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Site test of phytoremediation of an open pond contaminated with domestic sewage using water hyacinth and water lettuce

文献类型： 外文期刊

作者： Qin, Hongjie 1 ; Zhang, Zhiyong 1 ; Liu, Minhui 1 ; Liu, Haiqin 1 ; Wang, Yan 1 ; Wen, Xuezheng 1 ; Zhang, Yingying 1 ; Y 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjng 210014, Jiangsu, Peoples R China

关键词： Domestic sewage;Nutrients removal;Phytoremediation;Rhizofiltration;Water hyacinth;Water lettuce

期刊名称：ECOLOGICAL ENGINEERING （ 影响因子：4.035； 五年影响因子：4.611 ）

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收录情况： SCI

摘要： This study was undertaken in situ to explore the potential of the alien plants water hyacinth (Eichornia crassipes) and water lettuce (Pistia stratiotes L.) as phytoremediation aquatic macrophytes for nutrients (nitrogen and phosphorus) removal and algal interception from domestic sewage contaminated pond (approximately 10500 m(2) in area, average 2.5 m in depth) by using self-designed experimental devices from July 7 to August 8 in 2015. The physicochemical properties of water and plant samples as well as N and P mass balance in the phytoremediation system were investigated. The range of physicochemical parameters of influent were shown as follows: water temperature (WT: 24.5 degrees C-31.0 degrees C), pH (6.94-8.25), DO (4.58 mg L-1-15.73 mg L-1), CODMn (5.00 mg L-1-13.15 mg L-1), TN (1.60 mg L-1-5.60 mg L-1) and TP (0.16 mg L-1-0.73 mg L-1). Water hyacinth, which exhibited hyperactive accumulating capacity for nitrogen (58.64% of total reductions), was more suitable than water lettuce for the intensive purification of domestic sewage with high nitrogen concentrations. This result may be attributed to the larger total root surface area (0.97 m(2) g(-1)-1.10 m(2) g(-1) fresh weight), active absorption area (0.31 m(2) g(-1)-0.36 m(2) g(-1) fresh weight), and leaf area and higher root activity (71.79 mu g g(-1) h(-1)-98.34 g g(-1) h(-1)), root biomass (kg m(-2)), and net photosynthetic rate (20.28 mu mol CO2 m(-2) S-1) of water hyacinth than those of water lettuce regardless of cultivation in oligotrophic water with total nitrogen contents lower than 1.0 mg L-1. Water lettuce exhibited a higher total phosphorus removal efficiency, which benefitted higher P accumulation, adsorption, and precipitation because of its longer roots (approximately 49.0 cm) with higher rhizofiltration capacity. As such, water lettuce achieved higher algal (96.36%) and chlorophyll a (96.65%) removal efficiencies. A combined pattern using both macrophytes was recommended for the phytoremediation of most domestic sewages containing dual contaminants (N and P) in the future. (C) 2016 Published by Elsevier B.V.

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