| 张迎颖,李敏,潘吴意,王岩,姜智绘,苏国东,刘海琴,张志勇.生态沟渠对农田退水污染物的净化效能及其配置规模[J].农业环境科学学报,2025,44(1):105-116. |
| 生态沟渠对农田退水污染物的净化效能及其配置规模 |
| Purification efficiency of pollutants in farmland runoff by the ecological ditch and its configuration scale |
| 投稿时间：2024-06-13 |
| DOI：10.11654/jaes.2024-0499 |
| 中文关键词: 生态沟渠 农田退水 氮 磷 配置规模 |
| 英文关键词: ecological ditch farmland runoff nitrogen phosphorus configuration scale |
| 基金项目:国家重点研发计划项目（2021YFD1700805-02）；江苏省重点研发计划项目（D21YFD17008）；江苏省农业科技自主创新资金项目（CX（19）1007）；国家重大科技专项水体污染控制与治理专项（2017ZX07202004-07） |
| 作者 | 单位 | E-mail | | 张迎颖 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014
江苏大学环境与安全工程学院, 江苏 镇江 212013 | | | 李敏 | 江苏大学环境与安全工程学院, 江苏 镇江 212013 | | | 潘吴意 | 江苏大学环境与安全工程学院, 江苏 镇江 212013 | | | 王岩 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | | | 姜智绘 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | | | 苏国东 | 江苏省农业科学院休闲农业研究所, 南京 210014 | | | 刘海琴 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | | | 张志勇 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014
江苏大学环境与安全工程学院, 江苏 镇江 212013 | jaaszyzhang@126.com |
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| 中文摘要: |
| 生态沟渠是我国南方水网区农业面源污染防控技术体系的重要环节，其与农田面积相对应的配置规模研究尚无定论。选择3条规格相同的试验沟渠进行生态化改造，增设湿生植物、生物填料箱和生态滤坝，构建生态沟渠。设置不同强化净化措施的沟渠处理，分别为：湿生植物+1座生物填料箱+1座生态滤坝处理（D1）、湿生植物+2座生物填料箱+2座生态滤坝处理（D2）、湿生植物+3座生物填料箱+3座生态滤坝处理（D3），并控制进水流量的变化，对比不同处理生态沟渠对农田退水污染物的净化效能，分析污染通量在时空尺度上的变化情况，探讨对应于单位农田面积的生态沟渠配置规模。结果表明：强化处理生态沟渠对TN、NH+4-N、TP和 COD 的削减率分别为 33.9%~49.1%、37.8%~42.9%、29.3%~42.0% 和 60.0%~78.1%，其中，D2和 D3对 TN和 TP的削减率较高。D2和D3出水TN和COD的污染通量显著低于D1（P<0.05），而3条沟渠出水NH+4-N和TP的污染通量之间无显著差异。流水试验条件下，出水 TN和 TP降低至 2.0 mg·L-1和 0.2 mg·L-1，D3所需要的沟渠长度分别为 85.4 m和 57.3 m，为 3条强化措施处理沟渠中最短；对应于667 m2农田，单日降雨量为60 mm，TN浓度降低4.64 mg·L-1，按照D3沟渠的设施配置，1 m3的生态沟渠可处理19 m2的农田退水。在后续研究中，可因地制宜应用湿生植物+3座生物填料箱+3座生态滤坝（D3）的强化净化措施，并有效衔接生态沟渠与汇水塘浜，考量两者的综合净化效能，对“田-沟-塘-浜”的配置规模进行总体测算。 |
| 英文摘要: |
| Ecological ditch is an important part of control technology system of agricultural non-point source pollution in south China water network area. The appropriate scale of ecological ditch corresponding to farmland area has not been determined yet. 3 ditches of the same specification have been reconstructed to ecological ditches by setting up wet plants, biofilm carrier boxes and ecological filter dams. The 3 ecological ditch treatments with different enhanced purification measures were set up, including the treatment of wet plants, one biofilm carrier box with one ecological filter dams（D1）; the treatment of wet plants, two biofilm carrier boxes with two ecological filter dams（D2）；the treatment of wet plants, three biofilm carrier boxes with three ecological filter dams（D3）. Meanwhile, the influent flows of the ditches were controlled. Purification efficiencies of different treatment ecological ditches on pollutants from farmland runoff were compared, the variations of pollution flux on the time and space scale were analyzed, and the appropriate scale of ecological ditch corresponding to unit farmland area were discussed. The results showed the removal efficiencies of TN, NH4+-N, TP and COD in the ecological ditches were respectively 33.9%-49.1%, 37.8%-42.9%, 29.3%-42.0% and 60.0%-78.1%, meanwhile the removal efficiencies of TN and TP in D2 and D3 were higher. The pollutant fluxes of TN and COD in the effluent of D2 and D3 were significantly lower than D1, while there was no significant difference among the pollutant fluxes of NH4+-N and TP in the effluent of the 3 ecological ditches. The average TN and TP concentrations was reduced down to 2 mg ·L-1 and 0.2 mg ·L-1 at the point of 85.4 m and 57.3 m along the ditch of D3, respectively. Moreover, the required length of D3 was the shortest one among the 3 ecological ditches. Under the flow experiment conditions with daily rainfall of 60 mm·d-1 and TN concentration reduction of 4.64 mg·L-1, 1 m3 ecological ditch with the configuration facilities of D3 can treat the drainage from 19 m2 farmland. In follow-up studies, the enhanced purification measures of wet plants, three biofilm carrier boxes with three ecological filter dams（D3）should be applied according to local conditions, and the ecological ditches and catchment ponds and branches should be effectively combined, comprehensive purification efficiency of ecological ditches and catchment ponds and branches should be considered to estimate the configuration scale of“farmlands-ditches-ponds-rivers”as a whole. |
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