The Pretreatment of Polyvinyl Alcohol Wastewater with Flocculation-Fenton Oxidation Technology Based on Fe²⁺

Abstract:

The polyvinyl alcohol (PVA) wastewater was pretreated by the process of flocculation-Fenton oxidation. Raw wastewater was treated by the different flocculants first. The results showed that when the flocculant FeSO₄ was used, its effect was better than Fe₂(SO₄)₃ and PAC, the dosage of it was 10g/L, under which COD removal efficiency reached 61.72%. The effects of FeSO4 and H₂O₂ addition and pH on treatment effect were studied in the follow-up Fenton oxidation. The results showed that when the addition of FeSO₄ was 20g/L, the dosage of H₂O₂ was 250mL/L, pH was 4, the removal efficiency of COD reached over 90%. The experiments of fractionated adding the reagents showed that the removal rate of COD was significantly higher in the situation of fractionated adding FeSO₄ required in the flocculation and Fenton oxidation process than one-time added. The removal rate of COD changed little when the H₂O₂ fractionated addition in the process of Fenton oxidation.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 3089-3095
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.3089
• Online since: May 2012
• Authors: Shan Hong Lan, Xiu Wen Wu, Yue Ting Wang, Ping Ting Liu
• Keywords: Fe²⁺, Flocculation-Fenton Oxidation Technology, Polyvinyl Alcohol Wastewater

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