Positive Growth of Phytoplankton under Conditions Enriched with Steel-making Slag Solution.

Nakamura, Y.; Taniguchi, Atsushi; Okada, Shigeru; Tokuda, Masanori

doi:10.2355/isijinternational.38.390

Cited by 29 publications

(18 citation statements)

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“…Takayuki FUTATSUKA, Kiyoteru SHITOGIDEN, 1) Takahiro MIKI, 2) Tetsuya NAGASAKA 3) and Mitsutaka HINO 2) Formerly Graduate Student, Graduate School of Engineering, Tohoku University, now at JFE Steel Corp. 1) Formerly Graduate Student, Graduate School of Engineering, Tohoku University, now at Nippon Yakin Kogyo Corp. 2) Department of Metallurgy, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai 980-8579 Japan.…”

Section: Dissolution Behavior Of Nutrition Elements From Steelmaking mentioning

confidence: 99%

“…Seawater Nakamura et al 1) examined the propagation ability of 12 species of phytoplankton in seawater enriched with steel- Dissolution behavior of elements from 4CaO · P 2 O 5 (8.5 mass% P), 3CaO · P 2 O 5 (10.0 mass% P) and 2CaO · SiO 2 -3CaO · P 2 O 5 (2.8 mass% P) solid solution phase in artificial seawater was investigated to confirm that dissolution rate of phosphorus depends on the kind of crystal phase.…”

Section: Dissolution Experiments Of Steelmaking Slags Intomentioning

confidence: 99%

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Dissolution Behavior of Nutrition Elements from Steelmaking Slag into Seawater

et al. 2004

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Section: Dissolution Behavior Of Nutrition Elements From Steelmaking mentioning

confidence: 99%

Section: Dissolution Experiments Of Steelmaking Slags Intomentioning

confidence: 99%

Dissolution Behavior of Nutrition Elements from Steelmaking Slag into Seawater

et al. 2004

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“…It was actually demonstrated that a steelmaking slag positively stimulates the growth of phytoplankters when an increase in the pH due to CaO was neutralized. 9) In case of slag enrichment in field, such neutralization can not be applied. Therefore, we examined the effect of the slags in batch cultures under freely drifting pH.…”

Section: Introductionmentioning

confidence: 99%

Effects of Steelmaking Slag Addition on Growth of Marine Phytoplankton

2003

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Culture experiments of a natural phytoplankton assemblage collected from coastal surface water and a mono-specifically cultured diatom were conducted to investigate the possibility of steelmaking slags to use as a nutrient resource for marine phytoplankton. Two kinds of slags, a decarburization slag and a dephosphorous slag, were tested in batch cultures under freely drifting pH. Leaching experiment to determine dissolution of nutrient elements from the slags demonstrated that phosphate and reactive silicate are released into seawater, while rate of their dissolutions does not simply depend on amount of the slags. Excess addition of the slags (3 300 mg/l ) decreased phosphate in the seawater probably due to precipitation with calcium of main component of the slags. Growth of natural phytoplankton assemblage was evidently enhanced by addition of the slags at 33 mg/l. However, excess addition (3 300 mg/l ) suppressed the growth of phytoplankton due to not only decreased phosphate and silicate but also increased pH to 10. This shift to alkaline might decrease considerably solubility of iron (essential nutrient for phytoplankton growth), although organic ligands existed. These results indicate that slag enrichment would be effective at a lower dose to avoid pH increase. Although in our study 33 mg/l was confirmed to be the best dose, solubility of the elements and pH increase might be different with different slags. Therefore, the best dose should be determined for each slag before application.

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“…[7][8][9][10][11] On the other hand, there are several studies on the elution of environmentally-controlled fluorine into the seawater. [12][13][14] When steelmaking slag is being dropped into the seawater or when it has been piled on the sea bottom, the surrounding sea area might become cloudy due to Mg(OH) 2 generated by the reaction of Mg 2 + originally existed into the seawater and OH − dissolved from the steelmaking slag.…”

Section: Introductionmentioning

confidence: 99%

Alkali Elution Behavior of Steelmaking Slag into Seawater by Continuous Stirred Tank Reactor

et al. 2015

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In order to understand the alkali elution behavior of steelmaking slag under continuous flow, a kinetic study was carried out by continuous stirred tank reactor (CSTR). Tap water and seawater were used for measurements of circumferential velocity and temporal change in pH, respectively. Liquid was fed into the vessel and flowed constantly during the impeller rotation operation in the vessel. The effect of the various operating factors such as vessel inner diameter, slag size, slag composition, ratio of liquid volume to mass of slag, seawater feed rate, impeller height from the slag, impeller rotation speed etc. were investigated.The circumferential velocity in the vessel was not affected by seawater feed rate but by the impeller rotation speed. The alkali elution rate increased with the increase in the circumferential velocity. The alkali elution rate was not influenced by the ratio of liquid volume to mass of slag and impeller height from the slag surface. The alkali elution rate decreased with the decrease in diameter of slag particle below 0.01 m due to the insufficient penetration of seawater between slag particles. The alkali elution rate increased with the increase in seawater feed rate at the same circumferential velocity. The non-dimensional correlation equation of alkali elution rate was shown by Sh = 8.26 × 10 − 4 Re p 0.62 (Nτ) − 0.37 where Sh: Sherwood number, Re p : Particle Reynolds number and (Nτ): the product of impeller rotation speed and residence time.

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Positive Growth of Phytoplankton under Conditions Enriched with Steel-making Slag Solution.

Cited by 29 publications

References 0 publications

Dissolution Behavior of Nutrition Elements from Steelmaking Slag into Seawater

Dissolution Behavior of Nutrition Elements from Steelmaking Slag into Seawater

Effects of Steelmaking Slag Addition on Growth of Marine Phytoplankton

Alkali Elution Behavior of Steelmaking Slag into Seawater by Continuous Stirred Tank Reactor

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