잉여슬러지의 열적가용화를 통한 가용화 및 혐기성소화 생분해도 향상
Enhancement of Anaerobic Biodegradability and Solubilization by Thermal Pre-treatment of Waste Activated Sludge
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초록
The present study investigated the effects of thermal pre-treatment on the enhancement of anaerobic biodegradabilityof waste activated sludge at varied TS concentration levels. The activated sludges were thermally oxidized for 30 minutes at80~200℃ with varied TS concentrations (2%, 4% and 6%). and then, sludge characteristics, solubilization efficiency and methaneproduction yield of thermally pre-treated sludges were analyzed. The higher the temperature in the thermal pre-treatment, the higherthe concentration levels of dissolved matters such as SCODCr, NH4+ and VFAs, which indicates that the thermal pre-treatmentfacilitates the hydrolysis and acid fermentation. Furthermore, the solubilization efficiency was increased in proportion to thetemperature rise at all TS concentrations and was reached at 68.9%, 55.6% and 53.1%, respectively, at 200℃. In the BMPtest of the pre-treated sludges, higher methane production yields were observed as 0.313. 0.314 and 0.299 m3 CH4/kg VSaddat the condition of TS 2% (160℃), 4% (160℃) and 6% (180℃), respectively, and degradation rate was increased by 84%, 79%and 65% compared with non-pretreated waste activated sludge. These findings suggest the effectiveness of thermal pre-treatmentof waste activated sludge for anaerobic biodegradable process.
Abstract
The present study investigated the effects of thermal pre-treatment on the enhancement of anaerobic biodegradabilityof waste activated sludge at varied TS concentration levels. The activated sludges were thermally oxidized for 30 minutes at80~200℃ with varied TS concentrations (2%, 4% and 6%). and then, sludge characteristics, solubilization efficiency and methaneproduction yield of thermally pre-treated sludges were analyzed. The higher the temperature in the thermal pre-treatment, the higherthe concentration levels of dissolved matters such as SCODCr, NH4+ and VFAs, which indicates that the thermal pre-treatmentfacilitates the hydrolysis and acid fermentation. Furthermore, the solubilization efficiency was increased in proportion to thetemperature rise at all TS concentrations and was reached at 68.9%, 55.6% and 53.1%, respectively, at 200℃. In the BMPtest of the pre-treated sludges, higher methane production yields were observed as 0.313. 0.314 and 0.299 m3 CH4/kg VSaddat the condition of TS 2% (160℃), 4% (160℃) and 6% (180℃), respectively, and degradation rate was increased by 84%, 79%and 65% compared with non-pretreated waste activated sludge. These findings suggest the effectiveness of thermal pre-treatmentof waste activated sludge for anaerobic biodegradable process.
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