“Fe^0/优势脱氯菌”体系降解2,4,6-TCP特性及机制研究  

Characteristics and Mechanism of 2,4,6-TCP Degradation by the "Fe^0/Enriched-Bacteria" System

作　　者：戴友芝[1] 郭丽丽[1] 史雷[1] 刘智勇[1] 高宝钗[1] 

机构地区：[1]湘潭大学环境科学与工程系,重金属污染控制湖南省高校重点实验室,湘潭411105

出　　处：《环境科学》2012年第8期2741-2746,共6页Environmental Science

基　　金：国家自然科学基金项目(20977072)

摘　　要：采用批处理实验方式,对"Fe0/优势脱氯菌"体系降解2,4,6-TCP过程进行研究,探讨了零价铁与微生物的协同作用及其机制.结果表明,Fe0对微生物具有促进生长和界面富集的作用,"Fe0/优势脱氯菌"体系菌浓度(D600表示)是单独优势脱氯菌体系的约1.7倍,反应96 h铁表面有大量细菌附着生长,其形态呈现短杆状或类球状;Fe0腐蚀产生的OH-对体系酸化起平衡调节作用,在pH值7.0、Fe0浓度5 g.L-1、2,4,6-TCP浓度30 mg.L-1的初始条件下,体系pH值稳定在7.8左右,有利于2,4,6-TCP还原脱氯反应的进行和优势脱氯菌的生长;2,4,6-TCP的主要降解路径为2,4,6-TCP→2,4-DCP→4-CP.The synergistic mechanism of 2,4,6-trichlorophenol（TCP） degradation using a combination of Fe0and anaerobic dechlorinating bacteria with batch processing was investigated.Experimental results showed that under the conditions of pH 7.0,Fe0 5 g·L-1 and 2,4,6-TCP 30mg·L-1,the growth and interface enrichment of enriched-bacteria could be promoted by Fe0,the cell mass（expressed by D600） of Fe0/enriched-bacteria was about 1.7 times as high as that of the individual predominant groups of dechlorinating bacteria.After 96 h reaction,large amount of bacteria attached to the iron surface,with short rod or coccus-like morphology.The pH value of the system was maintained at 7.8,which could be beneficial to the reductive dechlorination reaction and the growth of the enriched-bacteria.The major pathway of 2,4,6-TCP degradation in the Fe0/enriched-bacteria system was 2,4,6-TCP to 2,4-DCP and then to 4-CP.

关 键 词：v Fe0/优势脱氯菌 2 4 6-TCP 还原脱氯 界面富集 降解路径 Fe^0/优势脱氯菌 2 4 6-TCP 还原脱氯 界面富集 降解路径 

分 类 号：X172[环境科学与工程—环境科学] X703.1