山谷型填埋场溢流式PRB净化地下水氨氮研究

赵莉; 詹良通; 游雨晴; 潘倩; 陈成

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (11) : 6230-6240.

环境生态

山谷型填埋场溢流式PRB净化地下水氨氮研究

赵莉^1,2, 詹良通², 游雨晴³, 潘倩¹, 陈成⁴

作者信息 +

Investigation on groundwater NH₄⁺-N purification by passive overflow-PRB at valley-type landfill sites

ZHAO Li^1,2, ZHAN Liang-tong², YOU Yu-qing³, PAN Qian¹, CHEN Cheng⁴

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文章历史 +

摘要

山谷型生活垃圾填埋场通常具有水力梯度大、地下水流速高和污染迁移快等特点,传统结构的可渗透反应墙(PRB)难以高效捕获地下水污染羽.针对山谷型填埋场地下水污染迁移特征,提出了溢流式PRB新型结构.溢流式PRB由低渗透性阻隔墙和高渗透性PRB组成,PRB位于阻隔墙中间区段的上部.阻隔墙可汇聚上游地下水并雍高水位,迫使污染地下水通过PRB区段进行净化.溢流式PRB适于修建在山谷的下游出流口处,可防止污染羽进一步向场区外运移,并解决所需PRB建造深度过大的问题.为验证溢流式PRB的有效性,以广东省和浙江省两处山谷型填埋场下游地下水氨氮为净化对象,采用NaCl改性沸石作为PRB填料,应用MODFLOW和MT3DMS模型预测布设溢流式PRB后的集流和净化效果.模拟结果显示:在山谷型填埋场下游布设溢流式PRB可有效阻滞污染羽进一步向下游迁移,5年内两处溢流式沸石PRB下游氨氮浓度低于20.0mg/L或1.5mg/L.

Abstract

Valley-type municipal solid waste (MSW) landfill sites were characterized by a large hydraulic gradient, high groundwater flow velocity and rapid contamination migration. It was challenging for traditional permeable reactive barriers (PRBs) to efficiently capture contamination plumes under these conditions. According to the contamination migration characteristics of valley-type landfill sites, a novel passive overflow-PRB was proposed in this paper. The passive overflow-PRB was composed of a low-permeability cutoff wall and a high-permeability PRB, with the PRB situated in the upper-middle section of the cutoff wall. Upstream groundwater would be captured by the cutoff wall, then the groundwater level would be elevated and the contaminated groundwater would be forced through the PRB for remediation. This design was suitable for installation at the downstream outflow of a valley, effectively preventing further migration of the contamination plume off-site, and solving the problem of excessive construction depth required for the PRB. To validate the effectiveness of the passive overflow-PRB, the groundwater ammonium nitrogen (NH₄⁺-N) from two valley-type landfill sites in Guangdong Province and Zhejiang Province was taken as the remediation target. NaCl-modified zeolite was applied as the reactive material of the PRB, and MODFLOW and MT3DMS models were employed to simulate the collection and remediation effects after construction of passive overflow-PRB. The simulation results indicated that the passive overflow-zeolite PRB could effectively prevent the further migration of NH₄⁺-N contamination plume to the downstream, maintaining concentrations below 20.0mg/L or 1.5mg/L for 5years.

导出引用

赵莉, 詹良通, 游雨晴, 潘倩, 陈成. 山谷型填埋场溢流式PRB净化地下水氨氮研究[J]. 中国环境科学. 2025, 45(11): 6230-6240

ZHAO Li, ZHAN Liang-tong, YOU Yu-qing, PAN Qian, CHEN Cheng. Investigation on groundwater NH₄⁺-N purification by passive overflow-PRB at valley-type landfill sites[J]. China Environmental Science. 2025, 45(11): 6230-6240

中图分类号： X523

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