Anodic Reactivity of Ferrous Sulfide Particles Generated in Wastewater Treatment
نویسندگان
چکیده
Ferric phosphate (FePO4) sludge is routinely generated in wastewater treatment by addition of ferric chloride to remove phosphates and precipitate suspended solids. After the addition of sulfide to the FePO4 sludge, insoluble FeS particles are generated, leaving behind a phosphate-rich liquid, which can potentially be used as fertilizer. Electrochemical oxidation of FeS can lead to recovery of ferric iron for reuse in the process. In this study, the reactivity of FeS particles for anodic oxidation at pH 4 was studied as a function of sludge age, showing significantly greater reactivity for young FeS particles. Sulfate formation at E>0.8 V vs. SHE was observed.
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