Field experiments on remediation of coastal sediments using granulated coal ash |
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Authors: | Kyunghoi Kim Tadashi Hibino Tamiji Yamamoto Shinjiro Hayakawa Yugo Mito Kenji Nakamoto In-Cheol Lee |
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Institution: | 1. Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan;2. Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan;3. Fukken Co., Ltd., Hiroshima 732-0052, Japan;4. Department of Ocean Engineering, Pukyong National University, 45, Yongso-ro, Nam-Gu, Busan 608-737, Republic of Korea |
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Abstract: | Field experiments were carried out to evaluate the effect of Granulated Coal Ash (GCA) on remediation of coastal sediments in terms of removing phosphates and hydrogen sulfide. Phosphate concentrations in the sediment were kept below 0.2 mg/l after the application of GCA, whereas those in the control sites increased up to 1.0 mg/l. The concentration of hydrogen sulfide in the sediment was maintained at almost zero in the experimental sites (GCA application sites) for over one year, whereas it ranged 0.1–2.4 mg S L−1 in control sites. Meanwhile, individual number of benthos increased in the experimental sites by several orders of magnitude compared to the control sites. The major process involved in hydrogen sulfide removal by GCA was thought to be the increase in pH, which suppresses hydrogen sulfide formation. From our findings, we concluded that GCA is an effective material for remediating organically enriched coastal sediment. |
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Keywords: | Granulated coal ash Remediation Coastal sediment Hydrogen sulfide Phosphate |
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