In order to offer technical support for the application of the ferrate system to dyestuff wastewater treatment,the process of treating Congo red(CR)wastewater by Fe3O4 enhanced ferrate system was studied in terms of the process condition and the various influencing factors.The effects of K2FeO4 and Fe3O4 dosages,and value of pH on the treatment effectiveness of CR wastewater were investigated by the single factor test,and the optimal reaction condition was determined by RSM mod-el.As a result of the desk-top experiment,it was showed that in the case of treating CR wastewater(chroma of 433 times and COD mass concentration of 346 mg/L),as 34.65 mg K2FeO4 and 97.53 mg Fe3O4 were fed in batches,respectively,a pH of 6.56,and reaction time was 20 min,the decolorization rate and COD removal rate was up to 88.41％and 60.20％,respectively.Besides,the quenching experiment showed that the active species in the system were Fe(Ⅴ)and Fe(Ⅳ),additionally·OH played a role as well.In summary,addition of Fe3O4 could improve the capacity of K2FeO4 system applied to the treatment of dyestuff wastewater,thus providing a theoretical basis for the practical application of Fe3O4 enhanced ferrate system.
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