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| Effects of plants harvesting on polycyclic aromatic hydrocarbons removal of constructed wetland |
| YANG Hai-yan1, GUO Jin-peng1,2, LU Shao-yong1,2, BI Bin2, CAO Feng-mei2, JIA Jiu-min1 |
1. School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2. Engineering and Technology Centre of Lake, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Research Centre of Lake Environment, State Environmental Protection Key Laboratory for Lake Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract Effects of plants harvesting on PAHs removal rate of constructed wetland were studied by simulating the water quality of Qinghe river in Beijing. Plant and substrate on PAHs removal both have certain contribution. In the wetland planted and added substrate, the removal rate of naphthalene(2rings),phenanthrene(3rings), pyrene (4rings) and benzo [a] pyrene (5rings) increased by 34.82%, 47.92%, 19.70% and 47.92% on average. After harvesting of wetland plants, naphthalene, phenanthrene, pyrene and benzo [a] pyrene removal increased 11.31%, 10.42%, 21.21%, and 12.22%, respectively, and the maximum of the second cycle was achieved. After the plant harvested, the relative growth rate of first cycles was lowest (0.03~0.04cm/day), the relative growth rate of second cycles was the highest (0.47~0.51cm/day), the relative growth rate of the fourth cycle returned to normal levels (0.17~0.23cm/day); and the removal rate of PAHs in the fourth cycle returned to normal levels.
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Received: 10 November 2015
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