Optimizing and understanding the pressurized vertical electro-osmotic dewatering of activated sludge
| Autor: | Song Zhijun, Zhang Yu, Lian Guanghu, Meiqiang Cai, Liguang Wu, Micong Jin, Yuejing Shi, Zongsu Wei, Chunying Dong |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
IONS
Environmental Engineering Materials science General Chemical Engineering SEWAGE-SLUDGE 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences Electrochemistry OXIDATION 01 natural sciences law.invention Electro-Osmotic dewatering Extracellular polymeric substance law Zeta potential Environmental Chemistry DEWATERABILITY Safety Risk Reliability and Quality OPTIMIZATION Water content 0105 earth and related environmental sciences 021110 strategic defence & security studies Sludge properties Extracellular polymeric substance (EPS) DOSAGES Dewatering Cathode Anode Activated sludge Chemical engineering |
| Zdroj: | Zhang, Y, Lian, G, Dong, C, Cai, M, Song, Z, Shi, Y, Wu, L, Jin, M & Wei, Z 2020, ' Optimizing and understanding the pressurized vertical electro-osmotic dewatering of activated sludge ', Process Safety and Environmental Protection, vol. 140, pp. 392-402 . https://doi.org/10.1016/j.psep.2020.05.016 |
| DOI: | 10.1016/j.psep.2020.05.016 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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