Abstract
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 2.70MPa of mechanical pressure, 18.33V of voltage and 0.0169kWh/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.
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