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Mar Pollut Bull. 2016 Jun 15;107(1):188-205. doi: 10.1016/j.marpolbul.2016.04.001. Epub 2016 Apr 30.

Numerical evaluation of the use of granulated coal ash to reduce an oxygen-deficient water mass.

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FUKKEN Co. Ltd., 2-10-11 Hikarimachi, Higashi-ku, Hiroshima-shi, Hiroshima 732-0052, Japan. Electronic address:
Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima-shi 739-8528, Japan.
FUKKEN Co. Ltd., 2-10-11 Hikarimachi, Higashi-ku, Hiroshima-shi, Hiroshima 732-0052, Japan.
Research Center for Inland Seas, Kobe University, 5-1-1 Fukaeminami, Higashinada-ku, Kobe-shi 658-0022, Japan.


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.


Coastal marine sediments; Granulated coal ash (GCA); New GCA-based environmental restoration technique; Oxygen-deficient water mass; Pelagic–benthic coupled ecosystem model

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