Blast furnace slags as sorbents of phosphate from water solutions

Kostura, Bruno; Kulveitová, Hana; Leško, Juraj

doi:10.1016/j.watres.2005.03.010

Cited by 182 publications

(101 citation statements)

References 11 publications

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“…Due to their low cost, interesting chemical properties and high availability, different types of slag materials have been tested for their P retention characteristics. Kostura et al (2005), for example, studied crystalline and amorphous steel slag samples with low metal oxide content ground to different sizes. The authors found that particle size and surface area were related to the material's active CaO content, which in turn directly affected the pH of the equilibrium solutions.…”

Section: Materials That Exhibit P Adsorption On Metal Oxidesmentioning

confidence: 99%

Potential and limitations of phosphate retention media in water protection: A process-based review of laboratory and field-scale tests

Klimeski¹,

Chardon²,

Туртола³

et al. 2012

AFSci

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The application of phosphorus (P)-sorbing materials offers a possible solution for treating municipal wastewater and agricultural runoff. In this paper we discuss P retention and release mechanisms, and review studies on the P retention of different materials and their use as reactive media in filter beds. The main mechanisms for P retention are sorption on metal (mostly Fe or Al) hydroxide surfaces and, in alkaline conditions, the formation of Ca-P precipitates. The retention of P is strongly affected by the chemical composition of a material, its particle size and pH-related effects on sorption and precipitation both during testing and in practical operation. Laboratory tests are sensitive to solution chemistry (pH, alkalinity, ionic strength and composition, P concentration) and affected by material-to-solution ratio, contact time and agitation. Moreover, due to deviations from realistic field conditions, laboratory tests may produce imprecise estimates of the retention capacity and retention kinetics. In particular, materials that contain soluble substances (e.g., CaO) that elevate the pH of the ambient solution to high levels may in batch tests suggest a high capacity for P retention, but will most probably show much lower retention in field settings. On the other hand, materials containing metal oxides also retain P via slow reactions, and their retention capacity may be underestimated in short equilibrations. Appropriate laboratory test procedures will depend on their intended applications and material properties. Long-term field-scale tests are few in number, but some of them have shown promising results. Field-scale tests have, however, highlighted the design of the filters as a critical factor in their efficiency.

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Section: Materials That Exhibit P Adsorption On Metal Oxidesmentioning

confidence: 99%

Potential and limitations of phosphate retention media in water protection: A process-based review of laboratory and field-scale tests

Klimeski¹,

Chardon²,

Туртола³

et al. 2012

AFSci

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“…These researchers investigated a number of different filter materials (both natural and man-made materials) available in Sweden, with regard to their capacities to remove P from a variety of wastewaters. Among these materials, blast furnace slag (BFS) has attracted attention by several researchers, not only in Sweden but also elsewhere in the world [11][12][13][14][15][16][17].…”

Section: Open Accessmentioning

confidence: 99%

The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review

Westholm

2010

Water

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Abstract:Research on Phosphorus (P) removal capacity by blast furnace slags (BFS) has been undertaken in Sweden for the last decade. Both laboratory experiments and field trials have been carried out. While laboratory investigations revealed that BFS has a high P-sorption capacity (95-100%), P removal in field trials was much lower, ranging from 40 to 53%. In addition, a number of problems have been observed in BFS field testing including clogging, sulfuric odor and environmental (regulatory) concerns about possible leaching of heavy metals from the slag. In spite of these problems, and questioning by the environmental regulatory authorities, research continues to provide evidence that BFS can be regarded as a suitable filter media, and attempts have also been undertaken in order to further improve the P-removal capacity of this adsorbing material.

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“…More recently some researchers studied the feasibility of phosphate adsorption from phosphate-rich streams. The various adsorbents used include industrial materials and byproducts (i.e., iron oxide tailings [5], fly ash [6], blast furnace slag [7] and red mud [8]), natural or synthetic minerals (i.e., goethite [9,10], dolomite [11] and alunite [12]), metal oxide/hydroxide (i.e., aluminum oxide, iron oxide, zirconium oxide [13] and zirconium hydroxide [14]) and other materials (i.e., ion exchange resin [15]). …”

Section: Introductionmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

208

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a b s t r a c tA series of layered double hydroxides (LDHs) with different metal cations were synthesized to remove phosphate in waste sludge filtrate from a municipal wastewater treatment plant for phosphorus recovery and to help control eutrophication. The highest phosphate adsorption capacity was obtained by using Zn-Al-2-300, that is LDHs with Zn/Al molar ratio of 2 and calcined at 300 • C for 4 h. Circumneutral and mildly alkaline waters appeared suitable for the possible application of Zn-Al LDHs due to the amphoteric nature of aluminum hydroxide. Phosphate adsorption from the sludge filtrate by the LDHs followed pseudo-second-order kinetics, and the adsorption capacity at equilibrium was determined to be ∼50 mg P/g. Adsorption isotherms showed that phosphate uptake in this study was an endothermic process and had a good fit with a Langmuir-type model. The absorbed phosphate can be effectively desorbed (more than 80%) from LDHs particles by a 5 wt% NaOH solution. The regeneration rate of used LDHs was ∼60% after six cycles of adsorption-desorption-regeneration.

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Blast furnace slags as sorbents of phosphate from water solutions

Cited by 182 publications

References 11 publications

Potential and limitations of phosphate retention media in water protection: A process-based review of laboratory and field-scale tests

Potential and limitations of phosphate retention media in water protection: A process-based review of laboratory and field-scale tests

The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

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