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Promoting degradation of 2,4-dichlorophenoxyacetic acid with fermentative effluents from hydrogen-producing reactor
Chemosphere ( IF 8.8 ) Pub Date : 2018-03-12 , DOI: 10.1016/j.chemosphere.2018.03.072
Zhiman Yang , Xiaoshuang Shi , Meng Dai , Lin Wang , Xiaohui Xu , Rongbo Guo

Abstract

This research aims to identifying the potential effect of using a hydrogen-producing reactor´s effluent as an enrichment amendment for enhancing the degradation rates of 2,4-dichlorophenoxyacetic acid (2,4-D) during the bioremediation of contaminated paddy soils. The results showed that addition of the effluents to 2,4-D- degrading enrichment culture enhanced (up to 1.3-fold) the degradation rate constant of 2,4-D. The enhancement effect most probably resulted from the co-metabolic degradation of 2,4-D facilitated by volatile fatty acids (e.g., acetate, propionate, and butyrate) in the effluents which served as the beneficial substrates. Results from DNA sequencing analysis showed that the effluent additions shifted the bacterial community composition in the enrichment culture. Dechloromonas and Clostridium were two dominant bacterial genera involved in 2,4-D degradation. The findings will make a substantial contribution to remediation of soils contaminated with 2,4-D.



中文翻译:

用产氢反应器中的发酵废水促进2,4-二氯苯氧基乙酸的降解

摘要

这项研究旨在确定使用产氢反应器的废水作为富集修正剂来提高受污染稻田土壤生物修复过程中2,4-二氯苯氧基乙酸(2,4-D)降解速率的潜在影响。结果表明,向2,4-D降解富集培养物中添加废水可提高(高达1.3倍)2,4-D的降解速率常数。增强效果最可能是由于用作有益底物的废水中的挥发性脂肪酸(例如乙酸盐,丙酸盐和丁酸盐)促进了2,4-D的共代谢降解。DNA测序分析的结果表明,废水的添加改变了富集培养中细菌群落的组成。脱氯莫纳斯梭菌是参与2,4-D降解的两个主要细菌属。这些发现将对修复受2,4-D污染的土壤做出重大贡献。

更新日期:2018-03-12
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