Physical and chemical characteristics of waste activated sludge treated with electric field |
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Authors: | Kai Chen Hengyi Lei Yuejuan Li Hualiang Li Xinghong Zhang Chuang Yao |
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Institution: | aSchool of Environmental Science and Engineering, Sun Yat-sen University, No. 135, Xingang West Road, Guangzhou 510275, PR China;bHenan Technical College of Construction, No.199, Zhongyuan Road, Zhengzhou 450007, PR China |
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Abstract: | This study investigates the physical and chemical characteristics of sludge treated with controlled levels of electric field. The results indicated that the potential gradient and contact time strongly influenced the physical and chemical characteristics of sludge. Based on the settling velocity measurements, a potential gradient of 6 V/cm with a treatment time of 10 min is recommended as an optimal condition for improving sludge settling. For sludge disintegration, applying a higher potential gradient and a longer treatment time to the sludge are more efficient than applying lower levels. The results of the experiments presented here show that an electric field not only disintegrates sludge and destroys microbial cells but also removes and solubilizes organic substances. Possible mechanisms of electric field treatment are also discussed. |
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Keywords: | Potential gradient Settleability Treatment time Physical&ndash chemical characteristics Waste activated sludge |
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