Treatment of wastewater from acrylonitrile-butadiene-styrene (ABS) resin manufacturing by Fe0/GAC-ABFB

A feasible method for treatment of the wastewater from the ABS resin manufacturing process, based on combined Fe-0/GAC and aerated biological fluidized bed (ABFB), was developed. Meanwhile the effect of operating temperature and HRT on the decomposition or transformation of main pollutants by Fe-0/GAC reactor was investigated in this study. On conditions of HRT 4 h and operating temperature 30 degrees C in Fe-0/GAC reactor, the COD removal efficiency and NH4-N transformation efficiency were 30-45% and 50-60%, respectively. In addition, the lower temperature (e.g., 5 degrees C) would limit the activity and treatment efficiency of Fe-0/GAC reactor, while this reactor could recover its activity and obtain high COD removal efficiency at the higher operating temperature (e.g., 30 or 60 degrees C). The deep treatment of the effluent of Fe-0/GAC reactor was performed by ABFB reactor, and the COD removal efficiency reached 90-95%. The decomposition or transformation of the aromatic compounds and organic nitriles in ABS resin wastewater was analyzed by UV-vis and FTIR. The experimental results indicate that the Fe-0/GAC-ABFB system could perform a good treatment for the ABS resin wastewater and meet the discharge standard in China. (C) 2012 Elsevier B.V. All rights reserved.