This study was initiated to isolate the microorganisms removing phosphorus (P) from domestic sewage and to investigate the effects of environmental factors on the growth and P removal of the isolated bacteria. Microorganisms isolated from the sewage were identified as Chryseobacterium sp., Stenotrophomonas maltophilia, and Bacillus licheniformis. Among them, Bacillus licheniformis was selected as the P removal microorganism. The environmental factors considered in this study included initial phosphorus concentration, temperature, pH, and carbon source. At initial P concentrations of 10, 20, and 30 mg/L, the P removal efficiencies were 100.0%, 84.0%, and 16.5%, respectively. At 20°C, 30°C, and 40°C, the P removal efficiencies were 0%, 75.8%, and 60.6%, respectively. The removal efficiencies of phosphorus according to pH were 1.6%, 91.7%, and 51.1% at pH 5, pH 7, and pH 9, respectively. Using glucose, acetate, and glucose + acetate as carbon sources yielded P removal efficiencies of 80.9%, 33.6%, and 54.1%, respectively. Therefore, the results from the study demonstrated that the P removal efficiencies of Bacillus licheniformis were the highest when the initial P concentration, temperature, pH, and carbon source were 10 mg/L, 30°C, 7, and glucose, respectively.

Abstract
1. 서 론
2. 재료 및 방법
    2.1. 순수 분리 및 배양
    2.2. 미생물 생장 및 인 농도의 측정
    2.3. PAOs 선별
    2.4. 환경인자 변화에 따른 Bacillus licheniformis의생장 및 인 제거 효과
    2.5. 통계분석
3. 결과 및 고찰
    3.1. 인제거 미생물 순수 분리
    3.2. 순수 분리된 미생물의 인 제거 효율
    3.3. Bacillus licheniformis의 인 제거 효과에 대한환경 요인 평가
4. 결 론
REFERENCES

• 한석순(충북대학교 환경생명화학과) | Seok-Soon Han (Department of Environmental and Biological Chemistry, Chungbuk National University)
• 박상욱(충북대학교 환경생명화학과) | Sang-Wook Park (Department of Environmental and Biological Chemistry, Chungbuk National University)
• 김덕원(충북대학교 환경생명화학과) | Deok-Won Kim (Department of Environmental and Biological Chemistry, Chungbuk National University)
• 박지수(두산전자 Field Quality Control 김천 part) | Ji-Su Park (Field Quality Control Gimcheon part, Doosan Corporation Electro-Materials)
• 오은지(한국환경정책평가연구원 자연환경연구실) | Eun-Ji Oh (Water and Land Research Group/Division for Natural Environment, Korea Environment Institute)
• 유진(인천광역시보건환경연구원 생활환경과) | Jin Yoo (Indoor Environment Division, Incheon Metropolitan City Institute of Public Health and Environment)
• 김덕현(국립환경과학원 토양지하수과) | Deok-Hyeon Kim (National Institute of Environmental Research)
• 정근욱(충북대학교 환경생명화학과) | Keun-Yook Chung (Department of Environmental and Biological Chemistry, Chungbuk National University) Corresponding author