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KMID : 1024520080170070817
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Journal of the Environmental Sciences
2008 Volume.17 No. 7 p.817 ~ p.826
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A Study on the Disinfection of Coliform Group in the Effluent of Sewage Plant by High Voltage Electric Field Treatment
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Lee Min-Gyu
Chung Geun-Sik
Kam Sang-Kyu
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Abstract
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Using high voltage electric fields induced by high voltage AC (10-12 kV/cm, 20 kHz) and pulsed (20-30 kV/cm, 40 Hz) electric field generator as a semipermanent and environment-friendly disinfecting apparatus, the disinfection effect of coliform group in the effluent of sewage plant was investigated. The effects of electric field strength, treatment time, discharge area of a discharge tube, water quality factors (electric conductivity, pH and SS) on its death rate were examined. The death rate of coliform group was increased with increasing electric field strength and treatment time. For AC and pulsed electric field generator, the critical electric field strength was 6 kV/cm and 2 kV/cm, respectively, and the critical treatment time was 5 min and 2 min, respectively, regardless of electric field strength. Comparing the death rate of coliform group by AC and pulsed electric fields used in this study, its death rate was higher for the latter than the former, but did not increase linearly with increasing electric field strength. The results obtained for the effects of discharge area, electric conductivity, pH and SS on the death rate of coliform group using AC electric field (12 kV/cm, 20 kHz) were as follows: its death rate showed the trend to increase linearly with increasing discharge area; for the effect of electric conductivity, its death rate was increased with increasing electric conductivity, regardless of ionic species, increased with increasing cationic valency, but was similar between the same cationic valency; the pH used in this study did not affect its death rate; its death rate was decreased with increasing SS concentration.
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KEYWORD
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Disinfection, Coliform group, High voltage electric field treatment, Effluent of sewage plant
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