Evaluation of blast furnace slag as basal media for eelgrass bed

Hizon-Fradejas, Amelia B.; Nakano, Yoichi; Nakai, Satoshi; Nishijima, Wataru; Okada, Minoru

doi:10.1016/j.jhazmat.2008.12.037

Cited by 19 publications

(11 citation statements)

References 37 publications

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“…Differences in the ACS and GS data could be attributed to differences between their properties. ACS was coarse and dense while GS was finer (Hizon-Fradejas et al, 2009). Generally, data in Fig.…”

Section: Addition Of Dredged Sediment Unto Slag Substratesmentioning

confidence: 84%

“…1). Moreover, among the slag substrates tested, shoots in GS pots gave the highest resistance against uprooting among the same <1.18 mm particle size samples, possibly because among the slag types used it is the most unconsolidated and closest to natural sand in terms of soil texture having fine, granulated structure (The Japan Iron and Steel Federation, 2006;Hizon-Fradejas et al, 2009). Since eelgrass is a natural entity, they are expected to prefer substrates similar to their natural habitat.…”

Section: Resistance To Uprootingmentioning

confidence: 99%

“…This suggests that aside from particle size effects, some other factors might be operating and preventing eelgrass to achieve its optimum root establishment; for instance, problems related to geochemistry of slag. In the initial evaluation of slag as eelgrass substrate, it was found that slag substrates release possible toxins like sulfide and Zn (Hizon-Fradejas et al, 2009).…”

Section: Resistance To Uprootingmentioning

confidence: 99%

“…In our initial study when slag substrates were compared with sediments from various eelgrass beds, it was found that the particle sizes of the slag substrates were within the acceptable range for growing eelgrass (Hizon-Fradejas et al, 2009). But then, the particle size of slag that will be optimum for eelgrass root establishment and growth was not investigated.…”

Section: Introductionmentioning

confidence: 99%

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Anchorage and resistance to uprooting forces of eelgrass (Zostera marina L.) shoots planted in slag substrates

Hizon-Fradejas

Nakano

Nakai

et al. 2009

J. of Wat. & Envir. Tech.

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Different types of slag (air-cooled, granulated and carbonated granulated slag) were employed as basal media of eelgrass, Zostera marina L. We investigated how factors such as slag type, particle size and sedimentation of fine particles affected anchorage of eelgrass to the substrates. It was found that eelgrass planted in slag substrates could endure current velocity of 10 to 50 cm s -1 . Thus, slag substrates can adequately support and anchor the eelgrass plants even during severe current flow (50 cm s -1 ). Root establishment and anchorage were also examined by looking at the resistance of the plants to uprooting forces. Results showed that shoots in slag substrates with the finest particle size (<1.18 mm) gave the highest resistance to uprooting among the particle sizes tested (<1.18, 1.18-2.36 and 2.36-4.75mm). Among the slag substrates, shoots in granulated slag pots gave the highest resistance to uprooting. Addition of dredged sediment (DS) or settling of fine particles improved the root establishment, anchorage of eelgrass and root-rhizome extension. However, it was suggested that addition of DS or settling of fine particles to slag may be beneficial to root establishment up to a certain extent only and too much of it might be harmful to eelgrass plants.

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Section: Addition Of Dredged Sediment Unto Slag Substratesmentioning

confidence: 84%

Section: Resistance To Uprootingmentioning

confidence: 99%

Section: Resistance To Uprootingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anchorage and resistance to uprooting forces of eelgrass (Zostera marina L.) shoots planted in slag substrates

Hizon-Fradejas

Nakano

Nakai

et al. 2009

J. of Wat. & Envir. Tech.

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“…Therefore, restoration projects and studies for the recovery of sea grass beds and tidal flats have been conducted all over the world. [4][5][6] In Japan, dredged sea sands were used conventionally to restore deteriorated sea grass beds and tidal flats. However, the dredging process has been blamed for environmental destruction of dredged areas.…”

Section: Introductionmentioning

confidence: 99%

Determination Method for Maximum Calcium Releasing Potential from Steel Slags, Marine Sands Alternatives in Seawater

et al. 2013

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Sea grass beds and tidal flats are facing imminent dangers of extinction. Steel slags are one of the promising alternative materials for marine sands to restore sea grass beds and tidal flats. On the other hand, significant pH increase and solidification attributed to dissolving calcium released from the slags are sometimes negative impact on ecosystems. To quantify the dissolved calcium, Japan Cement Association Standard method is conventionally used. However, our study leveled the method underestimate the dissolved calcium from the steel slags. The purpose of this study is to optimize the determination method for maximum calcium releasing potential from steel slags. Powdered sample (0.1 g) was stirred in 40 mL of 99.5% ethyleneglycol-100 mM tris buffer solution for 6 h at 80±5°C. Thereafter, the solution filter through 0.45 μm filter and the dissolved calcium was determined by ICP-AES. The optimized condition proposed in this study recovered the dissolved calcium from the slag in seawater perfectly.

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