Soil flushing for remediation of landfill leachate-contaminated soil : A comprehensive evaluation of optimal flushing agents and influencing factors
Copyright © 2025 Elsevier Ltd. All rights reserved.
| Publié dans: | Waste management (New York, N.Y.). - 1999. - 200(2025) vom: 01. Mai, Seite 114771 |
|---|---|
| Auteur principal: | |
| Autres auteurs: | , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2025
|
| Accès à la collection: | Waste management (New York, N.Y.) |
| Sujets: | Journal Article Contaminated soil Flushing agents Landfill leachate Saponin Soil flushing Soil Pollutants Surface-Active Agents Water Pollutants, Chemical Soil plus... |
| Résumé: | Copyright © 2025 Elsevier Ltd. All rights reserved. Screening the appropriate agent is essential to enhancing the effectiveness of soil flushing techniques in remediating landfill leachate contaminated soil. To identify effective flushing agents for leachate-contaminated soil and determine optimal conditions for their use, this study evaluated five surfactants and three chelating agents. These agents were analyzed through batch experiments and one-dimensional column tests to assess the effects of pH, temperature, solid-liquid ratio, and injection conditions on their efficacy. The findings revealed that saponin, known for its high degradability, was most effective in extracting heavy metals (total Cr and Cr (VI)), total nitrogen, ammonia nitrogen, and organic compounds. Notably, the removal efficiency of these contaminants by saponin increased with higher concentrations. Conversely, higher pH levels reduced the effectiveness of polysorbate 80 (Tween 80), rhamnolipid (RL), and saponin in removing chromium but improved ammonia nitrogen extraction. Alternatively, the remediation outcomes are also subject to a tight control of temperature and solid-liquid ratios, which is reflected in the strengthening efficiency along with rising temperatures and the amount of flushing agents applied. The study further examined the impact of different injection methods on the remediation process. Continuous injection was most effective for soils primarily contaminated with chromium, whereas a step-gradient mode yielded better results for nitrogen compounds. For soils with a high concentration of organic pollutants, a multi-pulse injection mode was optimal. These insights provide a solid foundation for developing targeted soil flushing strategies aimed at enhancing the remediation of soils contaminated by landfill leachate |
|---|---|
| Description: | Date Completed 16.04.2025 Date Revised 16.04.2025 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1879-2456 |
| DOI: | 10.1016/j.wasman.2025.114771 |