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| Removal of contaminants in a farmland catchment river by aquatic macrophyte on floating beds |
| Received:November 14, 2018 |
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| KeyWord:aquatic macrophyte;agriculture runoff;polluted river;nitrogen;phosphorus |
| Author Name | Affiliation | E-mail | | ZHANG Ying-ying | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China | | | WEN Xue-zheng | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China | | | YAO Yi-dan | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China | | | YANG Fei | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Energy and Environment, Southeast University, Nanjing 210096, China | | | WANG Yan | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China | | | LIU Hai-qin | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China | | | ZHANG Zhi-yong | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
China Ministry of Agriculture Key Laboratory at Yangtze River Plain for Agricultural Environment, Nanjing 210014, China | jaaszyzhang@126.com |
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| Abstract: |
| This study was designed to determine the efficiency of contaminants removal from a farmland catchment river via aquatic macrophytes growing on floating beds. A field experiment utilizing floating beds with Eichhornia crassipes(Mart.)Solms and Myriophyllum elatinoides Gaudich. was conducted in Sihong County, Jiangsu Province, China, from May to November in 2017. After plant cultivation, water samples were collected at 4 sites along the river. The physical and chemical indexes of the river, including temperature, pH, dissolved oxygen(DO), total nitrogen(TN), total phosphorous(TP), chemical oxygen demand(CODCr), and suspended solids(SS)were monitored every month during the experiment, to analyze changes in water quality along the river. Fresh weight, dry matter content, and N and P contents of the plants were monitored on May 11, June 11, August 7, September 13, and November 19, to calculate the amount of absorption of N and P in plant tissues. Based on the comparison of data among sampling points, pH tended to be neutral along the river. Based on the comparison of data of intermediate and initial period, DO concentration showed an increasing trend. During the vigorous growth phase of the aquatic plants(from July to October), the total removal rates of TN, TP, CODCr and SS in river water were 50.41%~78.00%, 44.62%~73.33%, 46.15%~57.82% and 33.33%~52.38% along the river, respectively, and the highest removal rates occurred in August. Based on calculations during the effective experimental cycle of 180 d(from May to October), the amounts of N and P removed by E. crassipes were 0.76 g·m-2·d-1 and 0.09 g·m-2·d-1, respectively; the amounts of N and P removed by M. elatinoides were 1.17 g·m-2·d-1 and 0.08 g·m-2·d-1, respectively. In addition to the assimilation by marcophytes, degradation by root microorganisms also played an important role in the purification of contaminants. These results indicate that ecological floating beds with E. crassipes and M. elatinoides can effectively decrease the concentrations of N and P, degrade organic contaminants and retain particulate matter, which have positive impacts on the alleviation of eutrophication in downstream waters. |
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