The algal blooms in stagnant streams and lakes have caused many problems. Excessive algae leads to disturbance of ecosystem and overload of water treatment processes. Therefore, phosphorus(P), source of algal blooms, should be controlled. In this study, a filtration trench has been developed to convert dissolved phosphorus into hydroxyapatite(HAP) so that it could be crystallized on the surface of ‘phosphorus removal granular material’; and residual particulate phosphorus could be removed by additional precipitation and filtration. The front and rear parts of filtration trench consisted of ‘phosphorus removal granular material contact bed’ and ‘limestone filtration bed’, respectively. As a result of the column test using phosphorus removal granular material and limestone serially, PO4-P was removed more than 90% when EBCT(empty bed contact time) of the contact bed was over 20 minutes; and T-P represented 60% of removal efficiency when total EBCT was over 1.5 hours. The results of column tests to figure out the sedimentation characteristics showed that more than 90% of particulate phosphorus could be removed within 24 hours. It was necessary to optimize the filtration part in order to increase removal efficiency of T-P additionally. Also, it was confirmed through the simulation of Visual MINTEQ that most of particulate phosphorus in the column tests is the form of HAP. Based on the results of the study, it could be suggested that the design parameters are over 0.5 hour of EBCT for phosphorus removal granular material contact bed and over 1.5 hours of EBCT for limestone filtration bed.

ABSTRACT
 1. 서 론
 2. 기존 문헌 고찰
  2.1 결정여과 칼럼테스트 기존연구 고찰
 3. 연구방법
  3.1 여과수로 기본 개념 도출
  3.2 여과수로 설계인자 도출을 위한 칼럼테스트
  3.3 용존성 인 및 입자성 인의 거동 파악을 위한 화학평형 프로그램(Visual MINTEQ) 모의
 4. 결과 및 고찰
  4.1 인 제거 입상소재와 석회석자갈을 조합한 칼럼테스트 결과
  4.2 입자성 인의 침강특성 파악을 위한 칼럼테스트 결과
  4.3 인의 거동 파악을 위한 화학평형 프로그램(VisualMINTEQ) 모의 결과
 5. 결 론
 References

• 장여주(과학기술연합대학원대학교 스마트도시·건설융합) | Yeoju Jang (University of Science and Technology (UST), Smart City & Construction Engineering)
• 임현만(한국건설기술연구원 국토보전연구본부) | Hyunman Lim (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment)
• 정진홍(한국건설기술연구원 국토보전연구본부) | Jinhong Jung (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment)
• 안광호(한국건설기술연구원 국토보전연구본부) | Kwangho Ahn (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment)
• 장향연(과학기술연합대학원대학교 스마트도시·건설융합) | Hyangyoun Chang (University of Science and Technology (UST), Smart City & Construction Engineering)
• 박나리(과학기술연합대학원대학교 스마트도시·건설융합) | Nari Park (University of Science and Technology (UST), Smart City & Construction Engineering)
• 김원재(한국건설기술연구원 국토보전연구본부) | Weonjae Kim (University of Science and Technology (UST), Smart City & Construction Engineering) Corresponding author