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| Removal mechanism of ammonia nitrogen in bio-purification process for high iron and manganese removal from low temperature groundwater |
| LI Dong1, CAO Rui-hua1, YANG Hang2, WANG Yan-ju1, ZENG Hui-ping1, ZHANG Jie1,2 |
1. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China |
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Abstract The removal mechanism of ammonia nitrogen (NH4+-N) was analyzed about "two-stage aeration and two-stage filtration" process that was used to remove high iron (Fe2+>8.0mg/L),manganese (Mn2+>3.0mg/L) and NH4+-N (>3.0mg/L) from low temperature (5~7.8℃) groundwater in a drinkingwater plant.The experiments showed that there was 45.22% and 35.97% nitrogen losses (TNloss) in the primary and secondary filter columns,respectively,and the actual DO consumption was 24.67% and 22.27% lower than the theoretical DO consumption.Moreover,the TNloss process was proved to be accompanied with DO consumption by DO measurement relationship.There was a good linear relationship between TNloss and its DO consumption,R2>0.970.The analysis demonstrated that autotrophic nitrogen removal (N-removal) was the cause of TNloss,which was independent on the adsorption,biological assimilation,heterotrophic denitrification and manganese oxidative coupling denitrification.The calculation based on quantitative relationship between nitrogen conservation and DO measurement indicated that the contribution of autotrophic N-removal to NH4+-N removal was 51.40% and 40.93% in the primary and secondary filter columns,respectively.Both the nitrification reaction and the autotrophic N-removal process were the significant removal mechanism of NH4+-N.Moreover,with the higher concentration of NH4+-N,the contribution of autotrophic N-removal was also higher.
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Received: 24 November 2016
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