Abstract
Effect of placement pattern and quantity of iron shavings in reactor on biological nutrient Removal from domestic wastewater was conducted. The results indicate that: different placement pattern had obvious effect on TP removal, but had no distinct effect on TN removal; when iron was placed beside aerator, the highest TP removal can be obtained. Adding more iron can just slightly enhance TP and TN removal when iron shaving quantity increased from 5 g to 20 g per 900 ml wastewater; iron adding restrained transfer of ammonia to nitrate by microbe and this defect should be overcome in practice; 5 g iron per 900 mL is the best choice to balance good nutrient removal and low cost.
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