 
			 
			MCQOPTIONS
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				| 1. | At which point, chemical addition for phosphorous removal can t be carried out? | 
| A. | tPreliminary treatment | 
| B. | tPrior to primary sedimentation tank | 
| C. | tPrior to secondary treatment | 
| D. | tAfter secondary treatment | 
| Answer» B. tPrior to primary sedimentation tank | |