잉여슬러지의 열적가용화를 통한 가용화 및 혐기성소화 생분해도 향상

다국어 초록 (Multilingual Abstract)

The present study investigated the effects of thermal pre-treatment on the enhancement of anaerobic biodegradability of waste activated sludge at varied TS concentration levels. The activated sludges were thermally oxidized for 30 minutes at 80{sim}200?C with varied TS concentrations (2%, 4% and 6%). and then, sludge characteristics, solubilization efficiency and methane production yield of thermally pre-treated sludges were analyzed. The higher the temperature in the thermal pre-treatment, the higher the concentration levels of dissolved matters such as SCOD_{Cr}, NH₄{^+} and VFAs, which indicates that the thermal pre-treatment facilitates the hydrolysis and acid fermentation. Furthermore, the solubilization efficiency was increased in proportion to the temperature rise at all TS concentrations and was reached at 68.9%, 55.6% and 53.1%, respectively, at 200?C. In the BMP test of the pre-treated sludges, higher methane production yields were observed as 0.313. 0.314 and 0.299m³;CH₄/kg;VS_{add} at the condition of TS 2% (160?C), 4% (160?C) and 6% (180?C), 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-treatment of waste activated sludge for anaerobic biodegradable process.

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