연구논문 : 전기장 및 초음파에 의한 반송슬러지의 가용화에 따른 활성슬러지에서의 슬러지 감량화

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 SCODCr / TCODCr 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 SCODCr / TCODCr ratios, TSS in the reactor was correspondingly increased from 129 to 219 mg/L and TCODCr was also from 257 to 335 mg/L. However, TSS in the effluent was nevertheless kept lower at below 30 mg/L and TCODCr was also unvaryingly below 40 mg/L. For SCODCr / TCODCr = 0.3, the amount of excess sludge produced was at the highest decreased up to as high as 78%.