An innovative approach for sequential extraction of phosphorus in sediments: Ferrous iron P as an independent P fraction

Gu, Sen; Qian, Yiguang; Yang, Jin‐Hui; Li, Qingman; Pinay, Gilles; Gruau, Gérard

doi:10.1016/j.watres.2016.07.058

Cited by 46 publications

(13 citation statements)

References 44 publications

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“…The residue was rinsed twice with deionised (DI) water and dried for one week at room temperature (25 °C). Washing the slag with HCl aimed to remove the residual phosphorus attached to calcium [33], as this could improve the adsorption capacity of the copper smelter slag.…”

Section: Adsorbent Characterizationmentioning

confidence: 99%

Phosphorus and sulphates removal from wastewater using copper smelter slag washed with acid

Letshwenyo

Mokokwe

2021

SN Appl. Sci.

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In this study, we present the performance of acid washed copper smelter slag for the adsorption of phosphates and sulphates from wastewater. The aim of the study was to investigate the removal of phosphates and sulphates from wastewater using acid washed copper smelter slag at batch scale by exploring influences of different variables. The leachate concentrations of copper, iron, manganese and lead released from the adsorbent were 1.8, 128.2, 0.32 and 0.20 mg L−1, respectively at pH 2. The point of zero charge was at pH 6.04, Pseudo-Second Order kinetic model described the adsorption process better with an R2 value of 0.99. The experimental maximum adsorption capacities for phosphates and sulphates were 0.51 and 0.24 mg g−1 media, respectively, and 0.96 mg P g−1 media at pH 12 and 0.39 mg g−1 media for sulphates at pH 2, respectively. The process was endothermic with temperature having insignificant impact during adsorption. The maximum adsorption capacities for thermodynamic study were 0.103 ± 0.09 and 0.046 ± 0.004 mg g−1 media respectively, for PO43− P and SO42− at 60 °C. This study showed that acid washed copper smelter slag has an improved adsorption capacity for phosphate and sulphate ions but further investigations should be conducted to find ways of further improving the adsorbent performance. Article highlights There is increase in the adsorption capacity of acid washed copper smelter slag. The adsorption capacity of phosphorus is high at pH 12 and for sulphate at pH 6. The adsorption of phosphate and sulphate ions onto acid washed slag is an endothermic process. Intraparticle diffusion was not the only rate controlling mechanisms.

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Section: Adsorbent Characterizationmentioning

confidence: 99%

Phosphorus and sulphates removal from wastewater using copper smelter slag washed with acid

Letshwenyo

Mokokwe

2021

SN Appl. Sci.

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“…26 edge spectroscopic and microanalytical techniques (as applied, e.g., by Jilbert and Slomp;Dijkstra et al, 2014;Egger et al, 2015;Li et al, 2015) and modified, more selective sequential extraction schemes (Gu et al, 2016).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Phosphorus dynamics around the sulphate-methane transition in continental margin sediments: Authigenic apatite and Fe(II) phosphates

et al. 2018

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The formation of authigenic phosphate minerals in marine sediments is an important process for the burial and long-term storage of the bio-essential nutrient phosphorus (P). In this context, we report the composition of pore waters, bulk sediments, and the speciation of P in four sediment cores recovered on the continental margins off the Amazon, Rio de la Plata and Zambezi rivers. Here, pronounced sulphate-methane transitions (SMTs) occur between 4.5 and 6.5 m sediment depth where sulphate is consumed by the anaerobic oxidation of methane and free hydrogen sulphide builds up in the pore waters. This leads to the reductive dissolution of primary Fe (oxyhydr)oxides (FeOx) by hydrogen sulphide, and the subsequent liberation of FeOx-adsorbed phosphate into pore waters at the SMT. The released phosphate

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“…Such adsorbed phosphorus species are likely to be less difficult to remove compared to "micropore bound and mesopore bound" phosphorus [78,92]. In soil science and geochemistry, differences in the ease of phosphorus removal (due to its different binding phases and the resultant solubility properties) have been proposed as sequential extraction schemes [93], and have been widely employed [93][94][95][96][97][98][99][100][101] to classify or make speciation of the phosphorus contents of soils and target materials as total phosphorus (TP), loosely adsorbed or exchangeable phosphorus (LSP), iron-bound phosphorus (Fe-P), authigenic carbonate fluorapatite + biogenic apatite + CaCO 3 -associated P (Ca-P), detrital apatite phosphorus + other inorganic phosphorus, and organic phosphorus, [93,99,101,102]. The application of such sequential extraction schemes, which hinges on the distinct reactivity of each targeted phase to a particular extractant solution [103] or a similar scheme to phosphorus in high-phosphorus iron ores, can be of some benefit.…”

Section: Phosphorus In Iron Ores and Theories On Its Existence In Iromentioning

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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An innovative approach for sequential extraction of phosphorus in sediments: Ferrous iron P as an independent P fraction

Cited by 46 publications

References 44 publications

Phosphorus and sulphates removal from wastewater using copper smelter slag washed with acid

Phosphorus and sulphates removal from wastewater using copper smelter slag washed with acid

Phosphorus dynamics around the sulphate-methane transition in continental margin sediments: Authigenic apatite and Fe(II) phosphates

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

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