Development of eco-engineering system using technique of reproduction and inhabitation of benthos on tideland and shallow sea area.

2001 Fiscal Year Final Research Report Summary

• Project/Area Number: 10650551
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Civil and environmental engineering
• Research Institution: National Institute for Environmental Studies
• Principal Investigator: INAMORI Yuuhei National Institute for Environmental Studies, Reserch Center for Material Cycles and Waste Management, Executive Resercher, 循環型社会形成推進・廃棄物研究センター, 室長 (10142093)
• Co-Investigator(Kenkyū-buntansha): MIZUOCHI Motoyuki National insutitute for Environmental Studies, Reserch Center for Material Cycles and Waste Manegement, Senior Resercher, 循環型社会形成推進, 廃棄物研究センター・主任研究員 (50260188) ; XU Kaiqiu National insutitute for Environmental Studies, Watershed Environments and Management Reserch Project, senior resercher, 流域圏環境管理研究プロジェクト, 主任研究員 (20250722) ; WATANABE Makoto National insutitute for Environmental Studies, Environmental Biology Division, Director, 生物圏環境研究領域, 領域長 (10132870)
• Project Period (FY): 1998 – 2001
• Keywords: Environmental ecology engineering / Environmental load / Benthos / Fixation / Water quality purification / Artificial Tideland / Eco-engineering

Research Abstract

Tideland bench-scale experimental model was established to evaluate the influence of heavy oil as an index of environmental pollution substance on the performance of mesocosm systems that consist of lugworms and short-neck clams and bacteria living in tideland.
As a result, compared with lugworms, a littleneck clam's susceptibility was higher to environmental load. It was found that water quality in the system declined due to the presence of the organic mater from the carcass, whereas, with the existing of lugworm, water quality decline was not so serious. It suggested that lugworm living in benthos, has the possibility of maintaiuing purification capability under existence of heavy oil. Moreover, it was thought that bacteria increased by heavy oil that can be treated as an organic matter, and the organic matter was further reduced by predation of lugworms after decomposition and purification by bacteria. The results investigated in KASAI artificial tideland and SANNBANNSE natural tideland showed that COD purification ability, the species of microorganisms and the amount of biomass in the area which the depth is less than 3-meter in SANNBANNSE natural tideland were higher than those in KASAI artificial tideland. The COD purification ability in the natural tideland is two-fold higher than that in the artificial one. It is clear that the proper structure is important for the tideland purification function from a biological, physical and chemical point of view. From the results conducted in preceding year, it also suggested that by devising reproduction/fixing technology of benthos purification function could be strengthened in the tideland system.