Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic performance

doi:10.1007/s11783-022-1591-y

Front. Environ. Sci. Eng.

2022, Vol. 16

Issue (12) : 156 https://doi.org/10.1007/s11783-022-1591-y

RESEARCH ARTICLE

Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic performance

Kaixuan Zheng¹, Xingshen Luo¹, Yiqi Tan¹, Zhonglei Li¹, Hongtao Wang¹(

), Tan Chen²(

), Li Zhao³, Liangtong Zhan³

¹. School of Environment, Tsinghua University, Beijing 100084, China
². College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
³. Institute of Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

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Abstract

● A novel PRB configuration based on passive convergent flow effect was proposed.

● A 2D finite-difference hydrodynamic model, PRB-Flow, was developed.

● PC-PRB can significantly enhance the hydraulic capture capacity of PRB.

● The PRB geometric dimensions and materials cost are effectively reduced.

● The dominant influential factor of the PC-PRB capture width is pipe length, L_p.

A novel permeable reactive barrier (PRB) configuration, the so-called passive convergence-permeable reactive barrier (PC-PRB), is proposed to overcome several shortcomings of traditional PRB configurations, such as high dependency to site hydrogeological characteristics and plume size. The PC-PRB is designed to make the plume converge towards the PRB due to the passive hydraulic decompression-convergent flow effect. The corresponding passive groundwater convergence (PC) system is deployed upstream of the PRB system, which consists of passive wells, water pipes, and a buffer layer. A two-dimensional (2D) finite-difference hydrodynamic code, entitled PRB-Flow, is developed to examine the hydraulic performance parameters (i.e., capture width (W) and residence time (t)) of PC-PRB. It is proved that the horizontal 2D capture width (W_h) and vertical 2D capture depth (W_v) of the PC-PRB remarkably increase compared to that of the continuous reactive barrier (C-PRB). The aforementioned relative growth values in order are greater than 50% and 25% in this case study. Therefore, the PRB geometric dimensions as well as the materials cost required for the same plume treatment lessens. The sensitivity analysis reveals that the dominant factors influencing the hydraulic performance of the PC-PRB are the water pipe length (L_p), PRB length (L_PRB), passive well height (H_w), and PRB height (H_PRB). The discrepancy between the W_h of PC-PRB and that of the C-PRB (i.e., ΔW_h) has a low correlation with PRB parameters and mainly depends on L_p, which could dramatically simplify the PC-PRB design procedure. Generally, the proposed PC-PRB exhibits an effective PRB configuration to enhance hydraulic performance.

Keywords Passive convergence-permeable reactive barrier (PC-PRB) Permeable reactive barrier configuration Numerical simulation Hydraulic performance evaluation Sensitivity analysis

Corresponding Author(s): Hongtao Wang,Tan Chen

Issue Date: 28 June 2022

Cite this article:

Kaixuan Zheng,Xingshen Luo,Yiqi Tan, et al. Passive convergence-permeable reactive barrier (PC-PRB): An effective configuration to enhance hydraulic performance[J]. Front. Environ. Sci. Eng., 2022, 16(12): 156.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-022-1591-y
https://academic.hep.com.cn/fese/EN/Y2022/V16/I12/156

Fig.1 A schematic view of the plume treatment by the PC-PRB system.

Fig.2 The PC-PRB-based simulation and main design parameters representation: (a) The horizontal 2D confined aquifer, (b) the vertical 2D confined aquifer.

Tab.1 Geometrical parameters and their corresponding values for the PC-PRB

Tab.2 Comparison between the hydraulic performance factors of the PC-PRB and those of the PRB

Fig.3 Hydraulic capture width (W) comparison between PC-PRB and C-PRB: (a) The horizontal 2D capture width (W_{h, C-PRB}) of the C-PRB, (b) the horizontal 2D capture width (W_{h, PC-PRB}) of the PC-PRB, (c) the vertical 2D capture depth (W_{v, C-PRB}) of the C-PRB, (d) the vertical 2D capture depth (W_{v, PC-PRB}) of the PC-PRB.

Fig.4 The sensitivity index (SI) analysis of various factors: (a) W_h, (b) t_h, (c) W_v, (d) t_v.

Fig.5 Effects of L_p and H_w on crucial factors for various levels of L_PRB and H_PRB: (a) ΔW_h, (b) Δt_h, (c) ΔW_v, (d) Δt_v.

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