Temperature impact assessment on struvite solubility product: A thermodynamic modeling approach

Hanhoun, Mary; Montastruc, Ludovic; Azzaro‐Pantel, Catherine; Biscans, Béatrice; Frèche, M.; Pibouleau, Luc

doi:10.1016/j.cej.2010.12.001

Cited by 103 publications

(51 citation statements)

References 31 publications

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“…Phosphate removal can also be achieved by biological processes. However, physicochemical methods of phosphate removal studied by several authors remain the most effective and reliable (Montastruc 2003;Barbara and Jaroslaw 2005;Youcef and Achour 2005;Battistoni et al 2006;Lupa et al 2008;Cordell et al 2009;Del Nero et al 2010;Hanhoun et al 2011;Shintaro and Keisuke 2012;Said Metahri 2012).…”

Section: Introductionmentioning

confidence: 99%

An optimized pathway for phosphate ions removal from aqueous solution based on experimental design methodology

Zran

Yao

Trokourey

et al. 2014

Int. J. Environ. Sci. Technol.

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Wastewaters can contain residual phosphorus concentrations above the recommended limiting values, and it could have a high environmental impact. The discharge of such effluents is undesirable and can cause excessive nutrients and eutrophication in the receiving water. In order to produce an effluent suitable for stream discharge, chemical precipitation of phosphate based on a sequential experimental design has been explored. The influence of factors [pH, type of salt (calcium or iron)] involved in the co-precipitation of phosphate ions was studied by a complete factorial design. It was established that the optimal parameter values obtained from a secondorder model allowed conclusion to be drawn on the effectiveness of the removal. So in the best conditions (pH 8.41 and a dose of 97.07 mg/L Ca(OH) 2 with 10 mg/L FeSO 4 Á7H 2 O), 95.80 % (removal rate) of the phosphate ion were removed from the synthetic solution. A second-order mathematical model of the removal of phosphate ions, depending on two parameters which are pH and Ca(OH) 2 concentration, was finally proposed. Moreover, on the basis on the pH solution, it was shown that the precipitate formed was hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 and the scanning electron microscopy views revealed the amorphous and homogeneous aspect of the precipitates.

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Section: Introductionmentioning

confidence: 99%

An optimized pathway for phosphate ions removal from aqueous solution based on experimental design methodology

Zran

Yao

Trokourey

et al. 2014

Int. J. Environ. Sci. Technol.

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“…Its colour is described as greyish or grey/brown [5]. As a general rule, the hydrogen and di-hydrogen phosphates are slightly more soluble than the corresponding phosphates [6]. The low solubility product of newberyte 1,5 10 -6 at 25°C (Taylor, 1963), compared to the K sp of gypsum, 10 -4.58 allows to suppose that the mechanism explains the current localization of phosphate and magnesium in the near-surface region [7].…”

Section: The Case Studiesmentioning

confidence: 99%

Experiences at the Academy of Fine Arts of Brera in Milan, Italy: the application of laser-technology on three case studies of the historical heritage

Isella¹,

Bonelli²,

Cerea³

et al. 2017

Proceedings of the International Conference LACONA XI

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Scientific research regarding the conservation of gypsum plaster heritage is quite scarce; cleaning is often a problematic issue on this kind of material due to its water sensitivity and mechanical features. Therefore, laser cleaning is often a good option as some recent paper has reported. The research presented here focused on laser cleaning on three gypsum plaster casts belonging to the collection of Brera Fine Arts Academy and dated back to the 19th century; recalling the names of the original marble statues, the items are the Flora Farnese, The Velletri Pallas and the Barberini Faun. The three casts had been exposed for many decades in the entrance hall of the Academy in a semi-confined environment. Unfortunately, the continuous passage of students soiled the plaster surface with a grey greasy layer localized especially on the lower parts and on the surfaces with a strong horizontal component. It was possible to identify a superficial grime and traces of the original patina. Marks of different nature (felt, pen, pencil, scratches) were also present. Cleaning tests were carried out using Thunder Art Nd:YAG able to emit both at 1064 nm and at 532 nm. The effects of laser cleaning were studied with a diagnostic campaign carried out both before and after the cleaning operation. To define the aspects and the nature of the surface microsamples were sampled and analysed with XRD, XRF, then observed with a scanning electron microscope SEM, and with optical microscopy. Several tests were carried out on the Flora Farnese, calibrating the fluence in order to match the ablation threshold avoiding any damage (from FL=1 -1,45 J/cm² at 1064 nm to FL = 0,5 -0,7 J/cm² at 532 nm with repetition rate from 6 Hz to 10 Hz) in particular on these surfaces the removal of cement splashes constituted a hard task. A comparison in between tests at 1064 nm and at 532 nm were performed. Both tests were evaluated with the aid of humidification with free water (applied with brush) and with the use of AgarArt® rigid gel. On the basis of laser-plaster interaction observed on the Flora, the tests on the other casts excluded the IR radiation, because of a yellowing effect. For what regards the cast of the Pallas, one of the low relieves in the wooden support base was involved. The laser cleaning allowed the perfect removal of the outer layers of scialbo. For the cast of the Faun, laser cleaning proved to be the appropriate system to eliminate greasy deposits and dark grey stains visible on the irregular surface, maintaining the original morphology. Hence it was possible to avoid invasive mechanical and chemical systems, minimizing the interaction with the matter and saving working time. The aim of this work is to provide a contribution to the scientific 230 Elisa Isella et al.the emission of short impulses in Q-switch to avoid the excessive heating of the surface usually associated with long pulse duration. Furthermore, based on the research of basic laser interaction mechanisms, recent bibliographic references [2,3] have suggested to...

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“…There are different studies on the solubility constants for calcium and magnesium phosphates (Moreno, Gregory, and Brown 1968;Hanhoun et al 2011). The complexity of the apatite structure in general, and its penchant for substitutions, vacancies and impurities lead to inconsistent results on a specific apatite's solubility.…”

Section: Magnesium Ammonium Phosphate (Struvite) Formationmentioning

confidence: 99%

Biomimetic hydroxyapatite as a new consolidating agent for archaeological bone

North

2016

Studies in Conservation

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Temperature impact assessment on struvite solubility product: A thermodynamic modeling approach

Cited by 103 publications

References 31 publications

An optimized pathway for phosphate ions removal from aqueous solution based on experimental design methodology

An optimized pathway for phosphate ions removal from aqueous solution based on experimental design methodology

Experiences at the Academy of Fine Arts of Brera in Milan, Italy: the application of laser-technology on three case studies of the historical heritage

Biomimetic hydroxyapatite as a new consolidating agent for archaeological bone

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