Effects of Piecewise Electric Field Operation on Sludge Dewatering: Phenomena and Mathematical Model

Abstract

Electro-dewatering (EDW) is an energy-efficient method for sludge dewatering. In this study, effects of piecewise electric field operation on EDW were investigated by experiments and simulation. Operational parameters were studied mainly in terms of sludge resistance variation during electro-dewatering process, which were evaluated by linear sweep voltammetry (LSV) analysis. Simulation of the sludge cake electro-dewatering processes was developed and validated, based upon timedependent experimental data of electric currents and filtrate weights. The modeling results were in good agreement with experiments. It was proved by experimental and modeling results that the piecewise operation has positive effects on key performances of EDW devices, that is, limited water content, space-time yield, and mass specific energy consumption.

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

“…The dry solid DS concentration of the conditioned sludge by the electrochemical-Fenton process was increased from 2.3% to 41%. Furthermore, the estimated cost of conditioning using this method is $41.82 USD/t DS . The electrochemical-Fenton has fewer limitations than other methods (Fenton, Fenton-lime, and FeCl 3 -lime), so it can be considered as a new alternative to wastewater industries.…”

“…Furthermore, the estimated cost of conditioning using this method is $41.82 USD/t DS. 193 The electrochemical-Fenton has fewer limitations than other methods (Fenton, Fentonlime, and FeCl 3 -lime), so it can be considered as a new alternative to wastewater industries.…”

New Insight on the Combined Effects of Hydrothermal Treatment and FeSO4/Ca(ClO)2Oxidation for Sludge Dewaterability Improvement: Moisture Distribution and Noncovalent Interaction Calculation

“…The key factor of the sludge dewatering problem is the extracellular polymeric substances (EPSs) and the oxygen-containing groups in it, causing the hydrophilicity of sludge. Methods have been conducted to improve sludge dewaterability, for example, electric field, flocculant, , cationic surfactant, biomass and advanced oxidation process (AOP), , acidification and ultrasound, and hydrothermal treatment. , …”