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Sludge Reduction in Activated Sludge Process by solubilizing Return Sludge using Electric Field/Ultrasonification  

Yoon, Soon-Uk (Department of Environmental Engineering, Inha University)
Ahn, Chang-Min (Department of Environmental Engineering, Inha University)
Kim, Chang-Gyun (Department of Environmental Engineering, Inha University)
Publication Information
Journal of Korean Society on Water Environment / v.29, no.3, 2013 , pp. 329-336 More about this Journal
Abstract
This study was conducted to reduce excess sludge generation by recycling of return sludge to the aeration tank after solubilization by electric field charger and ultrasonifier. The return sludge was purposely broken-up to the ratio of $SCOD_{Cr}/TCOD_{Cr}$ at 0.1, 0.2, and 0.3, which was tested along with control (i.e., untreated). Solubilized sludge was subsequently treated in a bench-scaled conventional activated sludge reactor. According to varying $SCOD_{Cr}/TCOD_{Cr}$ ratios, TSS in the reactor was correspondingly increased from 129 to 219 mg/L and $TCOD_{Cr}$ was also from 257 to 335 mg/L. However, TSS in the effluent was nevertheless kept lower at below 30 mg/L and $TCOD_{Cr}$ was also unvaryingly below 40 mg/L. For $SCOD_{Cr}/TCOD_{Cr}$ = 0.3, the amount of excess sludge produced was at the highest decreased up to as high as 78%.
Keywords
Activated sludge process; Electric field; Return sludge; Sludge solubilization; Ultrasound;
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Times Cited By KSCI : 2  (Citation Analysis)
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