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| Nitrogen removal performances and mechanisms in a two-stage soil infiltration system by shunt distributing wastewater |
| LI Dan1, WANG Xin-ze1, SHEN Jian1, FENG Ji-meng2, TONG Xin-nan1, LIU De-cai3, YANG Ming3, ZI Jian-ting3 |
1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China;
3. Yunnan Dali Research Institute of Shanghai Jiao Tong University, Dali 671000, China |
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Abstract In order to solve the problem of large footprints of traditional soil infiltration systems, a two-stage soil infiltration system consisting of a multi-soil-layering (MSL) system and a subsurface wastewater infiltration (SWI) system was developed. The influences of different shunt ratios on nitrogen removal performances were investigated under a high hydraulic loading rate (HLR) of 0.3m/d. And the abundances of nitrogen functional genes in different layers were also analysed by real-time quantitative PCR for further disclosing the nitrogen removal mechanisms. The results showed that the shunt distributing wastewater certainly improved the nitrogen removal under high HLRs. The optimal removal efficiencies of 91.16% for COD, 96.91% for TP, 72.11% for NH4+-N and 72.27% for TN were obtained in the system with shunt ratio of 1:2. Furthermore, the study on nitrogen functional genes indicated that nitrification and anammox in the MSL system coupled with nitrification and denitrification in the SWI system were the main nitrogen removal pathway in the two-stage soil infiltration system.
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Received: 11 July 2018
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