Field experiments on remediation of coastal sediments using granulated coal ash

Kim, Kyunghoi; Hibino, Tadashi; Yamamoto, Tamiji; Hayakawa, Shinjiro; Mito, Yugo; Nakamoto, Kenji; Lee, In-Cheol

doi:10.1016/j.marpolbul.2014.04.008

Cited by 30 publications

(12 citation statements)

References 10 publications

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“…연안 저서환경 개선에 대한 연구는 꾸준히 진행되어 왔으 며, 자원재활용의 관점에서 산업폐기물을 이용하는 많은 연 구가 수행되어 왔다 (Li et al, 2017;Martins, 2017;Asaoka et al, 2012). 이와 관련하여 비산재에 시멘트를 첨가하여 조 립화 한 석탄회 조립물은 인산염의 용출 및 황화수소의 발생 을 효과적으로 억제하여 환원저질을 개선할 수 있는 것으로 보고되고 있다 (Kim et al, 2014…”

Section: 서 론unclassified

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A Study on Changes in Pore Water Quality of Polluted Sediment due to Mixing Ratio of Granulated Coal Ash

Lee¹,

Woo²,

Kim³

et al. 2018

J Korean Soc Coast Ocean Eng

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This study investigated the changes in pore water quality of polluted sediment by mixing ratio of granulated coal ash. The mesocosm experiments were carried out with 0%, 10%, 30% and 50%, respectively, of the material mixture ratio relative to the sediments. According to the results of the experiments, pH increased depending on the mixing ratio. Phosphate and ammonia concentrations were significantly decreased in the mixing ratio of 30% and 50% compared to the control (p < 0.05). The concentration of hydrogen sulfide was reduced by 72% at the mixing ratio of 10%, and it was not detected at the mixing ratio of 30% and 50%. This study was confirmed that granulated coal ash can change the pore water quality of polluted sediments in proportion to the amount of material. However, the effect of the mixing ratio between 30% and 50% was not significantly different, thus it is concluded that mixing of 30% of the volume of the sediment is economically feasible.

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Section: 서 론unclassified

“…석탄회 조립물 혼합비율에 따른 오염 퇴적물의 간극수 수질 변화에 관한 연구 205 의 증가에 따른 수층으로의 유출량 증가에 따른 결과로 판단 된다(Kim et al, 2014).황화수소의 결과는Fig. 6에 나타내었다.…”

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A Study on Changes in Pore Water Quality of Polluted Sediment due to Mixing Ratio of Granulated Coal Ash

Lee¹,

Woo²,

Kim³

et al. 2018

J Korean Soc Coast Ocean Eng

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“…(1) Based on the results obtained in this study, the application of the GCA to organically enriched sediments is effective in reducing hydrogen sulfide in sediment pore water for a long time. In our proposed method, the GCA is simply scattered or mixed with the organically enriched sediment accumulated in eutrophic areas such as enclosed water bodies, innermost areas of bay, lakes, and tidal rivers using a dredging boat to remove hydrogen sulfide [20][21][22]. Furthermore, laboratory and field trials in this 18 study showed that the applied GCA in actual field sites need not be collected because the adsorption site for hydrogen sulfide on the GCA could be regenerated during the vertical mixing seasons.…”

Section: Regeneration Mechanisms Of the Adsorption Site For Hydrogen mentioning

confidence: 99%

Regeneration of manganese oxide as adsorption sites for hydrogen sulfide on granulated coal ash

Asaoka

Okamura

Akita

et al. 2014

Chemical Engineering Journal

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It is important to remove hydrogen sulfide to maintain healthy ecosystems as well as viable aquaculture activities in enclosed water bodies. Granulated coal ash with high adsorption capacity for hydrogen sulfide is a by-product generated from coal combustion processes in coal-fired power plants. The purposes of this study were to (1) verify the regeneration of the adsorption sites for hydrogen sulfide on the granulated coal ash by redox reaction which changes between oxic and anoxic conditions and (2) prove the regeneration mechanisms of the adsorption site which leads to high adsorption capacity for hydrogen sulfide. XAFS analyses of the granulated coal ash revealed that the adsorption site for hydrogen sulfide on the granulated coal ash was regenerated at least 10 times through oxidation of manganese oxide under oxic conditions. A positive correlation (r=0.995) between the peak top energy of manganese XAFS in the GCA collected from field trial sites and the Eh of the sediments applied with the GCA was observed. These results proved that hydrogen sulfide was adsorbed and oxidized by the granulated coal ash during the stratified season. During the vertical mixing seasons, oxygen regenerates the adsorption site for hydrogen sulfide. It is concluded that this 3 regeneration of adsorption site gives the granulated coal ash high adsorption capacity for hydrogen sulfide.

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“…Recently, methods of using granulated coal ash (GCA, a by-product of coal thermal electric power stations), have received notable attention for improving sediment and water quality that have been impaired by high rates of organic matter decomposition [3][4]. Kim et al [3] reported that scattering GCA on the sea bottom sediment could reduce the release of nutrient salts and H2S from the sea bottom sediment.…”

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confidence: 99%

“…Kim et al [3] reported that scattering GCA on the sea bottom sediment could reduce the release of nutrient salts and H2S from the sea bottom sediment. Yamamoto et al [4] also confirmed that GCA could improve the benthic environment in the surface sediment.…”

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Solar Cell-Combined Sediment Microbial Fuel Cell for Preserving Sediment and Water Environments

Touch¹,

Yamaji²,

Takata³

et al. 2017

IJEP

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Abstract-Sediment microbial fuel cell (SMFC), an electrochemistry technology, is expected to be an alternative method for improving both water and sediment environments. This study presents the development of a solar cell-combined SMFC system (SC-SMFC), and the improvement of sediment and water environments by SC-SMFC through laboratory experiments. The distributions of pH and redox potential (ORP) in sediment were formed, in which larger decreases in pH and increases in ORP were found near the anode after the SC-SMFC application. From the pH and ORP distributions, the sediment located between 0 mm and 150 mm from the anode was strongly influenced by the SC-SMFC application, which was around 2-fold higher than that influenced by the application of SMFC alone. Interestingly, the system application caused the dissociation of calcium and iron complexes. This dissociation increased the concentrations of calcium and ferric ions, leading to the fixation of phosphate in the sediment. Furthermore, different decomposition characteristics of organic matter were found in the sediments near and far from the anode. In addition, the quality of overlying water was also improved by the system application. For example, the dissolved oxygen concentration remained higher near the sediment surface. These findings validate the usefulness of SC-SMFC as an alternative method for improving both sediment and water environments concurrently.

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Field experiments on remediation of coastal sediments using granulated coal ash

Cited by 30 publications

References 10 publications

A Study on Changes in Pore Water Quality of Polluted Sediment due to Mixing Ratio of Granulated Coal Ash

A Study on Changes in Pore Water Quality of Polluted Sediment due to Mixing Ratio of Granulated Coal Ash

Regeneration of manganese oxide as adsorption sites for hydrogen sulfide on granulated coal ash

Solar Cell-Combined Sediment Microbial Fuel Cell for Preserving Sediment and Water Environments

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