Application of Separation Technology in Comprehensive Utilization of Solid Waste

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Environmental Separations".

Deadline for manuscript submissions: closed (10 June 2025) | Viewed by 267

Special Issue Editors


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Guest Editor
School of Ecology and Environment, Zhengzhou University, Zhengzhou, China
Interests: comprehensive utilization of solid waste; efficient processing and utilization of phosphorus resources; slow release fertilizer; industrial crystallization

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Guest Editor
Institute of Process Engineering (IPE) of Chinese Academy of Sciences (CAS), Beijing, China
Interests: solid waste resource utilization

Special Issue Information

Dear Colleagues,

The double pressure of solid waste pollution and shortage of natural resources threatens the survival and life of human beings. The comprehensive utilization of solid waste is an effective and the best way to save resources and prevent pollution. Separation technology is an important technical means for the comprehensive utilization of solid waste. The separation technology can improve the resource recovery and utilization rate of solid waste, reduce environmental pollution, promote the resource utilization of solid waste, and reduce the pressure of landfill.

Therefore, the purpose of this publication is to introduce the application of separation technology in the comprehensive utilization of solid waste. We are pleased to invite you to contribute your research article, communication, or review in this Special Issue dedicated to the separation and recycling of resources in solid waste.

Dr. Pengfei Liu
Dr. Wenfen Wu
Guest Editors

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Keywords

  • solid waste
  • separation
  • recovery
  • environmental pollution
  • reduction
  • harmless
  • resource utilization

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Published Papers (1 paper)

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Research

15 pages, 2406 KiB  
Article
Adsorption Performance and Mechanism of Gallium from Sulfuric Acid Leach Liquor of High-Alumina Fly Ash
by Wenfen Wu, Chaolu Wen, Shaopeng Li, Zhenhua Sun, Xinjuan Hou, Huiquan Li and Zhibin Ma
Separations 2025, 12(8), 190; https://doi.org/10.3390/separations12080190 - 23 Jul 2025
Abstract
High-alumina fly ash may potentially be a valuable source of Ga with a concentration of Ga at 80 mg/kg. Direct adsorption and enrichment of Ga from sulfuric acid leach liquor of high-alumina fly ash is developed in this study. The H-type chelating resin [...] Read more.
High-alumina fly ash may potentially be a valuable source of Ga with a concentration of Ga at 80 mg/kg. Direct adsorption and enrichment of Ga from sulfuric acid leach liquor of high-alumina fly ash is developed in this study. The H-type chelating resin with two carboxy groups exhibited the best adsorption capacity for Ga. The maximum adsorption capacity for Ga was 55 mg/g resin with an adsorption time of 24 h, an initial Ga concentration of 500 mg/L, an adsorption temperature of 55 °C, and an initial acid concentration of 0.1 mol/L. The adsorption process of Ga was in good fit with the Langmuir isotherm and pseudo-second-order reaction kinetics model. The chemical adsorption rate was controlled by an internal diffusion mechanism. The resin had a high selectivity for Ga3+ with a Kd over 3600 compared with Fe2+, Al3+, K+, Ca2+, and Mg2+. The adsorption mechanism was found to be the ion exchange reaction between Ga and H of carboxy and hydroxyl groups. The concentration of Ga in sulfuric acid leach liquor from high-alumina fly ash achieved enrichment from 200 mg/L to 2 g/L. It is an attractive medium for large-scale Ga extraction from high-alumina fly ash. Full article
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