The different phases in the precipitation of dicalcium phosphate dihydrate

Ferreira, António; Oliveira, Carolina; Rocha, Fernando

doi:10.1016/s0022-0248(03)00899-6

Cited by 101 publications

(98 citation statements)

References 15 publications

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“…Clear seasonal variations of TP removal observed for both types of wastewater, although not following the temperature fluctuations exactly suggested a dependence of temperature on TP retention, confirming the results reported by other authors [19,42,43], who recorded high P removal efficiency in summer and low value in winter. Within a certain scope, high temperature was beneficial to improve P retention capacity through favoring precipitation [44], which could partly explain the gradual increase of TP removal rate as the temperature rose since the period 2 and the negative removal during winter. Furthermore, temperature is also a crucial factor impacting biological processes including plant growth.…”

Section: The Role Of Vegetation Development On Tp Removal Performancementioning

confidence: 99%

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Chang

Zhang

et al. 2015

Desalination and Water Treatment

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A B S T R A C TFour small-scale gravel-based integrated vertical-flow constructed wetlands (IVCWs) were established to treat domestic and secondary wastewater (SW) in parallel under two loading rates (LRs) for an operational period of about two years and the total phosphorus (TP) removal performances were investigated and compared. Highly effective TP elimination sustained for about 10 d, with remarkable declines followed to relatively stable efficiencies for both types of wastewater. Significant difference of TP removal performance for the two types of wastewater was observed. In period 1, under high LR, the IVCWs performed better when treating domestic wastewater (DW), achieving average removal efficiency and rate of 51.6% and 0.389 g m, respectively, compared to those of 30.1% and 0.233 g mfor SW. However, in the operational period 2 fed with a low LR, better TP removal performance was achieved for SW, with reduction efficiency and rate of 41.5% and 0.057 g m −2 d −1 on average, while the corresponding value for the treatment of DW was just 12.5% and 0.023 g m. Significant correlations between TP removal efficiency and plant growth detected during this period and better developed vegetation in systems fed with SW might suggest the considerable role of plant growth, which could be influenced by inlet properties, on P retention and lifespan extending of constructed wetland. Gravel-based IVCW could be employed to remove low load of phosphorus and wastewater properties, and plant growth cycle should be taken into consideration in future IVCW design and application.

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Section: The Role Of Vegetation Development On Tp Removal Performancementioning

confidence: 99%

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Chang

Zhang

et al. 2015

Desalination and Water Treatment

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“…Other preparation techniques such as neutralization of H 3 PO 4 and/or MCPM solutions by CaO, CaCO 3 or more basic CaPO 4 (a-or b-TCP, CDHA, HA, TTCP) are also known. Interestingly, that precipitation of DCPD by mixing a Ca(OH) 2 suspension and a H 3 PO 4 solution in the equimolar quantities was found to occur in five stages, being HA the first precipitated phase (Ferreira et al 2003;Oliveira et al 2007). Besides, DCPD might be prepared in gels (Sivkumar et al 1997;Madhurambal et al 2009).…”

Section: Dcpdmentioning

confidence: 99%

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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“…Brushite is also considered to be a precursor or intermediate phase of HA during bone mineralization. However, in vitro by mixing a calcium hydroxide suspension and an orthophosphoric acid solution, the precipitation of brushite occurs after the initial precipitation of HA and through a very complex process [28]. b-TCP is a bioactive and biodegradable bone replacement material.…”

Section: Crystal Morphologiesmentioning

confidence: 99%

Effects of glutamic acid shelled PAMAM dendrimers on the crystallization of calcium phosphate in diffusion systems

et al. 2010

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Second generation poly(amidoamine) (PAMAM) dendrimers were synthesized and peripherally modified with glutamic acid (PAMAM-MG) as a shell. The effect of the dendrimers on the crystallization of different calcium phosphate compounds was investigated in both double and one way diffusion systems. It was found that the crystals of calcium phosphate showed tape-like morphology in the presence of PAMAM-MG, and the crystals' thickness and width decreased compared to those grown without dendritic molecules. Such a result might be due to the interaction of electric charges between dendritic molecules and octacalcium phosphate (Ca 8 H 2 (PO 4 ) 6 Á5H 2 O, OCP), which led to the adsorption of PAMAM-MG in the 100 and 010 surfaces of OCP. Moreover, PAMAM-MG showed an affinity for gelatin, and it could cause the formation of amorphous calcium phosphate (Ca 9 (PO 4 ) 6 ÁnH 2 O, ACP) at a concentration of 5 mg/mL of PAMAM-MG. These results suggest that PAMAM-MG could be used for regulating the morphology of OCP and changing the composition of minerals in gels.

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The different phases in the precipitation of dicalcium phosphate dihydrate

Cited by 101 publications

References 15 publications

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Effects of glutamic acid shelled PAMAM dendrimers on the crystallization of calcium phosphate in diffusion systems

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