Micro-electrolysis - White Rot Fungi Treatment Of Nitrobenzene Wastewater

Using micro-electrolysis as a pretreatment, and white rot fungi (P.C.) for the posttreatment, research on the degradation of high concentration nitrobenzene was carried out. There were discussion about the immobilization of white rot fungi and study on the technical parameters of micro-electrolysis-P.C. process in treating the wastewater.After choosing the most suitable micro-electrolysis working condition, the experiments on the immobilization of white rot fungi were carried out. The results of immobilization experiments indicated that immobilized white rot fungi by absorption had higher efficiency than embedding white rot fungi or free cells. Wood chip and hemp rope are the best carriers compared with others in immobilized white rot fungi by absorption.A white rot fungus biomembrane reactor system was set up with wood chips as carriers. Good results were ascertained in pretreatment of the nitrobenzene through micro-electrolysis, which improved the biochemical degradability, and then the white rot fungus as biochemistry treatment.In optimum condition, the effluent concentration of COD was about 573mg/L, and the removal rate of COD and nitrobenzene was around 36% and 85.8% respectively through micro-electrolysis. After the white rot fungus treatment, the COD can be up to 115mg/L, with meeting the Class II of Integrated Wasterwater Discharge Standard. The removal rate of nitrobenzene and aniline was about 96.85% and 94.62%, and the quality of nitrobenzene of discharge water was about below 2mg/L, which reached the Class I of Integrated Wasterwater Discharge Standard. The total removal rate of nitrobenzene and COD was about 99.56% and 87.16% respectively. The experimental result proved the feasibility of the micro-electrolysis-P.C. process.