Effect of pH on Fe0 and Anaerobic Microorganism Combined Degradation 2,4-Dichlorophenol

Ting Cheng, Chen Chen, Xiao Zhang, Wei- Fang Xie, Hai-Xia Liu


Batch laboratory tests were conducted through inoculating the anaerobic mixed microorganism, to examine the effect of different initial pH on the process of anaerobic biodegradation of 2,4-dichlorophenol(2,4-DCP) in the presence of zerovalent iron (Fe0). Furthermore, the degradation mechanism of the combined system was investigated. The results showed that, The combined use of Fe0 and anaerobic microorganism could accelerate the degradation of 2,4-DCP. Different pH value had a significant impact on the 2,4-DCP degradation of the combined system. The degradation effect was better in neutral or slightly alkaline condition. The optimum initial pH for the degradation of target contaminant was 9 in the combined system. The OH- from Fe0 anaerobic corrosion balanced the organic acid produced by fermenting of glucose effectively, that made the concentration of volatile fatty acid (VFA) remain at a lower level. The corrosion of iron was strong in acidic condition. Ferrous ion was the main corrosive product and the content of ferric ion was lower. Furthermore, the removal rate of COD in combined system at different pH had a relation to the biodegradation of contaminant in some extent.


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