논문 상세보기
pp.768-775
This study was conducted to investigate the feasibility of nutrient recovery and reuse from centrate, which was produced by the centrifugal dewatering of anaerobic digested sludge. A continuous stirred reactor was operated for 3 months to recover phosphorous and nitrogen as magnesium ammonium phosphate (MAP) crystals from the centrate. More than 95% of phosphate could be recovered from the centrate into the crystalline materials. The contents of TP and TN in the crystalline materials were 28.1% and 5.17%, respectively. Some heavy metals were identified, but remained under Korean standards for organic fertilizer. On the other hand, X ray diffraction analysis clearly showed that the crystalline materials was MAP crystals. However, chemical analyses suggested that some undesirable crystals like magnesium potassium phosphate or hydroxyapatite might be formed during the MAP crystallization. Nevertheless, both results strongly confirmed that the MAP crystals could be a useful and valuable nutrient fertilizer, which slowly and continuously releases essential nutrients in response to the demand from farming and planting.
I. 서 론
II. 실험 장치 및 방법
1. 인 회수시설의 운전조건
2. 물리·화학적 분석
III. 결과 및 고찰
1. 인과 질소의 회수능력
2. 인 결정체의 형성과 성장
3. 인 결정체의 화학적 조성
4. 인 결정체의 구조
IV. 결 론
사 사
References
