title: Numerical evaluation of the use of granulated coal ash to reduce an oxygen-deficient water mass.
abstract: Granulated coal ash (GCA), which is a by-product of coal thermal electric power stations, effectively decreases phosphate and hydrogen sulfide (H2S) concentrations in the pore water of coastal marine sediments. In this study, we developed a pelagic-benthic coupled ecosystem model to evaluate the effectiveness of GCA for diminishing the oxygen-deficient water mass formed in coastal bottom water of Hiroshima Bay in Japan. Numerical experiments revealed the application of GCA was effective for reducing the oxygen-deficient water masses, showing alleviation of the DO depletion in summer increased by 0.4-3mgl(-1). The effect of H2S adsorption onto the GCA lasted for 5.25years in the case in which GCA was mixed with the sediment in a volume ratio of 1:1. The application of this new GCA-based environmental restoration technique could also make a substantial contribution to form a recycling-oriented society.
authors.affiliation: FUKKEN Co. Ltd., 2-10-11 Hikarimachi, Higashi-ku, Hiroshima-shi, Hiroshima 732-0052, Japan. Electronic address: h-yamamoto@fukken.co.jp.
authors.forename: Hironori
authors.initials: H
authors.lastname: Yamamoto
authors.affiliation: Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima-shi 739-8528, Japan.
authors.forename: Tamiji
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: FUKKEN Co. Ltd., 2-10-11 Hikarimachi, Higashi-ku, Hiroshima-shi, Hiroshima 732-0052, Japan.
authors.forename: Yugo
authors.initials: Y
authors.lastname: Mito
authors.affiliation: Research Center for Inland Seas, Kobe University, 5-1-1 Fukaeminami, Higashinada-ku, Kobe-shi 658-0022, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Asaoka
mesh_terms: D000327:Adsorption; D003031:Coal; D060729:Coal Ash; D017753:Ecosystem; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005068:Eutrophication; D019015:Geologic Sediments; D006862:Hydrogen Sulfide / Q000032:analysis; D007564:Japan; D010100:Oxygen / Q000737:chemistry*; D010710:Phosphates; D014867:Water
chemical_list: D003031:Coal; D060729:Coal Ash; D010710:Phosphates; D014867:Water; D010100:Oxygen; D006862:Hydrogen Sulfide
keywords: Coastal marine sediments; Granulated coal ash (GCA); New GCA-based environmental restoration technique; Oxygen-deficient water mass; Pelagic–benthic coupled ecosystem model