Remediation of muddy tidal flat sediments using hot air-dried crushed oyster shells

Yamamoto, Tamiji; Kondo, Shunsuke; Kim, Kyunghoi; Asaoka, Satoshi; Yamamoto, Hironori; Tokuoka, Makoto; Hibino, Tadashi

doi:10.1016/j.marpolbul.2012.08.002

Cited by 24 publications

(11 citation statements)

References 9 publications

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“…8) More recently, we also clarified the mechanisms of hydrogen sulfide reduction by steelmaking slag in laboratory experiments. [11][12][13] To date, other industrial by-products such as granulated coal ash 14,15) and oyster shells 16,17) have also been applied to remediate sediment quality. However, a number of local harbors and inlets suffer from the odor of hydrogen sulfide gas.…”

Section: 2)mentioning

confidence: 99%

Reduction Test of Hydrogen Sulfide in Silty Sediment of Fukuyama Inner Harbor Using Steelmaking Slag

Miyata¹,

Hayashi²,

Kuwayama³

et al. 2015

ISIJ Int.

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Fukuyama inner harbor is an inlet located in the city area of Fukuyama, Hiroshima, Japan, where the offensive odor of the hydrogen sulfide released from organically enriched, anoxic sediments has become a social issue. Since hydrogen sulfide is also highly toxic and reactive with oxygen, its presence may cause further oxygen depletion in the bottom waters and ultimately, the total decay of local aquatic ecosystems. To evaluate its effects on dissolved sulfide formed in the sediments, steelmaking slag was applied in two different experimental treatments, capping the sediments and mixing with the sediments. The results revealed that both uses of the steelmaking slag significantly suppressed hydrogen sulfide gas by reducing the dissolved sulfide in the sediment interstitial water. This was clearly much more effective than the results obtained by capping with natural stones that was conducted as a control method. The examination with a SEM-EDX suggested that iron sulfide may form on the slag surface after immersing in the sulfidecontaining Fukuyama harbor sediments. It was concluded that applying steelmaking slag would be an effective method to suppress the annoying odor of hydrogen sulfide gas generated from the sediments of coastal areas due to its chemical reaction with sulfide ions.

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Section: 2)mentioning

confidence: 99%

Reduction Test of Hydrogen Sulfide in Silty Sediment of Fukuyama Inner Harbor Using Steelmaking Slag

Miyata¹,

Hayashi²,

Kuwayama³

et al. 2015

ISIJ Int.

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“…Most of the values fell within the range of total P concentrations reported in previous studies for various aquatic samples, including sediments from coastal shallow basins, eelgrass beds, tidal flats and estuaries, and suspended particulate matter. [35][36][37][38][39] We found low total P concentrations, Table 2. Sequential extraction steps and P phase identified in marine sediments.…”

Section: Total P Concentrationmentioning

confidence: 71%

Fractionation of Phosphorus in Steelmaking Slags and Aquatic Particulate Materials Using a Sequential Extraction Technique

2015

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We measured the concentrations and chemical forms of phosphorus (P), an essential nutrient in marine ecosystems, in steelmaking slag (Slag) to determine whether use of Slags as a basal medium for artificial tidal flats and seagrass beds was an environmentally acceptable option for the reuse and recycling of Slags. We tested six Slag samples, including dephosphorization slags and converter slags. The total P concentrations were one order of magnitude higher in the Slags than in the aquatic particulate materials. We used a sequential extraction technique in which the strength of the extractants was increased stepwise in order to separate the P pools in the Slags into four fractions; exchangeable P, Fe (III)-bound P, authigenic P-like component, and detrital P-like component. We considered P contained in the first two fractions to be easily mobilized under the conditions found in some marine environments, such as the highly reduced zones of subsurface sediments. The mobile P accounted for 55-660 μmol P g -1 and for 56-81% of the total P in the Slags. The results strongly suggested that Slags have substantial potential to function as a P source that could sustain biological productivity in artificial tidal flat and seagrass bed ecosystems. On the other hand, Slags also have the potential to mitigate intense and rapid release of P from basal media, because mechanisms exist for adsorption and co-precipitation of phosphate with major components of Slags, including iron, calcium, and magnesium.

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“…Addition of calcium nitrate reduced sulfide content over the entire layer and strongly reducing conditions were improved. Yamamoto (2012) reported that crushed oyster shells contribute to oxidization of marine sediments, and acid volatile sulfide was reduced by addition of this powder [13].…”

Section: Analysesmentioning

confidence: 99%

Remediation of Coastal Sediments by Addition of Calcium Nitrate and Presence of Benthos in a Muddy Tidal Flat

Harada

Akagi²,

Tutioka³

et al. 2014

JEP

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This study investigated the change in denitrification rate in muddy tidal flats sediment by chemical and biological remediation. Column experiments were conducted to determine the dependence of denitrification rate on the redox potential. Filtered seawater was fed continuously to the pipe filled with sediment from the muddy tidal flats. An increase in the redox potential from −198 mV to 21 mV with bioturbation led to increases in the denitrification rate from 24.2 mg/m 2 /day to 29.8 mg/m 2 /day. The increase in denitrification was explained by the acceleration of mass transfer in the sediment. Redox-potential increased from −400 mV to −200 mV by the addition of 10 g calcium nitrate, acid volatile sulfide was below the detection limit to 20 cm depth, and denitrification rate was increased from 21.3 mg/m 2 /day to 36.4 mg/m 2 /day. It is considered that the increased nitrogen concentration led to an increase in microbial activity.

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Remediation of muddy tidal flat sediments using hot air-dried crushed oyster shells

Cited by 24 publications

References 9 publications

Reduction Test of Hydrogen Sulfide in Silty Sediment of Fukuyama Inner Harbor Using Steelmaking Slag

Reduction Test of Hydrogen Sulfide in Silty Sediment of Fukuyama Inner Harbor Using Steelmaking Slag

Fractionation of Phosphorus in Steelmaking Slags and Aquatic Particulate Materials Using a Sequential Extraction Technique

Remediation of Coastal Sediments by Addition of Calcium Nitrate and Presence of Benthos in a Muddy Tidal Flat

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