期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 153, 期 -, 页码 33-39出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2015.01.035
关键词
Constructed wetland; Baffle flow; Nutrient removal; Septic tank effluent
资金
- National Natural Science Foundation of China [41271245, 41071214]
- Engineering Research Center for Wastewater Ecological Treatment and Waterbody Remediation of Guangdong Higher Education Institutes [2012gczxA1004]
- Project of Science and Technology of Guangdong Province [2010B031800007, 2012A020100003]
- Project of Oceanic and Fisheries Administrator of Guangdong Province [B201001C03]
Three new baffle flow constructed wetlands (CWs), namely the baffle horizontal flow CW (Z1), baffle vertical flow CW (Z2) and baffle hybrid flow CW (Z3), along with one traditional horizontal subsurface flow CW (Z4) were designed to test the removal efficiency of nitrogen (N) and phosphorus (P) from the septic tank effluent under varying hydraulic retention times (HRTs). Results showed that the optimal HRT was two days for maximal removal of N and P from the septic tank effluent among the four CWs. At this HRT, the Z1, Z2, Z3 and Z4 CWs removed, respectively, 49.93, 58.50, 46.01 and 44.44% of TN as well as 87.82, 93.23, 95.97 and 9130% of TP. Our study further revealed that the Z3 CW was the best design for overall removal of N and P from the septic tank effluent due to its hybrid flow directions with better oxygen supply inside the CW system. (C) 2015 Elsevier Ltd. All rights reserved.
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