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Investigation on groundwater NH4+-N purification by passive overflow-PRB at valley-type landfill sites
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Li ZHAO1, 2, Liang-tong ZHAN2, *, Yu-qing YOU3, Qian PAN1, Cheng CHEN4
China Environmental Science | 2025, 45(11) : 6230 - 6240
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China Environmental Science | 2025, 45(11): 6230-6240
• Environmental Ecology •
Investigation on groundwater NH4+-N purification by passive overflow-PRB at valley-type landfill sites
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Li ZHAO1, 2, Liang-tong ZHAN2, *, Yu-qing YOU3, Qian PAN1, Cheng CHEN4
Affiliations
  • 1.College of Civil Engineering and Architecture, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
  • 2.Key Laboratory of Soft Soils and Geo-environmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China
  • 3.Research Center for Geothermal Resource Exploration, Development, and Comprehensive Utilization, Tianfu Yongxing Laboratory, Chengdu 610213, China
  • 4.School of Engineering, Hangzhou City University, Hangzhou 310015, China
Published: 2025-11-20
Outline
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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.

municipal solid waste landfill  /  valley-type  /  contaminated groundwater  /  permeable reactive barrier  /  ammonium nitrogen  /  overflow
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. 中国环境科学, 2025 , 45 (11) : 6230 -6240 .
Li ZHAO, Liang-tong ZHAN, Yu-qing YOU, Qian PAN, Cheng CHEN. Investigation on groundwater NH4+-N purification by passive overflow-PRB at valley-type landfill sites[J]. China Environmental Science, 2025 , 45 (11) : 6230 -6240 .
Appendix
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Year 2025 volume 45 Issue 11
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Article Info
  • Receive Date：2025-03-20
  • Online Date：2026-10-08
  • Published：2025-11-20
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History
  • Received：2025-03-20
Funding
Affiliations
    1.College of Civil Engineering and Architecture, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
    2.Key Laboratory of Soft Soils and Geo-environmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China
    3.Research Center for Geothermal Resource Exploration, Development, and Comprehensive Utilization, Tianfu Yongxing Laboratory, Chengdu 610213, China
    4.School of Engineering, Hangzhou City University, Hangzhou 310015, China
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表12种不同金属材料的力学参数
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Family		 属数
Number of
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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