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| 沿江地区污染场地包气带“三氮”迁移转化过程研究 |
| Research on Migration and Transformation of “Three Forms of Nitrogen” in Aeration Zone of A Contaminated Site Along the Yangtze River |
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| DOI： |
| 中文关键词: “三氮” 包气带 迁移转化 数值模拟 沿江污染场地 |
| 英文关键词: “Three forms of nitrogen” Aeration zone Migration and transformation Numerical simulation Contaminated sites along the river |
| 基金项目:国家重点研发计划基金资助项目（2022YFC3702500）；地下水污染控制与修复教育部工程研究中心开放基金资助项目（GW202413）；江苏省环保科研课题基金资助项目（2019001）；江苏省土壤与地下水污染防控工程研究中心自主课题基金资助项目（ZY24008） |
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| 摘要点击次数: 29 |
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| 中文摘要: |
| 构建了包气带土壤水分运动和溶质运移耦合模型，模拟特定降雨条件下“三氮”在沿江地区污染场地包气带垂向的迁移转化过程。结果表明：“三氮”在包气带0 m～2 m范围内以吸附和硝化作用为主，在2 m～8 m范围内以反硝化作用为主，越接近包气带底部反硝化作用越强烈；包气带确对饱水带能起到一定的防护作用，考虑吸附、生物降解作用，模拟应力期内NH+4并未迁移至地下潜水面，NO-2可忽略不计，NO-3最终以36 mg/L迁移至地下水并发生环境污染行为。 |
| 英文摘要: |
| A coupling model of water movement and solute transport in the soil aeration zone was established to simulate the vertical migration and transformation of “three forms of nitrogen” in aeration zone of a contaminated site along the Yangtze River under specific rainfall conditions. The results showed that in the range of 0 m to 2 m in aeration zone， “three forms of nitrogen” underwent adsorption and nitrification， while in the range of 2 m to 8 m， denitrification was dominant， and the closer it was to the bottom of the aeration zone， the stronger the denitrification. The aeration zone could provide a certain protective effect on the saturated water. Considering adsorption and biodegradation， NH4+ did not migrate to the underground diving surface during the simulated 〖JP2〗stress period， the concentration of NO-2 could be ignored， and NO-3 eventually migrated to groundwater at a concentration of 36 mg/L and caused environmental pollution. |
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