Performance evaluation of electrodewatering system for sewage sludges |
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Authors: | Jae-Keun Lee Hee-Soo Shin Chan-Jung Park Chang-Geon Lee Jung-Eun Lee Young-Whan Kim |
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Affiliation: | (1) School of Mechanical Engineering, Pusan National University, San 30, Changjeon-Dong, Keumjeong-Ku, 609-735 Busan, Korea;(2) Industry and Technology Div., Busan Metropolitan Gov., 611-735 Busan, Korea |
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Abstract: | A laboratory-scale electrodewatering system, incorporating an electric field as an additional driving force to conventional
pressure dewatering, has been developed to decrease the water content of sludges generated in wastewater treatment. Consisting
of a piston-type filter press, a power supply and a data acquisition system, the electrodewatering system’s performance was
evaluated as a function of applied pressure, applied voltage, sludge type and filtration time. Experiments were carried out
using sewage sludges with the electric field up to 120 V/cm and pressure ranging from 98.1 to 392.4 kPa. Electrodewatering
involving a combination of electric field and pressure enhances both the dewatering rate and final dewatered volume. The final
water content of sewage sludges in the electrodewatering system can be reduced to 62 wt%, as compared to 78 wt% achieved with
the pressure filtration alone. The electrodewatering system shows the potential to be an effective method for reducing the
water content in sludges. |
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Keywords: | Electrodewatering Electrophoresis Electroosmosis Final Water Content Sewage Sludge |
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