Improved Dewatering Technology of Steel Industry's Sludges by an Electrochemical System
Abstract:The amount of sludge produced by steel industry has been steadily increasing for last decades. It is becoming more difficult and costly to meet the discharge requirements using the conventional methods adopted by steel industry. The electrodewatering system consists of a hydraulic bench press-frame fitted with an electric field and data acquisition system. Using conventional pressure filtration sludge treatment methods at Pohang Iron & Steel Corporation (POSCO), resulting water content of Corex sludge, Stainless steel sludge, and Cold rolling mill sludge were 45 wt%, 85 wt%, and 85 wt%, respectively. On the other hand, the water content of above three different sludges was dramatically decreased to 25.0 wt%, 51.0 wt%, and 38.6 wt%, respectively. In addition, the electrodewatering method could reduce the cost of chemicals, since flocculant does is not needed in electrodewatering. The results of this study clearly demonstrated that the dewatering system could be highly applicable to steel industry's sludge treatment system.
Document Type: Research Article
Publication date: January 1, 2002
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