腐殖酸促进氯苯类物质厌氧还原脱氯研究进展

Research progress on humic acid promoting anaerobic reduction dechlorination of chlorobenzenes

氯苯类化合物(CBs)具有持久性和高生物毒性等环境危害,六氯苯(Hexachlorobenzene,HCB)为典型CBs之一,广泛存在于垃圾填埋场、湖泊底泥等厌氧环境中,对人类健康造成危害。研究表明厌氧条件下CBs物质能发生还原脱氯现象,且厌氧环境中存在的腐殖酸(humic acids,HA)能促进氯代物降解。通过分析HCB还原脱氯机理、HA氧化还原特性,以及厌氧条件下HA对氯苯类物质还原脱氯作用、腐殖酸还原微生物还原机制,以期为实现源头修复填埋场等厌氧环境中CBs类化合物污染环境提供调控原理。

Chlorobenzene compounds(CBs)are environmental hazards with persistence and high biological toxicity.HCB is one of the typical CBs,it is widely used in anaerobic environments such as landfills and lake sediments which cause harm to human health.Studies have shown that CBs can undergo reductive dechlorination under anaerobic conditions,and humic acid(HA)in anaerobic environment can promote the degradation of chlorinated compounds.In this paper,the dechlorination mechanism of HCB,HA redox characteristics,the mechanism of HA on HCB reduction dechlorination under anaerobic conditions,and the reduction mechanism of HA reduction microorganisms were analyzed,which provided a regulation principle for remediation CBs environmental pollution in anaerobic environments such as source-controlled landfills.