Characteristics of Organic Matter Mixed with Steelmaking Slag for Accelerating Iron Elution in Seaweed Bed Restoration

Yamamoto, Makoto; Minami, Katsuya; Liu, Dan

doi:10.1252/kakoronbunshu.43.245

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…To address this problem, industries related to steel have applied ISS mixed with compost containing humic substances as iron supply materials for the sea. A successful example is that seaweed growth was improved by applying ISS mixed with compost containing humic substances [ 17 ]. Although the barren ground was severe before the installation of the mixture of ISS, algae had grown in the area a few months after the mixture was applied [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Iron Elution from Iron and Steel Slag Using Bacterial Complex Identified from the Seawater

et al. 2021

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Iron and steel slag (ISS) is a byproduct of iron refining processes. The lack of iron in seawater can cause barren grounds where algae cannot grow. To improve the barren grounds of the sea, a supply of iron to the seawater is necessary. This study focused on bacteria interacting with ISS and promoting iron elution in seawater. Sulfitobacter sp. (TO1A) and Pseudomonas sp. (TO1B) were isolated from Tokyo Bay and Sagami Bay. The co-culture of both bacteria promoted more iron elution than individual cultures. After the incubation of both bacteria with ISS, quartz and vaterite appeared on the surface of the ISS. To maintain continuous iron elution from the ISS in the seawater, we also isolated Pseudoalteromonas sp. (TO7) that formed a yellow biofilm on the ISS. Iron was eluted by TO1A and TO1B, and biofilm was synthesized by TO7 continuously in the seawater. The present research is expected to contribute to the improvement of ISS usage as a material for the construction of seaweed forests.

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Section: Introductionmentioning

confidence: 99%

Iron Elution from Iron and Steel Slag Using Bacterial Complex Identified from the Seawater

et al. 2021

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“…Steelmaking slag has been utilized in ocean area as sea-grass beds due to its rich source of minerals such as iron oxide and silicon oxide [1][2][3][4][5][6][7][8][9][10][11], a usable material to prevent seawater contamination caused by sulfide contained in the bottom soil matter of the sea [12][13][14][15], and materials to increase soil strength by mixing with dredged soil or bottom materials of the sea [16,17]. However, a part of CaO in steelmaking slag exists as isolated free CaO and is decomposed into Ca 2+ and OHions in seawater.…”

Section: Introductionmentioning

confidence: 99%

Alkali Elution Behavior of Steelmaking Slag Packed in an Open Channel Vessel in Seawater

Matsuda

Uddin

Kato

et al. 2020

J. Sustain. Metall.

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The alkali elution behavior of steelmaking slag in seawater was kinetically investigated and simulated under continuous flow in an open channel vessel with packed bed of steelmaking slag. Two types of steelmaking slags, viz. decarburization slag and dephosphorization slag, were used in this study. The alkali elution rate of decarburization slag was larger than that of dephosphorization slag due to larger free CaO content. The pH value for dephosphorization slag was almost the same as the seawater pH value in 3-4 days, whereas that for decarburization slag was stabilized in 3 days although the pH value was slightly larger than that of seawater. The capacity coefficients of alkali elution for dephosphorization and decarburization slags decreased together in an exponential manner with time. Based on a regression equation on the mass transfer capacity coefficient change with time, the alkali elution behavior was simulated and the calculated results agreed well with experimental ones. The temporal pH change was predicted by changing slag surface area and seawater flow rate as a parameter. According to the simulation results for dephosphorization slag, the seawater pH value did not reach a high level in the ocean area.

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Characteristics of Organic Matter Mixed with Steelmaking Slag for Accelerating Iron Elution in Seaweed Bed Restoration

Cited by 2 publications

References 14 publications

Iron Elution from Iron and Steel Slag Using Bacterial Complex Identified from the Seawater

Iron Elution from Iron and Steel Slag Using Bacterial Complex Identified from the Seawater

Alkali Elution Behavior of Steelmaking Slag Packed in an Open Channel Vessel in Seawater

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