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| Experimental study on treatment of rural domestic sewage by four substrates anaerobic baffled reactorvertical flow wetlands (ABR-VFW) |
| Received:October 24, 2017 |
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| KeyWord:anaerobic baffled reactor-vertical flow wetland;pollution load;matrix;purification effect |
| Author Name | Affiliation | E-mail | | LIU Juan | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | XIE Xue-dong | Environmental Protection Bureau of Suining City, Suining 629006, China | | | ZHANG Yang | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | LEI Ping | College of Resources and Environment, Southwest University, Chongqing 400715, China
College of Urban and Rural Construction, Mianyang Teachers'College, Mianyang 621000, China | | | GU Ru-xin | College of Resources and Environment, Southwest University, Chongqing 400715, China | | | NI Jiu-pai | College of Resources and Environment, Southwest University, Chongqing 400715, China | nijiupai@163.com |
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| Abstract: |
| In order to select optimal substrates for artificial vertical flow wetlands(VFW)that are used to filter domestic sewage with varying levels of pollution, four common substrates(i.e., shale debris, volcano ash, biological porcelain, and anthracite)were used to construct anaerobic baffled reactor(ABR)-VFWs. Hydraulic load was set uniformly to be 4.2 m3·m-2·d-1. The effects of the four substrates were analysed on three pollution loadings(low, medium, and high concentration)in terms of the chemical oxygen demand(COD), total nitrogen(TN), total phosphorus(TP), and ammonium nitrogen(NH4+-N)of rural domestic sewage. The shale debris substrate reduced the COD of the low, medium, and high-pollution sewage by 88.12%~95.78%, 64.05%~84.09%, and 61.25%~74.07%, respectively, and the TN by 51.98%~55.98%, 38.52%~50.84%, and 47.42%~53.22%, whereas the anthracite and volcano ash substrates were less effective, and the biological porcelain was the least effective. In contrast, the biological porcelain substrate removed NH4+-N and TP from the rural domestic sewage at significantly higher rates than the other substrates. Therefore, shale debris are the most effective substrate for purifying rural domestic wastewater with high COD or TN, whereas biological porcelain is the most effective substrate for purifying wastewater with high TP or NH4+-N. |
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