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Process Optimization of Three-Dimensional Electro-Fenton System for Treatment of Wastewater Produced in Acrylamide Manufacturing Industry

Acrylamid （ AM ） production wastewater is biologically toxic and difficult to treat directly as it contains more ammonia and COD but a low concentration of AM monomer. The production of H 2 O 2 by electrochemical action can be controlled by the electro-Fenton method, which can degrade COD and NH 3 -N simultaneously while effectively improving the biodegradability of wastewater. In this study, the effects of current density, initial pH value, and iron chipping amount on the treatment efficiency of acrylamide-producing wastewater by three-dimensional electro-Fenton method were investigated. The orthogonal test explores the optimum operating parameters. The results show that the optimal process conditions for the single-factor experiment are the current density of 12.5mA/cm 2 , the initial pH value of 3, and the iron chipping amount of 1.25g; the optimum combined process conditions in the orthogonal experimental design are the current density of 15.0mA/cm 2 , the initial pH value of 4, and the iron chipping amount of 1.25g. Currently, the removal of COD and NH 3 -N is 85.0% and 80.1%, which is 2.9% and 13.2% higher than that under the single-factor optimal conditions, respectively. The three-dimensional electro-Fenton method can effectively break the double bond in a monomer and improve the B/C ratio of AM wastewater. The above results can effectively address the issue of NH 3 -N treatment of AM wastewater.