Nitrogen removal from Lake Caohai, a typical ultra-eutrophic lake in China with large scale confined growth of Eichhornia crassipes.
Nitrogen removal from Lake Caohai, a typical ultra-eutrophic lake in China with large scale confined growth of Eichhornia crassipes.
复制标题
DOI：
10.1016/j.chemosphere.2013.03.014
复制
发表时间：
2013-06
期刊：
影响因子：
8.8
通讯作者：
Zhi Wang;Zhiyong Zhang;Yingying Zhang;Junqian Zhang;S. Yan;Junyao Guo
中科院分区：
文献类型：
--
作者：
Zhi Wang;Zhiyong Zhang;Yingying Zhang;Junqian Zhang;S. Yan;Junyao Guo
2011年首次实施了一项利用凤眼莲（Eichhornia crassipes）（覆盖面积约4.3km2）治理开放型超富营养化湖泊草海污染的生态工程项目。在本研究中，利用E.湖泊中的crassipes进行了评估。在E. 2011年5月种植凤眼莲后，草海主体外草海的TN和NH 4+浓度在一个月内显著下降，之后在6 ~ 11月保持稳定，尽管该湖不断接受入湖污水。西园水道（出口）水体中TN、NH 4 +-N和NO3--N的平均浓度分别由入水口的13.8、4.7和5.8mgL − 1降至3.3、0.02和0.8mgL − 1。与2007年的历史数据相比，2011年的溶解氧水平没有下降，但总氮和氨氮浓度明显降低。同化E。水草是草海去除氮的主要途径，占进水总氮（936 t）的52%，占去除氮（761 t）的64%。这些结果表明，大规模利用E。凤眼莲对富营养化湖泊中氮的去除是可行的。
An ecological engineering project, with large-scale utilization of Eichhornia crassipes (coverage area ∼4.3km2) 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 NH4+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, NH4+–N and NO3-–N in water of Xi Yuan Channel (outlet) were reduced to 3.3, 0.02 and 0.8mgL−1from 13.8, 4.7 and 5.8mgL−1in river inlets, respectively. The DO levels in 2011 were not decreased, but concentrations of TN and NH4+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.