Mechanism of Fulvic Acid Removal from MBR Effluent in an Incineration Plant Leachate Treatment System by Sodium Persulfate Oxidation with Electrochemistry Coprocessing
In order to effectively remove fulvic acid from membrane bioreactor(MBR)effluent in an incineration plant leach-ate treatment system,a two-stage persulfate oxidation with electrochemistry cooperation method was employed.The stainless steel and Ti/IrO2-coated electrodes,the graphite and graphite were set as both cathode and anode for the primary and the sec-ondary reaction cells,respectively.The influences of two main factors,peroxydisulfate(PDS)dosage and current density,on fulvic acid degradation mechanisms were explored through quenching experiments.The results showed that when PDS=12 g/L and J=14.7 mA/cm2,the removal rate of fulvic acid reached 88.70％in the primary reaction cell under*PDS oxidation,OH oxidation and Fe(OH)3 flocculation.Different from other mechanisms,the*PDS oxidation was remarkably enhanced with the proper increase of PDS.The OH oxidation could be significantly promoted by increasing current density.When no PDS dosing and J=14.7 mA/cm2 in the secondary reaction cell,the total removal rate of fulvic acid for the two-stage reaction cells could reach 95.55％.In the secondary reaction cell,the fulvic acid was removed mainly by*PDS oxidation and OH oxidation with low or medium current density.When current density increased,OH oxidation was more significant than*PDS oxidation.
fulvic acidpersulfate oxidation with electrochemistry cooperationmechanismstwo-stage reactor cellsMBR effluentleachate from an incineration plant
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维普
