Biofilm-electrode process with high efficiency for degradation of 2,4-dichlorophenol

2,4-Dichlorophenol (2,4-DCP) from chemical industry wastewaters has caused serious environmental pollution. Removal of 2,4-DCP using either physico-chemical or biological methods is not very efficient. In this paper, a combination of biological and electrochemical methods gave satisfactory results....

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Bibliographic Details
Published in:Environmental chemistry letters 2011-09, Vol.9 (3), p.383-388
Main Authors: Zhang, Xue-Na, Huang, Wei-Min, Wang, Xuan, Li, Huiting, Lu, Hai-Yan, Lin, Hai-Bo
Format: Article
Language:English
Subjects:
2,4-dichlorophenol
Analytical Chemistry
Aromatic compounds
bacteria
Biodegradation
Biofilms
Chemical industry
Chemical industry wastewaters
Chemical oxygen demand
Dechlorination
Earth and Environmental Science
Ecotoxicology
Electrochemistry
Electrodes
Environment
Environmental Chemistry
Geochemistry
Industrial wastewater
Original Paper
oxidation
Pollution
wastewater
Water pollution
Water treatment
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Summary:2,4-Dichlorophenol (2,4-DCP) from chemical industry wastewaters has caused serious environmental pollution. Removal of 2,4-DCP using either physico-chemical or biological methods is not very efficient. In this paper, a combination of biological and electrochemical methods gave satisfactory results. By comparisons of the degradation of 2,4-DCP and the removal of chemical oxygen demand (COD) in electrochemical, biological and biofilm-electrode processes, it was found that the biofilm-electrode process possesses the highest degradation efficiency and removal rate; both the pure electrochemical and the pure biological processes were far less efficient. The removal efficiency of 2,4-DCP using the biofilm-electrode process was 100% in 48 h, while that using the pure electrochemical and the pure biological processes were 62 and 42%, respectively. The experiments show that the current of 5 mA for the cathode of 9 cm2 and the initial concentration 100 mg/l of 2,4-DCP were the optimal parameters of technology for the biofilm-electrode process. The excellent effects are due to the withdrawing electron action of bacterium, electrochemically anodic oxidation and cathodic dechlorination. It is the first time that the biofilm-electrode method was applied in 2,4-DCP degradation. Here, we demonstrated that biofilm-electrode process is a promising method to remove some aromatic compounds in industrial wastewater.
ISSN:1610-3653
1610-3661
DOI:10.1007/s10311-010-0290-2