高氯酸盐在硝酸盐还原条件下的厌氧生物降解  

Anaerobic Biological Reduction of Perchlorate in the Presence of Nitrate

作　　者：王蕊[1] 刘菲[1] 秦莉红[1] 陈鸿汉[1] 

机构地区：[1]中国地质大学水资源与环境学院,北京100083

出　　处：《地球科学（中国地质大学学报）》2012年第2期307-312,共6页Earth Science-Journal of China University of Geosciences

基　　金：水体污染控制与治理科技重大专项项目(No.2009ZX07424-002)

摘　　要：利用厌氧微生物降解法,以醋酸根为碳源,考察了高氯酸盐在不同浓度的硝酸盐还原环境下的生物降解能力,分析硝酸盐对高氯酸盐生物降解的影响.实验结果表明,10mg/L的高氯酸盐在不同浓度硝酸盐环境下均可被富集培养物降解.20mg/L硝酸盐还原环境中,高氯酸盐的降解未受到抑制;在碳源充足的条件下,100mg/L、200mg/L及500mg/L的硝酸盐环境中,高氯酸盐降解出现滞后期,分别为7d、13d和38d.反应初期,高氯酸盐降解滞后是由于硝酸盐为优先级别较高的电子受体,更易于被微生物利用.随着硝酸盐快速降解和亚硝酸盐的累积,高氯酸盐降解停滞可能是由于电子竞争和较高浓度的亚硝酸盐对高氯酸盐降解菌酶活性产生毒性抑制这两方面共同作用的结果.Anaerobic biological reduction of perchlorate in the presence of nitrate using is studied acetate as carbon source.In addition,effects of different nitrate concentrations on perchlorate reduction are researched.The results show that 10 mg/L of perchlorate can be removed by the enriched microorganisms in different nitrate-reducing conditions.Evidence is also presented demonstrating that perchlorate reduction is not inhibited under 20 mg/L nitrate-reducing condition.However,under 100 mg/L,200 mg/L and 500 mg/L nitrate-reducing conditions,perchlorate removal is observed with longer lag periods of 7 d,13 d and 38 d respectively.At the initial period of reactions,nitrate,as a more favorable electron acceptor,is more easily used by the microbes.With the rapid reduction of nitrate and nitrite accumulation,it is reasonable to propose that the electronic competition and the toxic effect of a certain level of nitrite,particularly in large quantity,on the activity of perchlorate-reducing bacteria,may temporarily delay perchlorate biological reduction.

关 键 词：高氯酸盐 硝酸盐 降解 污染控制 环境工程 

分 类 号：X52[环境科学与工程—环境工程]