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Hawaii Water Quality Extension Program
nps 319 | oahu watersheds | salt lake | project 02-202
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Natural Resources Extension

Project Name: Phytoremediation for Eutrophication
ASO Log No.: 02-202
Start/End Date: August 2002 to December 2004
Federal Funds: $97,055.00
Matching Funds: $109,149.00
Contractor: City and County of Honolulu
Department of Environmental Services
650 South King Street, 3rd Floor
Honolulu, HI 96813
Ph: (808) 527-6104
Fax: (808) 527-6214
Gerald Takayesu, Branch Head
Recent water quality monitoring of Salt Lake on Oahu, Hawaii indicates that the periphery drainage ditch and parts of the internal waterways are eutrophic because of high levels of phosphorous, Chlorophyll a, and turbidity. Source of eutrophic pollutants are from Aliamanu Military Reservation, Salt Lake residential areas, and the Honolulu Country Club golf course. Stormwater runoff also introduces a large amount of silt and debris into the lake, which accumulates as sediments, encouraging algae blooms and other vegetation to take root. Plants and animals feeding on these nutrients die and decompose and add to the accumulation on the lake bottom. Fish kills are common as are the release of Hydrogen Sulfide gases.
Objectives/Goals: To provide a sustainable approach to improve water quality in Salt Lake to the levels of EPA standards for clear water. The purpose of this project is to improve the water quality of Keehi Lagoon through the installation of floating phytoremediation platforms (FPP) systems in Salt Lake. The FPP will remove nutrients and pollutants, reducing algae growth and siltation, helping to control the foul odors surrounding the waterway. Educational workshops will also be produced.
Methods Employed: • Demonstrating floating phytoremediation platform system.
• Removing inorganic/organic pollutant, reducing algae growth, siltation, suspended solid and turbidity, and increasing water clarity.
• Conducting educational workshops on benefits of phytoremediation
Pollutants of Concern: Phosphorous, Chlorophyll a, and turbidity
Watershed: • Halawa, Moanalua, Keehi, and Salt Lake Watersheds, island of Oahu
Size of Project: 1,265 acre drainage basin, 10,000 sq. ft. waterway
Affected Water Bodies: Salt Lake, Keehi Lagoon, Moanalua Stream
Deliverables: • Video of project produced with students
• Four educational workshops
• Scientific paper
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Cooperative Extension Service programs, conducted in cooperation with the U. S. Department of Agriculture, are provided to the people of Hawaii without regard to race, sex, age, religion, color, national origin, ancestry, disability, marital status, arrest and court record, sexual orientation, or veteran status. The University is an equal opportunity / affirmative action institution.