 
			 
			MCQOPTIONS
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				| 1. | The form of sludge which is free from pathogenic bacteria is ___________ | 
| A. | Undigested sludge | 
| B. | Digested sludge | 
| C. | Primary sludge | 
| D. | Supernatant liquor | 
| Answer» C. Primary sludge | |