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| Comma Seperated Value File | 1990-10-16 | 645 b | 3 rows |
| # | What are ~sloughings?~ | Material settled out in grit channels | Material washed off trickling filter meia | Return activated sludge | Waste activated sludge | Waste sludge troughs | 2 |
|---|---|---|---|---|---|---|---|
| 1 | Hydrogen sulfide gives off an odor similar to | ammonia. | chlorine gas. | rotten eggs. | decayed wood. | none of the above. | 3 |
| 2 | Appreciable quantities of septic sludge ~burping~ to the surface of primary settling tanks may indicate | excessive activity of worms in sludge in the tank. | excessive sludge scraper speed. | grit chambers are not properly removing grit. | sludge not being pumped in suffiecient quantities. | none of the above. | 4 |