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首页> 外文期刊>Environmental research >Performance of electro-osmotic dewatering on different types of sewage sludge
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Performance of electro-osmotic dewatering on different types of sewage sludge

机译：电渗脱水对不同类型污泥的影响

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摘要

The feasibility of pressure-driven electro-dewatering (EDW) on sludge samples taken after different biological processes, stabilisation methods or mechanical dewatering techniques was assessed. First, the influence of potential values on EDW of anaerobically and aerobically stabilised, mechanically dewatered, sludge samples was investigated. Preliminary tests carried out by applying a constant potential (10, 15 and 20 V) in a lab-scale device confirmed the possibility to reach a dry solid (DS) content of up to 42.9%, which corresponds to an increase of 15% of the dry content in dewatered sludge without the application of the electrical field. Dewatering increased with the applied potential but at the expense of a higher energy consumption. A potential equal to 15 V was chosen as the best compromise for EDW performance, in terms of DS content and energy consumption. Then, the influence of the mechanical dewatering was studied on aerobically stabilised sludge samples with a lower initial DS content: the higher initial water content led to a lower final DS content but with a considerable reduction of energy consumption. Finally, the biological process, studied by comparing sludge samples from conventional activated sludge and membrane bioreactor processes, didn't evidence any influence on EDW. Experimental results shown that DS obtained after mechanical dewatering, volatile solids and conductivity are the main factors influencing EDW. Anaerobically digested sludge reached the highest DS content, thanks to lower organic fraction.
机译：评估了在不同的生物过程，稳定化方法或机械脱水技术之后对污泥样品进行压力驱动电脱水（EDW）的可行性。首先，研究了潜在值对厌氧和需氧稳定的，机械脱水的污泥样品的EDW的影响。通过在实验室规模的设备中施加恒定电势（10、15和20 V）进行的初步测试证实，有可能达到42.9％的干固形物（DS）含量，相当于增加15％。在不施加电场的情况下，脱水污泥中的干物质含量。脱水随着所施加的潜力而增加，但是以更高的能耗为代价。就DS含量和能耗而言，选择等于15 V的电势作为EDW性能的最佳折衷方案。然后，研究了机械脱水对具有较低初始DS含量的需氧稳定污泥样品的影响：较高的初始水含量导致较低的最终DS含量，但能耗显着降低。最后，通过比较常规活性污泥和膜生物反应器过程的污泥样品进行研究的生物过程并未证明对EDW有任何影响。实验结果表明，机械脱水后获得的DS，挥发性固体和电导率是影响EDW的主要因素。由于较低的有机物含量，厌氧消化的污泥达到了最高的DS含量。

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  • 来源
    《Environmental research》 |2017年第8期|30-36|共7页
  • 作者

    Simone Visigalli; Andrea Turolla; Paolo Gronchi; Roberto Canziani;

  • 作者单位

    Department of Civil and Environmental Engineering - Environmental Section, Politecnico di Milano, Piazza Leonardo da Vinci, 32,I 20133 Milano, Italy;

    Department of Civil and Environmental Engineering - Environmental Section, Politecnico di Milano, Piazza Leonardo da Vinci, 32,I 20133 Milano, Italy;

    Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, Piazza Leonardo da Vinci, 32, I 20133 Milano, Italy;

    Department of Civil and Environmental Engineering - Environmental Section, Politecnico di Milano, Piazza Leonardo da Vinci, 32,I 20133 Milano, Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Electro-osmosis; Electro-dewatering; Sewage sludge; Electric field;

    机译：电渗;电脱水;污水污泥;电场;

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