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WRRCPR No.95-07 Extending the Effective Life of the GAC Used to Treat Well Water: Phase II of Evaluative Study at Mililani

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Title:WRRCPR No.95-07 Extending the Effective Life of the GAC Used to Treat Well Water: Phase II of Evaluative Study at Mililani
Authors:Dugan, Gordon L.
Fujioka, Roger S.
Lau, L. Stephen
Takei, Gerald H.
Gee, Henry K.
show 2 moreMcParland, Terra L.
Chu, Holly M.
show less
Keywords:water treatment
carbon filters
organic pesticides
well water
show 12 moreatomic absorption spectrophotometry
mass spectroscopy
granular activated carbon
minicolumn carbon analysis
Mililani wells
Mililani water treatment plant
central Oahu
gas chromatography
show less
LC Subject Headings:Carbon, Activated.
Mililani (Hawaii)
Water -- Purification -- Adsorption -- Hawaii -- Oahu.
Water quality management -- Hawaii -- Oahu.
Date Issued:Jan 1995
Publisher:Water Resources Research Center, University of Hawaii at Manoa
Citation:Dugan GL, Fujioka RS, Lau LS, Takei GH, Gee HK, McParland TL, Chu HM. 1995. Extending the effective life of the GAC used to treat well water: Phase II of evaluative study at Mililani. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC project report, 95-07.
Series:WRRC Project Reports
Abstract:Phase II is a continuation of the Phase I study to explore means of extending the effective life of the granular activated carbon (GAC) used in three central Oahu plants established by the Honolulu Board of Water Supply for the removal of volatile organic compounds: TCP, DBCP, and EDB. The Phase II
study only concentrated on the Mililani GAC treatment plant, which did not have a measurable concentration of EDB. Isotherms were developed for TCP, which were approximately two orders of magnitude higher than DBCP in Mililani well water, but the results were questionable due to relatively light TCP losses by volatilization. Fourteen laboratory dynamic filtration tests (minicolumn tests) were conducted, eight using a bituminous-based GAC (used in BWS' full-scale treatment plants) and six using lignite-based GAC. The lignite-based GAC significantly outperformed the bituminous-based GAC, requiring 24% less carbon to remove a unit amount of TCP. Aeration treatment effectively removed TCP and DBCP, but neither aeration nor GAC treatment appeared to appreciably remove natural background organic compounds.
Pages/Duration:viii + 95 pages
Appears in Collections: WRRC Project Reports

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