Water quality improvement processes for stagnant area consist mainly of technologies applying vegetation and artificial water circulation, and these existing technologies have some limits to handle pollution loads effectively. To improve the purification efficiency, eco-friendly technologies should be developed that can reinforce self-purification functions. In this study, a multi-functional floating island combined with physical · chemical · biological functions (① flotation and oxidization using microbubbles, ② vegetation purification and ③ bio-filtration with improved adsorption capacity) has been developed and basic experiments were performed to determine the optimal combination conditions for each unit process. It has been shown that it is desirable to operate the microbubble unit process under conditions greater than 3.5 kgf/cm2. In vegetation purification unit process, Yellow Iris (Iris pseudacorus) was suggested to be suitable considering water quality, landscape improvement and maintenance. When granular red-mud was applied to the bio-filtration unit process, it was found that T-P removal efficiency was good and its value was also stable for various linear velocity conditions. The appropriate thickness of filter media was suggested between 30 and 45 cm. In this study, the optimal design and operating parameters of the multi-functional floating island have been presented based on the results of the basic experiments of each unit process.

ABSTRACT
 1. 서 론
 2. 재료 및 실험방법
  2.1 융복합부도 개요
  2.2 마이크로버블 단위공정의 기초실험 방법
  2.3 식생정화 단위공정의 기초실험 방법
  2.4 생물여과 단위공정의 기초실험 방법
 3. 결과 및 고찰
  3.1 마이크로버블 단위공정의 설계·운전인자
  3.2 식생정화 단위공정의 설계·운전인자
  3.3 생물여과 단위공정의 설계·운전인자
  3.4 다기능 융복합부도의 설계·운전인자
  3.5 다기능 융복합부도 테스트베드의 장기·연속운전결과
 4. 결 론
 References

• 임현만(한국건설기술연구원 국토보전연구본부) | Hyun-Man Lim (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research)
• 장여주(과학기술연합대학원대학교 스마트도시·건설융합) | Yeo-Ju Jang (University of Science and Technology (UST), Smart City & Construction Engineering)
• 정진홍(한국건설기술연구원 국토보전연구본부) | Jin-Hong Jung (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research)
• 윤영한(한국건설기술연구원 국토보전연구본부) | Young-Han Yoon (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research)
• 박재로(한국건설기술연구원 국토보전연구본부) | Jae-Roh Park (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research)
• 김원재(한국건설기술연구원 국토보전연구본부) | Weon-Jae Kim (Korea Institute of Civil Engineering and Building Technology (KICT), Department of Land, Water and Environment Research) Corresponding author