Batch cultivations were performed to evaluate the influences of the initial pH condition on mesophilic and thermophilic acidogenic fermentation with food waste recycling wastewater. In both conditions of mesophilic and thermophilic fermentation, TVFAs production rates were maximized at the initial pH 7 condition as 0.15 and 0.23 g TVFAs/L·hr, respectively. And pH was also maintained stably between 6 and 7 during 72hr acidogenic cultivation at both conditions. However, predominant VFA components were different according to reaction temperature conditions. In mesophilic condition, propionic acid which has low conversion efficiency to methane was accumulated up to 1,348 mg/L while acetic and butyric acid were predominant in thermophilic condition. Therefore, thermophilic acidogenic fermentation was superior for the effective VFAs production than mesophilic condition. From the DGGE analysis, the band patterns were different according to the initial pH conditions but the correlations of the each band were increased in similar pH conditions. These results mean that microbial communities were certainly affected by the initial pH condition. Consequently, the adjustment of the initial pH to neutral region and thermophilic operation are needed to enhance acidogenic fermentation of food waste recycling wastewater.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 음폐수의 성상
  2.2. 산발효 회분식 실험
  2.3. PCR-DGGE를 이용한 미생물 군집해석
 3. 결과 및 고찰
  3.1. 초기 pH와 온도조건에 따른 pH 변화
  3.2. 초기 pH와 온도조건에 따른 TVFAs 생성량 변화
  3.3. 초기 pH와 온도조건에 따른 VFA 성분별 조성
  3.4. 고온조건의 초기 pH에 따른 미생물 군집의 상관도
 4. 결 론
 참 고 문 헌

• 변임규(부산대학교 환경기술․산업개발연구소) | Im-Gyu Byun (Institute for Environmental Technology and Industry, Pusan National University) Corresponding author