Study On Degradation Of Dye Wastewater By Persulfate Oxidation Activated By Ferrous Ion Advanced Oxidation Technology

Persulfate advanced oxidation technology is one of the most potential technology，especially to persistent organic pollutant which were hard to be degraded. However，the effect of dying wastewater treatment by persulfate oxidation activated by ferrouswas affected by many factors，including initial pH，Fe²⁺dosage，S₂O₈^2- dosage，reactiontemperature,et,al. Different result results from different condition. Therefore，the studyon the optimization of persulfate oxidation activated by ferrous and degradationmechanism was positively significant for the development and promotion.This dissertation,with the purpose of PAHs dye wastewater，taking Reactivebrilliant orange KGN as simulative research object，had some degradation experimentson persulfate oxidation activated by ferrous. There were mainly three aspects in thispaper：（1）The characteristics of decolorization and residual sulfate of dye wastewaterwere studied by single factor experiments.（2）Aiming at three goals： highestdecolorization rate，lowest residual sulfate and minimum costing，response surfacemethod（RSM） was utilized to hunt the optimum condition.（3）The Dynamic Behavior ofReactive brilliant orange KGN in oxidation degradation was studied under persulfateoxidation activated by ferrous.The following results were achieved in this paper based on former experimentresearch：①The effect of dying wastewater treatment by persulfate oxidation activated byferrous was affected by initial pH, Fe²⁺dosage S₂O₈^2- dosage, reaction temperature.Reaction was easy to carry in acidic condition than in alkaline or neutral.AppropriateFe²⁺dosage、S₂O₈^2- dosage was proper for the reaction. The higher temperature wasfavorable for persulfate activation by ferrous. Fe²⁺dosage and persulfate dosage werethe key of SO₄^-yield and usage rate.But the effective usage rate of SO₄^-and persulfatewas affected remarkable by over Fe²⁺dosage or much less persulfate dosage.②The dying wastewater degradation was increased by5.6%in the equilibriumsystem than one step system.It was observed that the degradation rate was the highest inthe50%:30%:20%proportion system than one step system，the dying wastewaterdegradation was increased by12.1%③The sequence of significance to dye removal rate was:S₂O₈^2- dosage>Fe²⁺dosage>temperature>initial pH.The dying wastewater degradation was affected remarkable by Fe²⁺/pH,Fe²⁺/temperature alternation effect.Response surfacemethod（RSM） was utilized to analyze the influence of the factors to the responsesstudied. For dying wastewater with a concentration of100mg/L，the optimum conditionswere as follows：pH was3.2323，ferrous dosage was0.2322mmol/L，persulfate dosagewas0.4667mmol/L， temperature was40℃.In these condition， The dye degradationrate reached97.9768%，the reagent costing was1.4905yuan per ton，and the residualsulfate was84.930mg/L. The value of consensus was99.903%.④Under the condition of pH=3.0，T=30℃，the dying wastewater treatment bypersulfate oxidation activated by ferrous of order was1.0467，and apparent kineticequation was V=10^0.181×P^0.3869×A^0.1672×B^0.4928.