高级氧化技术修复萘污染土壤和地下水研究进展

Research Progresses on Advanced Oxidation Technologies to Remediate Naphthalene-contaminated Soil and Groundwater

多环芳烃是土壤和地下水中普遍存在的持久性有机污染物。其中,萘是结构最简单的多环芳烃,具有迁移性强的特点,可通过多种途径在土壤和地下水中富集,是焦化、化工等历史遗留地块重点关注的污染物之一。高级氧化技术高效、安全且经济,因此,基于高级氧化的萘污染土壤和地下水修复技术受到越来越多的关注。本文综述了芬顿和类芬顿氧化、臭氧氧化和过硫酸盐氧化的反应机理,重点阐述了二价铁、微纳级零价铁、铁矿物、铁螯合物等均相及非均相活化剂活化的氧化技术在修复萘污染土壤和地下水方面取得的研究进展,介绍了多种高级氧化技术联合修复以及高级氧化技术与生物降解技术协同修复的研究现状,指出了目前萘的高级氧化技术研究存在的问题,并对研究做出了展望。

Polycyclic aromatic hydrocarbons are persistent organic pollutants that are ubiquitous in the soil and groundwater.Having the simplest structure,naphthalene is one of polycyclic aromatic hydrocarbon,which is characterized by strong mobility and can accumulate in soil and groundwater through a variety of pathways.It has become the most important contaminant of concern in historically abandoned coking and chemical contaminated sites.As advanced oxidation technologies(AOTs)are efficient,safe and economical,their utilization for the treatment of naphthalene-contaminated soil and groundwater has attracted significant attention.This article reviews the reaction mechanism of AOTs such as Fenton and Fenton-like,ozone and persulfate oxidation,focusing on the progresses obtained on the application of activation technologies by homogeneous and heterogeneous activators such as divalent iron,zero-valent iron,micro-and nano-scale zero-valent iron,iron minerals,iron chelates etc.,in the remediation of naphthalene-contaminated soil and groundwater,introduces the research statuses on combined remediation using multiple AOTs and synergistic remediation between AOTs and biodegradation technologies,and the existing problems and future prospects on AOTs are also highlighted.