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| Removal efficiency of pollutants in the rural catchment branch by the combined engineering of ecological restoration |
| Received:August 09, 2022 |
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| KeyWord:combined engineering of ecological restoration;rural catchment branch;rainfall runoff from the vegetable field;nitrogen;phosphorus |
| Author Name | Affiliation | E-mail | | ZHANG Yingying | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | | | WEN Xuezheng | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | LI Min | School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | | | XU Jiabing | Qianhuang Water Station, Wujin District, Changzhou City, Changzhou 213172, China | | | SONG Xuefei | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | JIANG Zhihui | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | LIU Haiqin | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | WANG Yan | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | ZHANG Zhiyong | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | jaaszyzhang@126.com |
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| Abstract: |
| To reduce the pollutants in a catchment branch in a rural residential area, a combined engineering project of ecological restoration consisting of a pre-reservoir, wetland pond, and ecological ditch was constructed in the secondary branch on the northeast of Xinyunxiaoqiaobang Branch in Yuncun Village, Qianhuang Town, Changzhou City. Water samples were collected 7 times in the regular and dry seasons and 7 times in the flood season. The physical and chemical indexes of water samples, including water temperature, pH, dissolved oxygen（DO）, total nitrogen（TN）, ammonia nitrogen（NH+4-N）, nitrate nitrogen（NO-3-N）, total phosphorous（TP）, phosphate（PO3-4-P）, chemical oxygen demand（COD）, and suspended solids（SS）, were monitored to analyze the total removal rates of pollutants, assess pollutant flux of the three process sections, and estimate the pollution load reduction by the engineering. The results showed that in the regular and dry seasons, physical settlement and permeable dam interception primarily removed the particulate pollutants in water, while in the flood season, plant absorption and microbial degradation removed the dissolved pollutants from the water. The pollution loads of TN and TP were mainly due to rural domestic sewage and scattered vegetable fields. In contrast, the pollution loads of COD mainly came from rural domestic sewage. In the secondary branch water, the proportion of NO-3-N was higher than NH+4-N in nitrogen, and the proportion of particulate phosphorus（PP）was higher than PO3-4-P in phosphorus. The combined engineering annually reduced the TN, TP, and COD from land-based sources by approximately 166.23, 20.07 kg·a-1 and 502.66 kg·a-1, respectively. Even though the combined engineering of ecological restoration reduced the pollutant load partially, the interception of terrigenous pollutants from production and life and in-situ water purification in the Xinyunxiaoqiaobang Branch should be enhanced. |
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