化学增强电动土工合成（EKG）电渗透结合真空预压在污染疏浚污泥中的固结和铜修复

IF 6.2 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2025-08-25 DOI:10.1016/j.geotexmem.2025.08.008

Yang Shen , Nihao Wei , Kewei Fan , Wencheng Qi , Jianting Feng , Zhiqiang Lai

{"title":"化学增强电动土工合成（EKG）电渗透结合真空预压在污染疏浚污泥中的固结和铜修复","authors":"Yang Shen , Nihao Wei , Kewei Fan , Wencheng Qi , Jianting Feng , Zhiqiang Lai","doi":"10.1016/j.geotexmem.2025.08.008","DOIUrl":null,"url":null,"abstract":"<div><div>Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading was employed to simultaneously consolidate and remediate copper-contaminated dredged sludge. Five chemical additives—citric acid, tartaric acid, hydrogen peroxide, rhamnolipids, and sodium chloride—were systematically evaluated via model tests. Results show that all additives improve both drainage and copper removal, with sodium chloride exhibited the enhancement in dewatering performance, while rhamnolipid achieved the highest copper removal efficiencies. Mechanistic analysis revealed that chemical additives improved sludge dewatering by enhancing pore water migration—through modifying soil structure, increasing ionic conductivity, or reducing surface tension. They also promoted copper removal by altering speciation: acidic chelating agents reduced pH and stabilized Cu<sup>2+</sup> in soluble complexes, suppressing precipitation, while in near-neutral conditions, cathodic OH<sup>−</sup> dissolved Cu(OH)<sub>2</sub> into mobile species, facilitating transport. Energy analysis confirmed that chemical-enhanced systems improved the energy efficiency of copper removal. These findings support the integrated use of EKG electro-osmosis combined with vacuum preloading, coupled with appropriate chemical agents, as a viable and energy-efficient strategy for the remediation of heavy metal-contaminated dredged sludge.</div></div>","PeriodicalId":55096,"journal":{"name":"Geotextiles and Geomembranes","volume":"53 6","pages":"Pages 1600-1609"},"PeriodicalIF":6.2000,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading for consolidation and copper remediation in contaminated dredged sludge\",\"authors\":\"Yang Shen , Nihao Wei , Kewei Fan , Wencheng Qi , Jianting Feng , Zhiqiang Lai\",\"doi\":\"10.1016/j.geotexmem.2025.08.008\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading was employed to simultaneously consolidate and remediate copper-contaminated dredged sludge. Five chemical additives—citric acid, tartaric acid, hydrogen peroxide, rhamnolipids, and sodium chloride—were systematically evaluated via model tests. Results show that all additives improve both drainage and copper removal, with sodium chloride exhibited the enhancement in dewatering performance, while rhamnolipid achieved the highest copper removal efficiencies. Mechanistic analysis revealed that chemical additives improved sludge dewatering by enhancing pore water migration—through modifying soil structure, increasing ionic conductivity, or reducing surface tension. They also promoted copper removal by altering speciation: acidic chelating agents reduced pH and stabilized Cu<sup>2+</sup> in soluble complexes, suppressing precipitation, while in near-neutral conditions, cathodic OH<sup>−</sup> dissolved Cu(OH)<sub>2</sub> into mobile species, facilitating transport. Energy analysis confirmed that chemical-enhanced systems improved the energy efficiency of copper removal. These findings support the integrated use of EKG electro-osmosis combined with vacuum preloading, coupled with appropriate chemical agents, as a viable and energy-efficient strategy for the remediation of heavy metal-contaminated dredged sludge.</div></div>\",\"PeriodicalId\":55096,\"journal\":{\"name\":\"Geotextiles and Geomembranes\",\"volume\":\"53 6\",\"pages\":\"Pages 1600-1609\"},\"PeriodicalIF\":6.2000,\"publicationDate\":\"2025-08-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geotextiles and Geomembranes\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0266114425001025\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, GEOLOGICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geotextiles and Geomembranes","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0266114425001025","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}

引用次数: 0

摘要

采用化学增强电动土工合成材料（EKG）电渗透与真空预压相结合的方法，对铜污染的疏浚污泥进行了同步固结和修复。五种化学添加剂——柠檬酸、酒石酸、过氧化氢、鼠李糖脂和氯化钠——通过模型试验进行了系统的评价。结果表明，各添加剂均能提高脱铜效果，其中氯化钠对脱铜效果有增强作用，鼠李糖脂的脱铜效果最好。机理分析表明，化学添加剂通过改变土壤结构、增加离子电导率或降低表面张力来增强孔隙水迁移，从而改善污泥脱水。它们还通过改变形态来促进铜的去除：酸性螯合剂降低pH值，稳定可溶性配合物中的Cu2+，抑制沉淀，而在接近中性的条件下，阴极OH−将Cu(OH)2溶解成可移动的形态，促进运输。能量分析证实，化学增强系统提高了除铜的能源效率。这些发现支持将心电图电渗透与真空预压相结合，再加上适当的化学剂，作为一种可行且节能的策略来修复重金属污染的疏浚污泥。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading for consolidation and copper remediation in contaminated dredged sludge

Chemical-enhanced electrokinetic geosynthetics (EKG) electro-osmosis combined with vacuum preloading was employed to simultaneously consolidate and remediate copper-contaminated dredged sludge. Five chemical additives—citric acid, tartaric acid, hydrogen peroxide, rhamnolipids, and sodium chloride—were systematically evaluated via model tests. Results show that all additives improve both drainage and copper removal, with sodium chloride exhibited the enhancement in dewatering performance, while rhamnolipid achieved the highest copper removal efficiencies. Mechanistic analysis revealed that chemical additives improved sludge dewatering by enhancing pore water migration—through modifying soil structure, increasing ionic conductivity, or reducing surface tension. They also promoted copper removal by altering speciation: acidic chelating agents reduced pH and stabilized Cu²⁺ in soluble complexes, suppressing precipitation, while in near-neutral conditions, cathodic OH⁻ dissolved Cu(OH)₂ into mobile species, facilitating transport. Energy analysis confirmed that chemical-enhanced systems improved the energy efficiency of copper removal. These findings support the integrated use of EKG electro-osmosis combined with vacuum preloading, coupled with appropriate chemical agents, as a viable and energy-efficient strategy for the remediation of heavy metal-contaminated dredged sludge.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.