Impact of continuous and intermittent supply of electric assistance on high-strength 2,4-dichlorophenol (2,4-DCP) degradation in electro-microbial system.
The high-strength 2,4-DCP, which exists in two states: dissolved and colloidal, was studied by a continuously electro-microbial system (CEMS) and an intermittently electro-microbial system (IEMS). The hydrolysis rate of colloidal 2,4-DCP in the IEMS without electric assistance was much higher than that in the CEMS. However, the degradation rate of the dissolved 2,4-DCP and the dissolved intermediates (2-chlorophenol and 4-chlorophenol) in the IEMS without electric assistance were much lower than that in the CEMS. By adjusting the intermittent operation mode, the degradation time of 2,4-DCP was shortened greatly. Microbial characteristics in the CEMS and the IEMS were different. The correlation analysis for the main factors affecting the hydrolysis was performed by SPSS, and it was found that the correlation coefficient (rp) was -0.912 for extracellular polymeric substances (EPS) content, 0.823 for zeta potential and 0.632 for relative hydrophobicity, respectively.
School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China. Electronic address: caozhanping2012@126.com.
Zhanping
Z
Cao
School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
Minghui
M
Zhang
School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China.
Jingli
J
Zhang
School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
Hongwei
H
Zhang
D001419:Bacteria / Q000378:metabolism; D001674:Bioelectric Energy Sources; D001704:Biopolymers / Q000737:chemistry; D002733:Chlorophenols / Q000302:isolation & purification*; D003102:Colloids / Q000737:chemistry; D004560:Electricity; D005110:Extracellular Space / Q000737:chemistry; D006868:Hydrolysis; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D055672:Static Electricity; D013997:Time Factors
D001704:Biopolymers; D002733:Chlorophenols; D003102:Colloids; C004762:2,4-dichlorophenol
2,4-DCP hydrolysis; Continuously electro-microbial system (CEMS); Intermittently electro-microbial system (IEMS); Microbial characteristics; Zero-order reaction