Aniline degradation was investigated using the conventional Fenton process and an electro-Fenton (EF) process with plate and rod electrode EF reactors. The performance of the two EF reactors was evaluated by determining the effect of important parameters (Fe2+, H2O2, and aniline concentrations) on the aniline removal efficiency and the initial aniline degradation rate. The change in the biochemical oxygen demand (BOD5) and ratio BOD5/COD of a high concentration of aniline were also studied.
Experimental results reveal that compared with conventional Fenton process, aniline degradation and chemical oxygen demand (COD) removal in the EF process increased 43% and 10%, respectively. In the two EF reactors, the aniline was completely degraded (100%) when the ratio of [H2O2]:[Fe2+]:[aniline] was 5.8:0.1:1. Within the range of Fenton's reagent used in the two reactors, controlling the H2O2 concentration was the key point of promoting the aniline oxidation. The plate electrode system had a higher efficiency than rod electrode system in terms of H2O2 efficiency, due to the reactor design of decreasing the electrical resistance. Treatment with a high concentration aniline increased biodegradability (BOD5 and ratio BOD5/COD) of pollutant when plate and rod electrode EF reactors were used. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 1111–1117, 2013