wastewater by human beings? |
| A. | 30 gpcd |
| B. | 40 gpcd |
| C. | 60 gpcd |
| D. | 70 gpcd |
| Answer» D. 70 gpcd | |
| 206. |
What is the percentage of aerobically digested sludge? |
| A. | 0.2-0.5 |
| B. | 0.3-0.6 |
| C. | 1.0-2.0 |
| D. | 1.5-3.0 |
| Answer» C. 1.0-2.0 | |
| 207. |
Ws = Wsp + Wss What does Wsp stand for in the above equation? |
| A. | Total dry solids |
| B. | Raw primary solids |
| C. | Suspended solids |
| D. | none |
| Answer» B. Raw primary solids | |
| 208. |
Sludge from the primary clarifier is ______ |
| A. | Brown and flocculant like appearance |
| B. | Dark in colour |
| C. | Gray and slimy |
| D. | Dark brown in colour |
| Answer» C. Gray and slimy | |
| 209. |
How does the chemical sludge appear? |
| A. | Gray in colour and not slimy |
| B. | Brown and flocculant like appearance |
| C. | Red/grayish brown |
| D. | Black in colour |
| Answer» C. Red/grayish brown | |
| 210. |
How does the activated sludge appear? |
| A. | Gray |
| B. | Red |
| C. | Brown and flocculant like appearance |
| D. | Greasy |
| Answer» C. Brown and flocculant like appearance | |
| 211. |
What is the % of dry solids assumed for a primary sludge from a settling tank at the outlet? |
| A. | 12% |
| B. | 5-7% |
| C. | 8% |
| D. | 9-11% |
| Answer» B. 5-7% | |
| 212. |
What is the percentage of dry solids assumed for the sludge at the outlet of a centrifuge? |
| A. | 10-15% |
| B. | 1-3% |
| C. | 4-8% |
| D. | 9-12% |
| Answer» C. 4-8% | |
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