Field experiments on remediation of coastal sediments using granulated coal ash.
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.
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan. Electronic address: kobilekr@hiroshima-u.ac.jp.
Kyunghoi
K
Kim
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan.
Tadashi
T
Hibino
Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan.
Tamiji
T
Yamamoto
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan.
Shinjiro
S
Hayakawa
Fukken Co., Ltd., Hiroshima 732-0052, Japan.
Yugo
Y
Mito
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan.
Kenji
K
Nakamoto
Department of Ocean Engineering, Pukyong National University, 45, Yongso-ro, Nam-Gu, Busan 608-737, Republic of Korea.
In-Cheol
IC
Lee
D044822:Biodiversity; D060729:Coal Ash / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry* / Q000302:isolation & purification; D052918:Environmental Restoration and Remediation; D006862:Hydrogen Sulfide / Q000737:chemistry* / Q000302:isolation & purification; D010710:Phosphates / Q000737:chemistry*; D056928:X-Ray Absorption Spectroscopy
D060729:Coal Ash; D004785:Environmental Pollutants; D010710:Phosphates; D006862:Hydrogen Sulfide
Coastal sediment; Granulated coal ash; Hydrogen sulfide; Phosphate; Remediation