Study On Bio-Electrochemical Wastewater Of ABS Treatment Technology And Its Mechanism

Electrochemistry-biology coupling technology was proposed in this paper, in order to problems occurred during the treatment of ABS production wastewater, toxicity, and whose composition was complex, COD_Cr was high, and biodegradability was poor. Experimental device and experimental program were developed based on the water conditions, which was obtained by site investigations and analysis of water quality. Two typical pollutants in ABS production wastewater, including acetophenone and acrylonitrile, were treated by Electro-Fenton, and degradation mechanism was analyzed. Furthermore, the use of BAC in ABS production wastewater treatment was studied, and degradation mechanism was also analyzed. And finally, the effect and mechanism of electrochemistry-biology coupling technology in the treatment of ABS wastewater was also studied.Results showed that the effect of Electro-Fenton to acetophenone and acrylonitrile comparatively good. The removal efficiency of acetophenone and acrylonitrile were 98.8% and 100%, and the removal efficiency of COD_Cr were 58.7% , 57.8%, respectively after 3-h electrolysis. The typical pollutant of acetophenone analyzed by three-dimensional fluorescence pattern and UV-vis showed that the degradation of acetophenone followed the removal of COD_Cr .We can get the intermediate products by GC-MS analysis.While treated by BAC, the removal efficiency of COD_Cr was 71.4%, and the value of BOD₅/COD_Cr increased from 0.27 to 0.41 after 3 hours. And during the electrochemistry-biology coupling process, the removal efficiency of COD_Cr were 76.4%, 75.0% and 58.1%, and BOD₅/COD_Cr value increased from 0.27 to 0.46, 0.34 and 0.28, under the voltage of 5V, 10V and 15V, respectively, after 3 hours. It could be inferred from the results that high voltage would inhibit the microbial growth, so the effect was bad, but the high voltage was effective for the persistent organic pollutants. While appropriate voltage promote the growth of microorganisms, so the result was better. In four different voltages trials, three-dimensional fluorescence pattern and UV-vis showed that the effect was remarkable initially. The GC-MS analysis showed that the residual elements of water quality after 3 h was different by different voltage. The residual elements of 0V and 5V were lower toxicity oligomer.But the residual elements undet the voltage of 10 V and 15 V were certain harm and contained the chains of benzene especially 15 V.