Nitrogen removal from Lake Caohai, a typical ultra-eutrophic lake in China with large scale confined growth of Eichhornia crassipes
文献类型: 外文期刊
作者: Wang, Zhi 1 ; Zhang, Zhiyong 1 ; Zhang, Yingying 1 ; Zhang, Jungian 1 ; Yan, Shaohua 1 ; Guo, Junyao 1 ;
作者机构: 1.Jiangsu Acad Agr Sci, Inst Agr Resource & Environm, Nanjing 210014, Jiangsu, Peoples R China
2.Chinese Acad Sci, Inst Geodesy & Geophys, Key Lab Environm & Disaster Monitoring & Evaluat, Wuhan 430077, Peoples R China
3.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
关键词: Eutrophication;Lake;Nitrogen;Water hyacinth
期刊名称:CHEMOSPHERE ( 影响因子:7.086; 五年影响因子:6.956 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: An ecological engineering project, with large-scale utilization of Eichhornia crassipes (coverage area ~4.3 km~2) for pollution control in an open ultra-eutrophic lake, Lake Caohai, was first implemented in 2011. In this study, the efficiency of N removal using E crassipes in the lake was evaluated. After E. crassipes was planted in May, the concentrations of TN and NH_4~+ in Waicaohai, the main part of Lake Caohai, were significantly decreased within a month, and then, remained stable from June to November, 2011, although the lake had received waste water continuously from river inlets. The average concentrations of TN, NH_4~+-N and NO_3~--N in water of Xi Yuan Channel (outlet) were reduced to 3.3,0.02 and 0.8 mg L~(-1) from 13.8,4.7 and 5.8 mg L~(-1) in river inlets, respectively. The DO levels in 2011 were not decreased, but concentrations of TN and NH_4~+ were significantly reduced when compared with the historical data from 2007 in the lake. Assimilation by E. crassipes was the main pathway to remove N in Lake Caohai, accounted for 52% of the total N influent (936t), or 64% of the removed N (761t). These results indicated that large scale utilization of E. crassipes for removal of N in the eutrophic lake is practicable.
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