Phosphate Removal from Aqueous Solutions Using Calcium Silicate Hydrate Prepared from Blast Furnace Slag

Kuwahara, Yasutaka; Yamashita, Hiromi

doi:10.2355/isijinternational.isijint-2017-123

Cited by 26 publications

(16 citation statements)

References 28 publications

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“…When initial concentrations are 38.0–47.5 mg P/L, this material can achieve a maximum adsorption capacity of 53.11 g P/kg. This adsorbent is particularly promising for wastewater and water since it exerts activity even when the phosphate concentration is low and has tolerance to a wide range of pH values [ 72 ]. However, Yasipourtehrani et al [ 73 ] reported that samples of blast-furnace slag involved in the process release various concentrations of the toxic metals Al, Cd, Co, and Hg into solutions, a factor that could severely limit the material’s application in treatment.…”

Section: Synthesized and Waste Materials And Their Modificationsmentioning

confidence: 99%

Reactive Materials in the Removal of Phosphorus Compounds from Wastewater—A Review

et al. 2020

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Modern technologies designed to treat wastewater containing phosphorus compounds are based on the processes of adsorption and precipitation. In addition, more environmentally friendly and cheaper materials are being sought to ensure greater conformity with overarching assumptions of green chemistry and sustainable development. Against that background, this paper offers a review and analysis of available information on the considered reactive materials that have the capacity to remove phosphorus from wastewater. These materials are categorised as natural (with a sub-division in line with the dominant sorption groups of Al/Fe or Ca/Mg), waste, or man-made. Notably, most studies on sorbents have been carried out in laboratory systems via experimentation under static conditions. Among the natural materials, opoka has the highest sorption capacity of 181.20 g P/kg, while red mud (in the waste material category) is most efficient at binding phosphorus with a level of 345.02 g P/kg. Finally, among the group of commercial materials, Rockfos® has the highest sorption capacity of 256.40 g P/kg. In addition, this paper recognises the effect of composition, pH, and physical properties on a reactive material’s capacity to absorb phosphorus, as well as the possibility for further potential use in the production of fertilisers.

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Section: Synthesized and Waste Materials And Their Modificationsmentioning

confidence: 99%

Reactive Materials in the Removal of Phosphorus Compounds from Wastewater—A Review

et al. 2020

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“…In terms of phosphate immobilization mechanism, almost same transformation process happened as for both C-S-H materials. Based on the analysis of XRD and FTIR results, and previous studies [12,18,24,37,40], the mechanisms of phosphate removal using C-S-H material are shown in Fig. 12.…”

Section: Phosphate Removalmentioning

confidence: 96%

“…There are also other reports indicating that C-S-H has good immobilization ability for phosphorus [17,21,22]. Many C-S-Hs are synthesized from the natural siliceous substances or solid wastes, such as natural shale [17], carbide residue [23], slag [24], biomass ash [25,26] etc., which could make full use of these natural minerals or wastes. However, there are few reports focusing on P removal and recovery using C-S-H synthetized from desilication liquid of coal fly ash.…”

Section: Introductionmentioning

confidence: 99%

Characterizations of calcium silicate hydrates derived from coal fly ash and their mechanisms for phosphate removal

Tian

Sasaki

2019

DWT

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Coal fly ash is an industrial waste generated from the thermal power plant and a large amount of it could be produced annually in the world, which can cause serious environmental problems. Reutilization of coal fly ash could be imperative to alleviate the environmental pressure. Thus, in the present study, coal fly ash was used as silicon source for the synthesis of calcium silicate hydrates (C-S-Hs) though the desilication process. Two kinds of C-S-Hs was synthetized at 100°C and room temperature respectively, with the fixed Ca/Si molar ratio of 1.2, and adopted as the adsorbents for phosphate. The properties of them were characterized using XRD, SEM, FTIR, TG-DTA as well as surface area and pore analysis. Compared to C-S-H synthesized from high temperature, the C-S-H obtained at room temperature possessed high purity and larger surface area. Therefore, synthesis by agitation at room temperature could be an alternative method to produce C-S-H materials from desilication liquid of coal fly ash, and this could save infrastructure cost and energy consumption. Both C-S-H materials have good ability to immobilize phosphate pollutant (higher than 100 mg•g-1). The specific mechanisms of phosphate removal using C-S-H include several steps: firstly, phosphate ion was immobilized by binding with Ca 2+ and forming aggregates, and the C-S-H structures were gradually corroded. Eventually, hydroxyapatite was formed after the C-S-H structure was totally destroyed.

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“…Besides its ability to bind to iron mineral surfaces, phosphate is able to bind to other mineral surfaces such as kaolinite [234], silicates [235][236][237][238][239], and clay minerals [240][241][242][243][244], which are often present in iron ores as associated gangue minerals.…”

Section: Factors Influencing Phosphate Adsorption To Mineral (Iron Oxmentioning

confidence: 99%

Technological Challenges of Phosphorus Removal in High-Phosphorus Ores: Sustainability Implications and Possibilities for Greener Ore Processing

Ofoegbu

2019

Sustainability

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With the present rates of iron ore consumption, currently unusable, high-phosphorus iron ore deposits are likely to be the iron ores of the future as higher-grade iron ore reserves are depleted. Consequently, the design and timely development of environmentally-benign processes for the simultaneous beneficiation of high-phosphorus iron ores and phosphorus recovery, currently a technological challenge, might soon become a sustainability challenge. To stimulate interest in this area, phosphorus adsorption and association in iron oxides/hydroxyoxides, and current efforts at its removal, have been reviewed. The important properties of the most relevant crystalline phosphate phases in iron ores are highlighted, and insights provided on plausible routes for the development of sustainable phosphorus recovery solutions from high-phosphorus iron ores. Leveraging literature information from geochemical investigations into phosphorus distribution, speciation, and mobility in various natural systems, key knowledge gaps that are vital for the development of sustainable phosphorus removal/recovery strategies and important factors (white spaces) not yet adequately taken into consideration in current phosphorus removal/recovery solutions are highlighted, and the need for their integration in the development of future phosphorus removal/recovery solutions, as well as their plausible impacts on phosphorus removal/recovery, are put into perspective.

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Phosphate Removal from Aqueous Solutions Using Calcium Silicate Hydrate Prepared from Blast Furnace Slag

Cited by 26 publications

References 28 publications

Reactive Materials in the Removal of Phosphorus Compounds from Wastewater—A Review

Reactive Materials in the Removal of Phosphorus Compounds from Wastewater—A Review

Characterizations of calcium silicate hydrates derived from coal fly ash and their mechanisms for phosphate removal

Technological Challenges of Phosphorus Removal in High-Phosphorus Ores: Sustainability Implications and Possibilities for Greener Ore Processing

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