Optimizing and understanding the pressurized vertical electro-osmotic dewatering of activated sludge

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Yu Zhang, Zhejiang Gongshang University, Ningbo Municipal Center for Disease Control and Prevention
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  • Guanghu Lian, Zhejiang Gongshang University, Ningbo Municipal Center for Disease Control and Prevention
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  • Chunying Dong, Zhejiang Gongshang University, Ningbo Municipal Center for Disease Control and Prevention
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  • Meiqiang Cai, Zhejiang Gongshang University, Ningbo Municipal Center for Disease Control and Prevention
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  • Zhijun Song, Zhejiang Gongshang University, Ningbo Municipal Center for Disease Control and Prevention
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  • Yuejing Shi, Zhejiang Gongshang University, Ningbo Municipal Center for Disease Control and Prevention
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  • Liguang Wu, Zhejiang Gongshang University, Ningbo Municipal Center for Disease Control and Prevention
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  • Micong Jin, Ningbo Municipal Center for Disease Control and Prevention, Aarhus University
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  • Zongsu Wei

Pressurized vertical electro-osmotic dewatering (PVEOD) is an emerging mechanical technology for deep dewatering of wastewater sludge. In this study, the influence of main operation variables including sludge dosage, voltage, mechanical pressure on electro-osmotic dewatering was investigated. Response surface method (RSM) was applied to evaluate and optimize the interactive effects of the three major operating variables. The results indicated the optimum conditions to be 2.70 MPa of mechanical pressure, 18.33 V of voltage and 0.0169 kWh/kg water of energy consumption. Layered distribution study was conducted between anode side and cathode side to investigate the vertical changes of moisture content, zeta potential, three-dimensional excitation emission matrix (3D-EEM) spectra of extracellular polymeric substances, the concentration of proteins and polysaccharides. The morphology changes of sludge observed by microscope images unveiled the possible mechanisms of enhancing the sludge dewaterability in the PVEOD process. The electrochemical at electrodes and electro-osmosis are important for interpreting the dryer sludge at anode layer.

Original languageEnglish
JournalProcess Safety and Environmental Protection
Volume140
Pages (from-to)392-402
Number of pages11
ISSN0957-5820
DOIs
Publication statusPublished - Aug 2020

    Research areas

  • Activated sludge, Electro-Osmotic dewatering, Extracellular polymeric substance (EPS), Sludge properties

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