 
			 
			MCQOPTIONS
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				| 1. | What is the solid retention time assumed when the sludge constituting biosolids is treated anaerobically?$ | 
| A. | 7 days | 
| B. | 4 days | 
| C. | 15 days | 
| D. | 10 days | 
| Answer» D. 10 days | |