The objective of this study was to find optimum pretreatment conditions of ozone and microwave for solubilizationof thickened waste activated sludge (TWAS). Response surface analysis was applied to determine the combination of ozoneconcentration (0.03 to 0.1g O3/g total solid (TS)) and microwave temperature (100~170oC). The temperature significantlyaffected the solubilization degree of sludge (p<0.01). Within the design boundaries, the conditions predicted to maximizethe solubilization degree of 41.6% were determined to be 0.065g O3/g TS and 170oC. On the other hand, the solubilizationdegree with the ozone pretreatment alone was 2.7 to 12.2% at 0.03~0.1g O3/g TS. The results show that the combinationof ozone and microwave pretreatments is effective in solubilization of TWAS.

Abstract
 I. 서 론
 II. 실험방법
  1. 대상시료
  2. 오존 실험장치
  3. 마이크로웨이브 실험장치
  4. 분석방법
  5. 실험 설계
 III. 결과 및 토론
  1. 오존농도에 따른 가용화율
  2. 오존농도와 마이크로웨이브 조사온도에 따른 가용화율
 IV. 결 론
 사 사
 References

• 류우신(강원대학교 환경공학과) | Yu-Chen Liu
• 안종화(강원대학교 환경공학과) | Johng-Hwa Ahn Corresponding author