Fe-Si-Al advanced oxidation catalyst heterogeneous Fenton treatment papermaking waste water
The types of pollutants in papermaking wastewater are numerous,with a relatively large discharge of CODCr.Currently,the conventional homogeneous Fenton process has been widely used for the advanced treatment of papermaking wastewater.However,this process suffers from the problems of high consumption of ferrous sulfate and large sludge produc-tion.This article applies Fe-Si-Al advanced oxidation catalyst derived primarily from conven-tional Fenton sludge in the heterogeneous Fenton treatment of papermaking wastewater.The removal efficiency of CODcr and sludge production are used as evaluation criteria.Modern in-struments such as SEM,XRD,FT-IR are utilized to investigate the application process and reaction mechanisms.The results indicate that when the initial pH of the reaction system is 3,the catalyst dosage is 10 g/L,the ratio of m(CODCr)∶m(H2O2)=1∶1,and the reaction time is 90 minutes,the removal efficiency of CODCr can reach 73.6％,and the sludge produc-tion is reduced by 91.8％compared to conventional Fenton.The iron-aluminum spinel(FeAl2O4)and fayalite(Fe2SiO4)in the catalyst provide Fe2+for the system.After 10 times of recycling,the removal rate of CODCr remained at about 70％,indicating that the catalyst has good recycling performance.Heterogeneous Fenton degrades more types of organic mat-ter than homogeneous Fenton,which can destroy the benzene ring structure.
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