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The feasibility of using electrokinetic processes for dewatering and pathogen inactivation of biosolids was evaluated on a bench scale. Raw primary sludge blended with the secondary biological sludge from the wastewater treatment plant in Laval (Quebec) was used. Six electrokinetic cells have been used in this study and a conditioner was also added to two cells. Potential gradients of 0.5, 1.0, and 1.5 V/cm were applied to the cells. Electrical parameters were measured and water was collected from the cathode area. Results showed the capability of dewatering to 62% TS or 38% water content. The highest solids content was achieved in the cell with the higher voltage in the presence of the conditioner. No fecal coliforms were observed in cells with conditioner. Under optimal operating conditions, the cell with a potential gradient of 1.5 V/cm exhibited the consumption of energy at 220 kWh/m3 of biosolids. This method of dewatering appeared to have technical and economic merit and warrants further investigation.
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Document Type: Research Article

Publication date: 2005-01-01

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