地下水内 NH-N 污染羽流的被动沸石渗透反应屏障控制：概念设计与数值模拟。
A passive sink-zeolite permeable reactive barrier to control NH-N pollution plume within groundwater: Conceptual design and numerical modeling.
机构信息
Department of Civil Engineering, Zhejiang University, Hangzhou, 310058, China; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China.
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China; Center for Hypergravity Experiment and Interdisciplinary Research, Zhejiang University, Hangzhou, 310058, China.
出版信息
Chemosphere. 2023 Sep;334:138965. doi: 10.1016/j.chemosphere.2023.138965. Epub 2023 May 24.
Ammonium nitrogen (NH-N) is a typical inorganic pollutant in the groundwater at landfill sites, and high-concentration NH-N is toxic to humans and organisms. Zeolite can effectively remove NH-N in water by adsorption, and it is suitable to be used as a type of reactive materials for permeable reactive barriers (PRBs). A passive sink-zeolite PRB (PS-zPRB) with higher capture efficiency than a continuous permeable reactive barrier (C-PRB) was proposed. And a passive sink configuration was integrated with PRB in the PS-zPRB, this configuration enabled the high hydraulic gradient of groundwater at the treated sites to be fully utilized. In order to explore treatment efficiency for groundwater NH-N using the PS-zPRB, numerical modeling on decontamination of NH-N plumes at a landfill site was performed. The results indicated that the NH-N concentrations of PRB effluent gradually decreased from 21.0 mg/L to 0.5 mg/L within 5 y, and met the drinking water standards after treatment for 900 d. The decontamination efficiency index of PS-zPRB was consistently higher than 95% within 5 y, and the service life of PS-zPRB appeared over 5 y. The capture width of PS-zPRB effectively exceeded the PRB length by around 47%. Compared with C-PRB, the capture efficiency of PS-zPRB was increased by around 28%, and the reactive material of PS-zPRB was saved by approximately 23% in volume.
氨氮（NH-N）是垃圾填埋场地下水中的一种典型无机污染物，高浓度的 NH-N 对人类和生物具有毒性。沸石可以通过吸附有效地去除水中的 NH-N，是一种适合作为可渗透反应屏障（PRB）的反应性材料。提出了一种具有比连续可渗透反应屏障（C-PRB）更高捕获效率的被动汇-沸石 PRB（PS-zPRB）。在 PS-zPRB 中，将被动汇与 PRB 集成在一起，这种配置可以充分利用处理地点的高地下水流速。为了探索 PS-zPRB 对地下水 NH-N 的处理效率，对垃圾填埋场中 NH-N 羽流的污染控制进行了数值模拟。结果表明，PRB 出水中的 NH-N 浓度在 5 年内逐渐从 21.0mg/L 降至 0.5mg/L，经过 900d 的处理后达到饮用水标准。在 5 年内，PS-zPRB 的去污效率指数始终高于 95%，其使用寿命超过 5 年。PS-zPRB 的捕获宽度有效超过 PRB 长度约 47%。与 C-PRB 相比，PS-zPRB 的捕获效率提高了约 28%，体积减少了约 23%。
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