基于过硫酸盐的高级氧化工艺修复有机污染土壤的研究进展  

Persulfate Based-Advanced Oxidation Process for Organic-Contaminated Soil Remediation: A Review

作　　者：李英华[1] 黄天赐 钱杰 孙嘉茹 李海波[1] 吴纪国 LI Yinghua;HUANG Tianci;QIAN Jie;SUN Jiaru;LI Haibo;WU Jiguo(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《环境科学研究》2023年第1期168-179,共12页Research of Environmental Sciences

基　　金：国家重点研发计划项目(No.2019YFC1803802)。

摘　　要：基于硫酸根自由基的高级氧化工艺(sulfate radicals based-advanced oxidation processes, SR-AOPs)因其高效、经济且环境友好等特点,在有机污染土壤的修复领域受到越来越多的关注. SR-AOPs的原理是通过活化过硫酸盐(S_(2)O_(8)^(2-),PS)产生以硫酸根自由基(SO_(4)·^(-))为主的活性氧自由基将有机污染物氧化成CO_(2)、H_(2)O和无害或危害较小的化学物质.本文概述了影响SR-AOPs修复污染土壤的因素,重点总结了SR-AOPs在总石油烃(TPHs)、多环芳烃(PAHs)、多氯联苯(PCBs)、农药等污染土壤修复中的应用,分析了污染物特征、过硫酸盐和活化剂用量、土壤与溶液比等对污染物去除效率的影响,并讨论了SR-AOPs处理对土壤生态的影响.结果表明:活化方式、pH、土壤含水量、土壤有机质等因素会影响SR-AOPs对污染土壤的修复效果.热活化、微波活化、超声波活化、碱活化、基于铁基催化剂活化等方式都有着较好的应用效果,关于零价铁、氧化铁、负载型铁基催化剂等非均相铁基催化剂的应用最多.此外,许多研究将SR-AOPs与其他修复技术进行联合使用,如电动力学修复+PS氧化、土壤淋洗+PS氧化、微生物修复+PS氧化等,均不同程度地强化了对污染物的去除效果,弥补了单一方法的缺点.修复中使用的过硫酸盐、活化剂等化学药剂会改变土壤的有机质含量、矿物质组成、酸碱度等,进而影响土壤中微生物的活动和生长.随着相关研究的深入,对SR-AOPs降解作用的评价不应只停留在降解速率和矿化程度等指标上,建议不断探究污染物降解机理,完善工艺的应用条件,开发新型高效的活化方法,加强对修复后土壤生态恢复的监测.Sulfate radicals based-advanced oxidation processes(SR-AOPs) have attracted more and more attention in the field of soil remediation contaminated by organic compounds due to their high efficiency, low cost and environmental friendliness. The principle of SRAOPs is to generate reactive oxygen radicals dominated by sulfate radicals(SO_(4)·^(-)) by activating persulfate(S_(2)O_(8)^(2-), PS) to oxidize organic pollutants into CO_(2), H_(2)O and harmless or less harmful chemicals. This paper outlines the factors affecting the remediation performance of SR-AOPs. The application of SR-AOPs in the remediation of total petroleum hydrocarbons(TPHs), polycyclic aromatic hydrocarbons(PAHs), polychlorinated biphenyls(PCBs), and pesticide-contaminated soils is summarized. The effects of pollutant characteristics,dosage of persulfate and activator, soil and water ratio on the removal efficiency of pollutants are analyzed. It finally discusses the influence of SR-AOPs treatment on soil ecology. The results show that the activation mode, pH, soil water content and soil organic matter significantly affect the remediation performance of SR-AOPs. Thermal activation, microwave activation, ultrasonic activation, alkali activation, and iron-based catalyst activation have good applications, and heterogeneous iron-based catalysts such as zero-valent iron, iron oxide, and supported iron-based catalysts are widely used. In addition, many studies have combined SR-AOPs with other remediation techniques, such as electrodynamic remediation+PS oxidation, soil leaching+PS oxidation, microbial remediation+PS oxidation, etc., all of which have enhanced the pollutants removal to varying degrees. Chemicals such as persulfate and activator used in remediation will change the soil organic matter content, mineral composition, pH, etc., thereby affecting the activity and growth of microorganisms. The authors present the application outlook for SR-AOPs that with the deepening of relevant research, the evaluation of SR-AOPs effectiveness should not only

关 键 词：过硫酸盐(PS) 活化 硫酸根自由基(SO4·-) 土壤修复 有机污染物 

分 类 号：X53[环境科学与工程—环境工程]