Effect of Fe0/H2O2 on the performance and mechanism of forward osmosis treatment of practical printing and dyeing wastewater |
Authors: Wu Qianqian, Huang Manhong, Song Jialing, Zheng Shengyang |
Units: College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China |
KeyWords: Fe0/H2O2 system; Printing and dyeing wastewater; Forward osmosis; Membrane; |
ClassificationCode:X703.1 |
year,volume(issue):pagination: 2021,41(5):105-113 |
Abstract: |
Fe0/H2O2 system is used as the forward osmosis (FO) pretreatment technology for treating effluent from the secondary sedimentation tank of a printing and dyeing wastewater treatment plant. Through analyzing the effects of Fe0 dosage, H2O2 dosage and pH on the removal rate of COD and UV254 under different reaction time, the optimal experimental conditions for pretreatment are determined. The effects of pretreatment on the properties of FO and membrane fouling were investigated, and the mechanism of the effects was analyzed by SEM, contact Angle, EEM, XPS and other characterization methods. The results show that under the optimal pretreatment conditions, namely 1.5 g/L and 10 mM Fe0 and H2O2 dosage, pH=2~3 and reaction time of 60 min, the decrease rate of specific flux of FO membrane can be greatly slowed down, and the rejection rate of FO membrane to pollutants is increased by more than 10%. The XPS characterization of Fe0 before and after the reaction verified that hydroxyl radicals and iron (hydrogen) oxides, which can effectively remove organic matter, were produced in the reaction process of Fe0 and H2O2. The EEM before and after the wastewater treatment showed that the Fe0/H2O2 system produced significant degradation of protein samples and SMP substances in the wastewater. The SEM and contact Angle measurements on the membrane surface show that Fe0/H2O2 pretreatment can significantly reduce the FO membrane fouling. |
Funds: |
国家重点研发计划(2019YFC0408304);中央高校基本科研业务费专项资金资助(2232020G-04) |
AuthorIntro: |
第一作者简介:邬倩倩(1997— ),女,湖北孝感人,硕士研究生,研究方向:正渗透的组合工艺及其应用。E-mail:qianqianwu18@163.com。 |
Reference: |
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