Aniline wastewater treatment by Fenton oxidation-coagulation
Fenton-混凝法处理苯胺废水

Aniline wastewater produced during pesticide production is difficult to be treated by biochemical methods due to its high concentrations of COD, strong toxicity and low degradability. In this study, we used Fenton oxidation and its combination with coagulation to treat aniline wastewater. Results showed that the optimum conditions for Fenton oxidation were: pH=6, m(H2O2)/m(COD)=1.8, n(H2O2)/n(Fe2+)=8. The removal efficiencies for COD and chroma were 78.4% and 92.3%, respectively.Fenton treatment significantly improved biodegradability of aniline wastewater, and the value of B/C increased from 0.037 to 0.324.A combination of Fenton oxidation and coagulation by adding 320 mg/L PAC increased the COD and chroma removal efficiencies to 83.6% and 94.8%, respectively. In addition, the combination shortened the treatment period, HRT, so that the required reactor volume decreased.