| Title |
Sludge Reduction in Activated Sludge Process by Solubilizing Return Sludge using Electric Field/Ultrasonification |
| Authors |
윤순욱 ( Soou Uk Yoon ) ; 안창민 ( Chang Min Ahn ) ; 김창균 ( Chang Gyun Kim ) |
| Keywords |
Activated sludge process; Electric field; Return sludge; Sludge solubilization; Ultrasound |
| 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 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%. |