This study aimed to investigate the feasibility of improving dewaterability and settleability of sewage sludge using coagulation sludge. When mixed with sewage sludge and coagulation sludge at 1:1 ratio, capillary suction time(CST) and specific resistance to filtration(SRF) decreased by about 56% and 68%, respectively. It is found that total solids(TS) and volatile solids(VS) of mixing sludge are increased by about 59% and 53%, respectively. Also, the turbidity of the mixing sludge supernatant was reduced from 99 to 16 NTU. It is observed that the mixing of sewage sludge and coagulation sludge at 1:1 showed better effect than using poly-aluminum chloride(PAC) coagulant at 25 mg/L.

ABSTRACT
 1. 서 론
 2. 재료 및 방법
  2.1 실험 방법
  2.2 분석 방법
 3. 결과 및 고찰
  3.1 하수슬러지와 응집슬러지의 특성 비교
  3.2 무기개량제 이용에 따른 하수슬러지의 응집 특성
  3.3 대체소재로서 응집슬러지 이용에 따른 하수슬러지의 응집 특성 변화
 4. 결 론
 사 사
 References

• 소수현(한국과학기술연구원 물자원순환연구단, Center for Water Resource Cycle, Korea Institute of Science and Technology) | Soo-Hyun So
• 이병하(KG 케미컬(주), KG Chemical Co. Ltd.) | Byung-Ha Lee
• 박준홍(연세대학교 사회환경시스템공학부, School of Civil and Environmental Engineering, Yonsei University) | Joon-Hong Park
• 차호영(자인엔텍(주), Zignentech Co. Ltd.) | Ho-Young Cha
• 김한수(서울시립대학교 환경공학부, School of Environmental Engineering, University of Seoul) | Han-Soo Kim
• 송경근(한국과학기술연구원 물자원순환연구단, Center for Water Resource Cycle, Korea Institute of Science and Technology) | Kyung-Guen Song Corresponding author