微生物量对“Fe~0-厌氧微生物”联合降解2,4-DCP的影响
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摘要
实验考察不同微生物量时零价铁(Fe~0)与微生物联合降解2,4-二氯酚(2,4-DCP)的效果及机理。结果表明:联合体系对目标物降解效果随微生物量增加而提高,生物量为146.25 mg VSS/L时2,4-DCP降解效果最佳。单独微生物对2,4-DCP有较强降解作用,而不同生物量时联合体系目标物降解效果均优于单独体系。联合体系与单独微生物体系反应过程pH值均有一定波动,而联合体系反应过程中的pH值高于单独微生物体系。不同微生物量时联合体系Fe~0生成的相应的铁腐蚀产物大多为Fe~(2+)离子。
The effect and mechanism of 2,4- dichlorophenol( 2,4- DCP) degradation were studied by the combination use of zero-valent iron( Fe~0) and microorganisms at different microbial biomass. The results showed that the degradation effect of the combined system on the target pollutants was improved with the increase of microbial biomass.The degradation effect of 2,4- DCP was the best when the microbial biomass was 146. 25 mg VSS / L. The effect of individual microbial action on 2,4-DCP was stronger,and the degradation efficiency of the combined system was better than that of the single microbial system. The p H value of the reaction process in the combined system and the individual microbial system had some fluctuation,while the p H value of the combined system was higher than that of the single microbial system. The corresponding iron corrosion products produced by the combined system of Fe~0 with different microbial biomass were mostly Fe~(2+) ions.
The effect and mechanism of 2,4- dichlorophenol( 2,4- DCP) degradation were studied by the combination use of zero-valent iron( Fe~0) and microorganisms at different microbial biomass. The results showed that the degradation effect of the combined system on the target pollutants was improved with the increase of microbial biomass.The degradation effect of 2,4- DCP was the best when the microbial biomass was 146. 25 mg VSS / L. The effect of individual microbial action on 2,4-DCP was stronger,and the degradation efficiency of the combined system was better than that of the single microbial system. The p H value of the reaction process in the combined system and the individual microbial system had some fluctuation,while the p H value of the combined system was higher than that of the single microbial system. The corresponding iron corrosion products produced by the combined system of Fe~0 with different microbial biomass were mostly Fe~(2+) ions.
引文
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[2]戴友芝,施汉昌,冀静平,等.含五氯酚废水的生物降解性和微生物毒性试验[J].环境科学,2000,21(2):40-45.
[3]李建华,戴友芝,杨大森.几种氯酚的生物降解性及其对厌氧产甲烷毒性的试验研究[J].湖南工程学院学报,2006,16(3):83-87.
[4]刘英艳,刘勇弟.碱性条件下UV/Fe EDTA/H2O2降解2,4-二氯苯酚的研究[J].环境科学与技术,2006,29(5):17-18,23.
[5]郜瑞莹,王建龙.p H对厌氧颗粒污泥吸附4-氯酚的影响[J].环境科学,2007,28(4):791-794.
[6]罗春香,戴友芝,史雷,等.Fe0/厌氧微生物联合体系降解硝基苯的研究[J].微生物学通报,2009,36(2):160-164.
[7]Rosenthal H,Adrian L,Steiof M.Dechlorination of PCE in the presence of Fe0enhanced by a mixed culture containing two Dehalococcoides strains[J].Chemosphere,2004,55:661-669.
[8]Fernandez-Sanche J M,Sawvel E J,Alvarez P J J.Effect of Fe0quantity on the efficiency of integrated microbial-Fe0treatment processes[J].Chemosphere,2004,54:823-829.
[9]程婷,戴友芝,黄兆琴,等.Fe0-厌氧微生物降解2,4-二氯酚的效应及机理[J].环境科学与技术,2012,35(5):32-35.