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Journals
Processes
Special Issues
Advances in Solid Waste Treatment Technology and Contamination Remediation
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Advances in Solid Waste Treatment Technology and Contamination Remediation

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: 20 April 2025 | Viewed by 2678

Special Issue Editors

Dr. Jie Hu

E-Mail Website
Guest Editor
Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
Interests: waste landfill; multi-phase flow; slope stability; extraction and injection technology
Dr. Hui Xu

E-Mail Website
Guest Editor
School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China
Interests: municipal solid waste; construction solid waste; excavated soil; slope stability
Special Issues, Collections and Topics in MDPI journals
Dr. Xiaobing Xu

E-Mail Website
Guest Editor
School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
Interests: waste landfill; multi-phase flow; vertical barrier; capillary barrier
Dr. Wenjie Zhang

E-Mail Website
Guest Editor
College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China
Interests: landfill; leachate; contaminated soil; remediation

Special Issue Information

Dear Colleagues,

Solid waste management is a universal issue affecting every single person in the world. Individuals and governments make decisions about consumption and waste management that affect communities’ daily health, productivity, and cleanliness. Globally, approximately 37 percent of waste is disposed of in some type of landfill, 33 percent is openly dumped, 19 percent undergoes materials recovery through recycling and composting, and 11 percent is treated through modern incineration. Advanced solid waste treatment technology requires no discharge of pollution to land, water, and air that threatens the environment or human health. At the same time, the remediation of groundwater and soil pollution generated by solid waste is also receiving increasing attention from society.

This Special Issue on “Advances in Solid Waste Treatment Technology and Contamination Remediation” seeks high-quality works focusing on laboratory testing, field testing, and numerical modeling of solid waste. Topics include, but are not limited to:

  • Processing and utilization of municipal solid waste, construction waste, and industrial waste.
  • Geoenvironmental issues and disaster prevention of solid waste landfill.
  • Remediation of groundwater and soil in contaminated sites.
  • Life cycle assessment (LCA) and techno-economical analysis (TEA) of solid waste management.

Dr. Jie Hu
Dr. Hui Xu
Dr. Xiaobing Xu
Dr. Wenjie Zhang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • municipal solid waste
  • construction waste
  • industrial waste landfill
  • geoenvironment
  • contamination sites
  • in situ remediation
  • life cycle assessment
  • techno-economical analysis

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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Research

16 pages, 2647 KiB  
Article
Analytical Solution for Contaminant Transport through a Soil–Bentonite (SB)/Geosynthetic Clay Liner (GCL)/Soil–Bentonite (SB) Composite Cutoff Wall and an Aquifer
by Ming-Qing Peng, Zhi-Chao Qiu, Zhang-Long Chen, Hui Xu, Si-Liang Shen and Jia-Jie Zhou
Processes 2024, 12(7), 1486; https://doi.org/10.3390/pr12071486 - 16 Jul 2024
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Abstract
This study develops a one-dimensional analytical solution for contaminant advection, diffusion and adsorption through a soil–bentonite (SB)/geosynthetic clay liner (GCL)/SB–aquifer composite cutoff wall (CCW) system. The solution agrees well with an existing double-layer model. Adopting toluene as a representative contaminant, using the present [...] Read more.
This study develops a one-dimensional analytical solution for contaminant advection, diffusion and adsorption through a soil–bentonite (SB)/geosynthetic clay liner (GCL)/SB–aquifer composite cutoff wall (CCW) system. The solution agrees well with an existing double-layer model. Adopting toluene as a representative contaminant, using the present solution, the analysis systematically investigates the impact of hydraulic gradient (i) and the hydraulic conductivities of GCL (kgcl) and SB (ksb). The results show the following: (1) Increasing i from 0.1 to 1 reduces the concentration breakthrough time (tcb) from 20 to 11 years and mass flux breakthrough time (tfb) from infinite to 11 years, indicating lower i significantly extend both tcb and tfb, which is crucial for optimizing CCW barrier performance; (2) lowering kgcl from 5.0 × 10−11 m/s to 1 × 10−12 m/s and reducing ksb from 1.0 × 10−9 m/s to 1.0 × 10−11 m/s, would increase the tcb by 36% and 100%, respectively. It demonstrates that reducing kgcl and ksb could enhance barrier performance. (3) To achieve equivalent barrier performance, soil–bentonite cutoff wall (SBCW) requires greater thickness compared to SB/GCL/SB CCW, indicating that GCL reduces the required amount of bentonite; and (4) CCWs can use SB with lower adsorption capacity to achieve equivalent performance, further reducing bentonite requirements. The present solution can aid in the design and optimization of GCL-enhanced CCWs. Full article
(This article belongs to the Special Issue Advances in Solid Waste Treatment Technology and Contamination Remediation)
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14 pages, 5580 KiB  
Article
Numerical Investigation of Confining Pressure Effects on Microscopic Structure and Hydraulic Conductivity of Geosynthetic Clay Liners
by Juan Hou, Yinyu Sun, Chenxi Chu and Rui Sun
Processes 2024, 12(5), 980; https://doi.org/10.3390/pr12050980 - 12 May 2024
Viewed by 1025
Abstract
A series of COMSOL numerical models were developed to explore how confining pressure impacts the microscopic structure and hydraulic conductivity of Geosynthetic Clay Liners (GCLs), taking into account the bentonite swelling ratio, mobile porosity, pore size, and tortuosity of the main flow path. [...] Read more.
A series of COMSOL numerical models were developed to explore how confining pressure impacts the microscopic structure and hydraulic conductivity of Geosynthetic Clay Liners (GCLs), taking into account the bentonite swelling ratio, mobile porosity, pore size, and tortuosity of the main flow path. The study reveals that the mobile porosity and pore size are critical factors affecting GCL hydraulic conductivity. As confining pressure increases, the transition of mobile water to immobile water occurs, resulting in a reduction in mobile water volume, the narrowing of pore channels, decreased flow velocity, and diminished hydraulic conductivity within the GCL. Mobile porosity undergoes a slight decrease from 0.273 to 0.104, while the ratio of mobile porosity to total porosity in the swelling process decreases significantly from 0.672 to 0.256 across the confining pressure range from 50 kPa to 500 kPa, which indicates a transition of mobile water toward immobile water. The tortuosity of the main flow path shows a slight increase, fluctuating within the range of 1.30 to 1.36, and maintains a value of around 1.34 as the confining pressure rises from 50 kPa to 500 kPa. At 50 kPa confining pressure, the minimum pore width measures 5.2 × 10−5 mm, with a corresponding hydraulic conductivity of 6.2 × 10−11 m/s. With an increase in confining pressure to 300 kPa, this compression leads to a narrower minimum pore width of 1.81 × 10−5 mm and a decrease in hydraulic conductivity to 5.11 × 10−12 m/s. The six-fold increase in confining pressure reduces hydraulic conductivity by one order of magnitude. A theoretical equation was derived to compute the hydraulic conductivity of GCLs under diverse confining pressure conditions, indicating a linear correlation between the logarithm of hydraulic conductivity and confining pressure, and exhibiting favorable agreement with experimental findings. Full article
(This article belongs to the Special Issue Advances in Solid Waste Treatment Technology and Contamination Remediation)
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