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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 
Author: Dugan, Gordon L; Fujioka, Roger S; Lau, L Stephen; Takei, Gerald H; Gee, Henry K; McParland, Terra L; Chu, Holly M
Date: 1995-01
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.
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.
Series/Report No.: WRRC Project Reports
95-07
Sponsorship: Board of Water Supply City and County of Honolulu Grant/Contract No. C09012
Pages/Duration: viii + 95 pages
URI: http://hdl.handle.net/10125/2923
Keywords: water treatment, carbon filters, organic pesticides, contamination, well water, atomic absorption spectrophotometry, mass spectroscopy, granular activated carbon, minicolumn carbon analysis, EDB, DBCP, TCP, Mililani wells, Mililani water treatment plant, central Oahu, Hawaii, gas chromatography
LC Subject Headings: Carbon, Activated.
Mililani (Hawaii)
Water -- Purification -- Adsorption -- Hawaii -- Oahu.
Water quality management -- Hawaii -- Oahu.

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