Electroosmotically Enhanced Sludge Pressure Filtration
Wastewater sludge is routinely dewatered to lower the cost of transportation and disposal. Dewatering is achieved via vacuum filtration, centrifugation, sand beds, and belt filter presses. Electroosmosis, the movement of water in the influence of a direct-current (dc) electric field, has been used since the 1930s to dewater soil for construction purposes. This study examines dewatering anaerobically and aerobically digested municipal wastewater solids with applied direct pressure and constant voltage direct current. A pressure filtration apparatus, consisting of a piston and drain plate made of conductive material encased in a body of nonconductive material, was used to apply constant pressure and constant voltage (variable current) during the experiments. Three experimental series were conducted evaluating the effect of polymer dosage and voltage on the final cake total solids; the relationship among pressure, voltage, time, and final cake total solids; and the relationship among initial feed solids and final cake total solids after electroosmotic filtration. Results show that final cake solids were increased to as much as 50% with 60 V dc applied. Final cake solids may be enhanced by increasing pressure, voltage, or time, and additional water may be removed from a conventionally dewatered cake by further application of dc voltage.
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Document Type: Research Article
Publication date: 1999-05-01
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Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year. Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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