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| Purification effect of biochar baffled wetland on domestic sewage |
| Received:March 10, 2020 |
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| KeyWord:baffle wetland;biochar;hydraulic retention time;first-order kinetic model |
| Author Name | Affiliation | | WANG Ruo-fan | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | WANG Wen-fei | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | WANG Yu-jun | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | SUN He-zhou | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China | | LIU Ao-zhan | School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China |
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| Abstract: |
| :In order to speed up the treatment of rural domestic sewage in northwest China, this study combined with the characteristics of anuual average temperature, constructed a baffled wetland using biochar as the main body, and its degradation effect on pollutants in domestic sewage was analyzed. The results showed that the optimal hydraulic retention time(HRT)of the baffled wetland was 2.5 d at 8~12℃. During this time, the removal rates of chemical demand(COD), ammonia nitrogen(NH4+-N), phosphate(PO43--P), and suspended solids(SS)in the wetland were 90.51%, 72.38%, 90.73%, and 94.57%, respectively. In addition, the respective pollutant removal rate was significantly positively correlated with their residence time(P<0.05). After 12 months of wetland operation, the average annual removal efficiency of COD, NH4+-N, PO43--P, and SS were 88.16%, 83.16%, 92.55%, and 96.30%, respectively, and the effluent quality was stable. Biochar, a baffled wetland filler, biochemically degraded COD, PO43--P, and SS. Further, the data fitted the first-order kinetic model with R2 greater than 0.91, and the fastest degradation rate was observed for SS. Therefore, the results show that the use of biochar as a filler in baffled wetlands is of good application value and is of great significance for solving rural water pollution problems in northwestern China. |
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