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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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