Application Of Three Dimensional Electrode-Biofilm Coupling Technology For The Treatment Of Chlorobenzene Waste Gas

Chlorobenzene(CB)is widely used in pesticides,chemicals,pesticides and other fields.It has adverse effect on humans and animals.It is very stable in the environment and difficult to treat.Therefore,the development of economical and efficient waste gas treatment methods is gradually notable.In this paper,three-dimensional electrode biofilm coupling technology was applied to treat chlorobenzene waste gas.The conditions affecting the treatment effect were investigated and the biofilm characteristics were analyzed.It provides a new choice for the treatment of Cl-VOCs,which is of positive significance to reduce waste gas pollution and improve the quality of atmospheric environment.Three dimensional electrode reactor(3DER)and magnetic field-three dimensional electrode reactor(MF-3DER)were set up in three dimensional electrode system.The three dimensional biofilm reactor(3DBR),three dimensional biofilm electrode reactor(3DBER)and magnetic field three dimensional biofilm electrode reactor(MF-3DBER)were set up in three dimensional biofilm electrode system.The best conditions for degrading:EBRT was 86.4 s,the chlorobenzene concentration was at about 2.0 g/m~3,the nutrient solution was sprayed 4.0 h/2.0 min and the current density was 0.33 A/m~2.In the three dimensional electrode system:The RE and EC were MF-3DER>3DER,Esp was MF-3DER<3DER.In the three dimensional biofilm electrode system:The RE and EC were MF-3DBER>3DBER>3DER,Esp was MF-3DBER<3DBER.In the determination of EPS(protein,polysaccharide)content:under the condition of medium chlorobenzene concentration,the content of protein and polysaccharide on the anode,cathode and particle electrode were the highest,the order of protein and polysaccharide content in the three reactors was MF-3DBER>3DBER>3DBR.It was found that the current was negatively correlated with protein and polysaccharide contents in the three reactors.The order of polysaccharide content at anode,cathode and particle electrode of the three reactors was MF-3DBER>3DBER>3DBR.The average protein content at high current at anode and particle electrode was MF-3DBER>3DBR>3DBER,and at cathode was 3DBR>MF-3DBER>3DBER,which confirmed the experimental results at continuous operation stage.The results of high-throughput sequencing showed that the dominant bacterial phyla for degrading chlorobenzene was Proteobacteria,the abundance was 60.42%;the dominant genera was Rhodococcus,the abundance was 60.04%.The coupling of magnetic field,electrochemistry and biofilm system could improve the diversity of microbial community.Under the influence of electric current and magnetic field,the dominant bacteria improved.