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In response to the constrained efficacy of traditional in situ chemical oxidation and enhanced bioremediation in karst groundwater, novel slow-release materials (SRMs) were prepared employing paraffin and concrete as binding agents. Simulated karst column experiments were performed to characterize the release kinetics and assess the removal performance of these SRMs against typical fuel pollutants (BTX). In this study, slow-release materials were prepared using paraffin and concrete as binders. Column experiments simulating a dynamic karst aquatic environment were conducted to investigate the release behavior of these materials and their efficacy in removing typical fuel contaminants (BTX compounds). The results showed that: Paraffin-based slow-release materials exhibited significant media-specific release behaviour, but their initial burst release of persulfate resulted in increased non-target consumption. Concrete-based slow-release materials demonstrated a more stable release profile and achieved a higher nitrate utilization rate in the remediation system. Although ferrous salt activation improved the oxidation efficiency of persulfate, challenges such as short activation duration (<72hours), limited spatial influence, and low ferrous ion utilization (leading to iron hydroxide precipitation) remained. In karst groundwater, the first-order decay rate constant for benzene series concentration under the slow-release dosing method (0.154d^-1) was higher than that under the continuous dosing method (0.044d^-1), indicating superior removal efficiency with slow-release dosing. The pH buffering effect in the limestone medium delayed persulfate decay, while the sandy medium facilitated the enrichment of functional microorganisms, thereby enhancing bioremediation.

, authors=Wei-xuan LI^{1, 2}, Yu-dao CHEN^{1, 2, *}, Ri-tian DENG¹, Dong-bo TANG¹, Wei YANG¹, authorsList=Wei-xuan LI, Yu-dao CHEN, Ri-tian DENG, Dong-bo TANG, Wei YANG, authorCompany=null, correspAuthors=Yu-dao CHEN, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314923043747627030, articleId=1314923042686468116, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=过硫酸盐缓释材料修复岩溶水燃油污染效能, columnId=1234106386565624579, journalTitle=中国环境科学, columnName=水污染与控制, runingTitle=null, highlight=null, articleAbstract=

针对传统的原位化学氧化和增强生物修复技术在岩溶地下水中的应用效果受限问题，本文基于石蜡和混凝土两种粘合剂制备缓释体，通过开展模拟岩溶水环境的柱实验，研究缓释材料的缓释性能及其对典型燃油污染物（苯系物）的去除效能．结果表明：石蜡类缓释体表现出了显著的介质特异性释放行为，但其过硫酸盐的突释现象会导致非目标消耗增加；混凝土类缓释体缓释平稳，缓释修复体系中硝酸盐利用率高；亚铁盐缓释活化虽能够提升过硫酸盐的氧化效率，但仍然面临活化持续时间短（<72h）、空间范围有限及亚铁离子利用率低（形成氢氧化铁沉淀）的问题；岩溶动水中，缓释投注方式的苯系物浓度下降期准一级衰减速率常数（0.154d^-1）高于连续投注方式（0.044d^-1），缓释投注方式的去除效率更高，其中石灰岩介质中出现的pH值缓冲作用延缓了过硫酸盐的衰减，而砂质介质则更利于富集功能菌增强生物修复效果．

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李炜轩（1992-），男，河南卫辉人，桂林理工大学博士研究生，主要从事污染水文地质学研究．发表论文10篇．liweixuan09@163.com.

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李炜轩（1992-），男，河南卫辉人，桂林理工大学博士研究生，主要从事污染水文地质学研究．发表论文10篇．liweixuan09@163.com.

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