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电渗透耦合Fe2+-过硫酸钠污泥脱水过程中EPS的变化特性

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李亚林, 刘蕾, 张景玉, 任萌萌, 李可心, 杨瑞丽. 电渗透耦合Fe2+-过硫酸钠污泥脱水过程中EPS的变化特性[J]. 环境工程学报, 2019, 13(2): 431-440. doi: 10.12030/j.cjee.201807234
引用本文: 李亚林, 刘蕾, 张景玉, 任萌萌, 李可心, 杨瑞丽. 电渗透耦合Fe2+-过硫酸钠污泥脱水过程中EPS的变化特性[J]. 环境工程学报, 2019, 13(2): 431-440. doi: 10.12030/j.cjee.201807234
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LI Yalin, LIU Lei, ZHANG Jingyu, REN Mengmeng, LI Kexin, YANG Ruili. Variation characteristics of extracellular polymeric substances in sewage sludge dewatering by coordination of electro-osmotic and Fe2+- sodium persulfate oxidation process[J]. Chinese Journal of Environmental Engineering, 2019, 13(2): 431-440. doi: 10.12030/j.cjee.201807234
Citation: LI Yalin, LIU Lei, ZHANG Jingyu, REN Mengmeng, LI Kexin, YANG Ruili. Variation characteristics of extracellular polymeric substances in sewage sludge dewatering by coordination of electro-osmotic and Fe2+- sodium persulfate oxidation process[J]. Chinese Journal of Environmental Engineering, 2019, 13(2): 431-440. doi: 10.12030/j.cjee.201807234
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电渗透耦合Fe2+-过硫酸钠污泥脱水过程中EPS的变化特性

  • 1.

    河南工程学院资源与环境学院，郑州 451191

  • 基金项目:

    河南省科技攻关项目162102310402

    郑州市科技攻关项目20150237

    河南工程学院博士基金项目D2015008河南省科技攻关项目(162102310402)

    郑州市科技攻关项目(20150237)

    河南工程学院博士基金项目(D2015008)

Variation characteristics of extracellular polymeric substances in sewage sludge dewatering by coordination of electro-osmotic and Fe2+- sodium persulfate oxidation process

  • 1.

    School of Resources and Environment, Henan Institute of Engineering, Zhengzhou 451191, China

  • Fund Project:

  • 摘要: 为了考察电渗透耦合Fe2+-过硫酸钠污泥深度脱水的机制，采用自制装置对市政污水处理厂的污泥进行了脱水研究。系统研究了在不同电压梯度、机械压力、过硫酸钠投加量、Fe2+与过硫酸钠比例、阴阳极间距等操作条件下，污泥中胞外聚合物(EPS)的组成及分布对污泥脱水效果的影响。结果表明，电渗透耦合Fe2+-过硫酸钠可以改善污泥的脱水效果，过硫酸钠经过Fe2+和热活化作用产生的硫酸根自由基对污泥中EPS的破坏作用明显，从而造成EPS特性改变。其中，紧密型胞外聚合物(TB-EPS)中的蛋白质和多糖、松散型胞外聚合物(LB-EPS)中的蛋白质及各层EPS中的蛋白质/多糖与污泥脱水效果存在显著相关性；黏性胞外聚合物(S-EPS)和LB-EPS中的多糖与污泥脱水效果存在显著相关性。TB-EPS、LB-EPS及其中含有的蛋白质和多糖含量是影响污泥电渗透耦合Fe2+-过硫酸钠脱水效果的主要因素。
    Abstract: In order to investigate the mechanisms of sewage sludge dewatering by coordination of electro-osmotic and Fe2+-sodium persulfate oxidation process, the dewatered sludge from a sewage treatment plant was treated by a self-made experimental device. The effects of EPS constituent and distribution on sludge dewatering behavior were investigated under the different voltage gradients, mechanical pressures, persulfate dosages, the ratios of Fe2+ and sodium persulfate, and anode-cathode distances. The results showed that sludge dewatering effect can be improved by the coordination process of electro-osmosis and Fe2+-sodium persulfate oxidation. The sulfate radical anions produced from sodium persulfate activated by Fe2+ and thermal activation presented an obvious damage to EPS in the sludge, thus the EPS characteristics changed. The protein in tightly bound extracellular polymeric substances (TB-EPS) and loosely bound extracellular polymeric substances (LB-EPS) and the ratio of protein to polysaccharide in three layer EPS significantly correlated with the sludge dewatering effect, so did the polysaccharide in TB-EPS, in slime extracellular polymeric substances (S-EPS) and LB-EPS. The TB-EPS, LB-EPS, and their protein, polysaccharide contents are the primary factors affecting sludge dewatering by the coordination process of electro-osmosis and Fe2+- sodium persulfate oxidation.
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  • 刊出日期:  2019-02-02

电渗透耦合Fe2+-过硫酸钠污泥脱水过程中EPS的变化特性

  • 1. 河南工程学院资源与环境学院，郑州 451191
基金项目:

河南省科技攻关项目162102310402

郑州市科技攻关项目20150237

河南工程学院博士基金项目D2015008河南省科技攻关项目(162102310402)

郑州市科技攻关项目(20150237)

河南工程学院博士基金项目(D2015008)

摘要: 为了考察电渗透耦合Fe2+-过硫酸钠污泥深度脱水的机制，采用自制装置对市政污水处理厂的污泥进行了脱水研究。系统研究了在不同电压梯度、机械压力、过硫酸钠投加量、Fe2+与过硫酸钠比例、阴阳极间距等操作条件下，污泥中胞外聚合物(EPS)的组成及分布对污泥脱水效果的影响。结果表明，电渗透耦合Fe2+-过硫酸钠可以改善污泥的脱水效果，过硫酸钠经过Fe2+和热活化作用产生的硫酸根自由基对污泥中EPS的破坏作用明显，从而造成EPS特性改变。其中，紧密型胞外聚合物(TB-EPS)中的蛋白质和多糖、松散型胞外聚合物(LB-EPS)中的蛋白质及各层EPS中的蛋白质/多糖与污泥脱水效果存在显著相关性；黏性胞外聚合物(S-EPS)和LB-EPS中的多糖与污泥脱水效果存在显著相关性。TB-EPS、LB-EPS及其中含有的蛋白质和多糖含量是影响污泥电渗透耦合Fe2+-过硫酸钠脱水效果的主要因素。

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