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Electro-dewatering of activated sludge: Electrical resistance analysis
Jean-Baptiste Conrardy1, Jean Vaxelaire1, Jérémy Olivier1
1Laboratoire de Thermique Energétique et Procédés (EAD 1932), UPPA, ENSGTI, rue Jules Ferry, BP 7511, 75075 Pau Cedex, France.
Water Research
|May 19, 2016
Summary
Electric resistance in electro-dewatering (EDW) increases sharply above 45% solids content, impacting energy use. Using conductive filters can lower resistance and energy consumption during dewatering.
Area of Science:
- Electrochemistry
- Chemical Engineering
- Materials Science
Background:
- Electro-dewatering (EDW) technology faces challenges from ohmic heating and high energy consumption.
- Understanding electric resistance is crucial for optimizing EDW processes.
Purpose of the Study:
- To quantitatively analyze the behavior of electric resistance in electro-dewatering.
- To identify factors influencing electric resistance during the dewatering process.
Main Methods:
- Measurement of electric resistance of the cake and filter cloth system.
- Analysis of resistance variations with cake dryness and solids loading.
- Comparison of standard and conductive filter cloths.
Main Results:
- System electric resistance significantly increases when solids content exceeds approximately 45%.
- Filter cloth resistance constitutes about 20% of total resistance, increasing sharply at terminal stages.
- Conductive filters reduce overall electric resistance and energy consumption.
- Electric resistance decreases from anode to cathode within the cake.
Conclusions:
- Cake dryness is a primary determinant of electric resistance in EDW.
- Conductive filter materials offer a viable strategy to mitigate energy consumption.
- Spatial variations in resistance are linked to ion migration, solids content, and electrolysis byproducts.
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