A passive sink-zeolite permeable reactive barrier to control NH 4 + -N pollution plume within groundwater: Conceptual design and numerical modeling.

Autor: Zhan L; Department of Civil Engineering, Zhejiang University, Hangzhou, 310058, China; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China., Zhao L; Department of Civil Engineering, Zhejiang University, Hangzhou, 310058, China; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China., Wu L; 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. Electronic address: wulinbo2020@zju.edu.cn., You Y; Department of Civil Engineering, Zhejiang University, Hangzhou, 310058, China; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China., Bate B; Department of Civil Engineering, Zhejiang University, Hangzhou, 310058, China; MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, 310058, China.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2023 Sep; Vol. 334, pp. 138965. Date of Electronic Publication: 2023 May 24.
DOI: 10.1016/j.chemosphere.2023.138965
Abstrakt: Ammonium nitrogen (NH 4 + -N) is a typical inorganic pollutant in the groundwater at landfill sites, and high-concentration NH 4 + -N is toxic to humans and organisms. Zeolite can effectively remove NH 4 + -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 4 + -N using the PS-zPRB, numerical modeling on decontamination of NH 4 + -N plumes at a landfill site was performed. The results indicated that the NH 4 + -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.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023. Published by Elsevier Ltd.)
Databáze: MEDLINE
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