This study investigated microbial communities and their diversity in a full-scale mesophilic anaerobic digester treating sewage sludge. Influent sewage sludge and anaerobic digester samples collected from a wastewater treatment plant in Busan were analyzed using high-throughput sequencing. It was found that the microbial community structure and diversity in the anaerobic digester could be affected by inoculation effect with influent sewage sludge. Nevertheless, distinct microbial communities were identified as the dominant microbial communities in the anaerobic digester. Twelve genera were identified as abundant bacterial communities, which included several groups of syntrophic bacteria communities, such as Candidatus Cloacimonas, Cloacimonadaceae W5, Smithella, which are (potential) syntrophic-propionate-oxidizing bacteria and Mesotoga and Thermovigra, which are (potential) syntrophic-acetate-oxidizing bacteria. Lentimicrobium, the most abundant genus in the anaerobic digester, may contribute to the decomposition of carbohydrates and the production of volatile fatty acids during the anaerobic digestion of sewage sludge. Of the methanogens identified, Methanollinea, Candidatus Methanofastidiosum, Methanospirillum, and Methanoculleus were the dominant hydrogenotrophic methanogens, and Methanosaeta was the dominant aceticlastic methanogens. The findings may be used as a reference for developing microbial indicators to evaluate the process stability and process efficiency of the anaerobic digestion of sewage sludge.

Abstract
1. 서 론
2. 재료 및 방법
3. 결과 및 고찰
    3.1. High-throughput sequencing 결과
    3.2. 하수슬러지 및 혐기성 소화조 미생물 다양성 분석
    3.3. 하수슬러지 및 혐기성 소화조 미생물 군집 구조 분석
4. 결 론
감사의 글
REFERENCES

• 김민재(부경대학교 지구환경시스템과학부) | Minjae Kim (Division of Earth Environmental System Science (Major of Environmental Engineering))
• 박수인(부산대학교 사회환경시스템공학과) | Suin Park (Department of Social Environmental Systems Engineering, Pusan National University)
• 이주윤(부경대학교 지구환경시스템과학부) | Juyun Lee (Division of Earth Environmental System Science (Major of Environmental Engineering))
• 이혜빈(부산대학교 사회환경시스템공학과) | Hyebin Lee (Department of Social Environmental Systems Engineering, Pusan National University)
• 강선민(부경대학교 지구환경시스템과학부) | Seonmin Kang (Division of Earth Environmental System Science (Major of Environmental Engineering))
• 배효관(울산과학기술원 도시환경공학과) | Hyokwan Bae (Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology)
• 이준엽(부경대학교 지구환경시스템과학부(환경공학전공)) | Joonyeob Lee (Division of Earth Environmental System Science (Major of Environmental Engineering)) Corresponding author