Inhibition of calcium phosphate precipitation under environmentally-relevant conditions

Cao, Xinde; Harris, Willie G.; Josan, Manohardeep S.; Nair, Vimala D.

doi:10.1016/j.scitotenv.2007.05.012

Cited by 82 publications

(44 citation statements)

References 23 publications

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“…At an initial solution pH of 6.5 and P concentration of 8 mg l -1 (0.26 mM; the lowest P concentration used by Zhu and Alva 1994) however, all of the added P remained in the aqueous phase (non-precipitated). Laboratory experiments by Cao et al (2007) induced Ca-P precipitation in prepared solutions at pH 7.1 with high Ca and P concentrations. The system reached the maturation stage of crystal growth (when solution concentrations of P and Ca change slowly, if at all) after some hours, at which point P and Ca concentrations had decreased to about 15 and 40 mg l -1 (0.5 and 1 mM), respectively.…”

Section: Discussionmentioning

confidence: 98%

The effects of gypsum on the transfer of phosphorus and other nutrients through clay soil monoliths

Uusitalo¹,

Ylivainio²,

Hyväluoma³

et al. 2012

AFSci

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We applied gypsum (CaSO 4 ×2 H 2 O) amendments to 100 m 2 plots within two clay-textured fields, one under shallow cultivation to 10 cm depth and the other ploughed to 20 cm depth. Unamended plots and plots subjected to a CaCO 3 (finely ground limestone) application served as controls. Separate soil monoliths (30 cm in diameter, 40 cm in depth) were collected for laboratory rainfall simulations from all plots 7, 19 and 31 months after the initial application of the amendments. Water passed through the monoliths during these simulations was analysed for turbidity, dissolved and particulate phosphorus (DRP and PP), nitrogen species, dissolved organic carbon (DOC), as well as dissolved Ca 2+ , Mg 2+, K + and S, pH, and electrical conductivity (EC). Over the three-year monitoring period, gypsum amended soils exhibited substantial decreases in turbidity (45%), PP (70%), DRP (50%) and DOC (35%) relative to control samples. The effects gradually decreased with time, and after 31 months gypsum effects on P species were detectible, but no longer statistically significant. We consider gypsum amendments as a potential tool for slowing P loss from agricultural areas with high P loss potential.

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Section: Discussionmentioning

confidence: 98%

The effects of gypsum on the transfer of phosphorus and other nutrients through clay soil monoliths

Uusitalo¹,

Ylivainio²,

Hyväluoma³

et al. 2012

AFSci

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“…Calcium phosphate seed was found to be more effective at reducing the calcium concentration, 20 g L -1 being sufficient to reduce the calcium concentration to below 10 mg L -1 . A seed dose of 20 g L -1 would, however, be expected to be prohibitively expensive when one considers that reuse of the seed may be difficult due to carbonate fouling of the seed surface [ 15]. It can be seen from Figure 4(a) that to achieve the same calcium levels would require more than ten times this dose of calcium carbonate.…”

Section: No Seedmentioning

confidence: 99%

“…Removal of scale precursor ions has also been achieved via unseeded precipitation of calcium carbonate by alkali addition [3]. It is known that unseeded precipitation is also sensitive to solution conditions [13,14,15]. As a consequence of the presence of these interfering constituents, ASP treatment of municipal wastewater using calcium carbonate as seed has been found to require large seed doses and extended precipitation periods [16].…”

mentioning

confidence: 99%

Enhancement of reverse osmosis water recovery using interstage calcium precipitation

Sartipy

Ostarcevic

Atherton³

et al. 2012

Desalination

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The feasibility of removing calcium scale precursor ions from reverse osmosis (RO) concentrate by accelerated seeded precipitation (ASP) was investigated with the goal of increasing product water recovery and minimizing the volume of concentrate disposal from inland municipal wastewater desalination plants. Three seed materials were tested in laboratory trials -calcium carbonate, calcium sulfate and calcium phosphate. Calcium carbonate and calcium sulfate seed were not effective. The addition of calcium phosphate seed particles at 20 g L-1 or phosphate ion in stoichiometric excess of the calcium concentration (250 mg L-1 Ca = 6.25 mM Ca2+, 650 mg L-1 HPO42-= 6.7 mM) decreased the calcium content in the RO concentrate to 10 mg L-1. Evaluation of the accelerated seeded precipitation process using in-situ generated calcium phosphate seed at the pilot scale was performed on a 25 kL day-1 pilot plant consisting of dissolved air flotation, ultrafiltration and reverse osmosis. The treated concentrate was filtered by a ceramic filtration system. Preliminary cost analyses indicates that high recovery RO using calcium phosphate precipitation can only be justified in inland situations where restrictions on concentrate disposal drive smaller evaporation pond storage volumes to offset the higher chemical and energy running costs.

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“…Consequently, the recovery of P from wastewater is highly essential for enhancing the quality of water environment and for recycling of mineral phosphorus resources. In recent years, studies focusing increasingly on combined processes, removing P from domestic wastewater and recovering it simultaneously in the form of a valuable product, such as struvite (MAP) or hydroxyl calcium phosphate (HAP), have been performed in lab-scale or full-scale reactors (Antonini et al 2012;Cao et al 2007;Cusick, Logan 2012;Daniels et al 2013;Hug, Udert 2012). Most of studies have mainly focused on the combination of biological nutrients removal (BNR) with chemical precipitation process.…”

Section: Introductionmentioning

confidence: 99%

A Novel Process for Nutrients Removal and Phosphorus Recovery From Domestic Wastewater by Combining BNR With Induced Crystallization

Lü

2014

Journal of Environmental Engineering and Landscape Management

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Abstract. Trinitrotoluene (TNT), a commonly used explosive for military and industrial applications, can cause serious environmental pollution. 28-day laboratory pot experiment was carried out applying bioaugmentation using laboratory selected bacterial strains as inoculum, biostimulation with molasses and cabbage leaf extract, and phytoremediation using rye and blue fenugreek to study the effect of these treatments on TNT removal and changes in soil microbial community responsible for contaminant degradation. Chemical analyses revealed significant decreases in TNT concentrations, including reduction of some of the TNT to its amino derivates during the 28-day tests. The combination of bioaugmentation-biostimulation approach coupled with rye cultivation had the most profound effect on TNT degradation. Although plants enhanced the total microbial community abundance, blue fenugreek cultivation did not significantly affect the TNT degradation rate. The results from molecular analyses suggested the survival and elevation of the introduced bacterial strains throughout the experiment. Keywords: TNT, bioaugmentation, biostimulation, phytoremediation, microbial community.

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Inhibition of calcium phosphate precipitation under environmentally-relevant conditions

Cited by 82 publications

References 23 publications

The effects of gypsum on the transfer of phosphorus and other nutrients through clay soil monoliths

The effects of gypsum on the transfer of phosphorus and other nutrients through clay soil monoliths

Enhancement of reverse osmosis water recovery using interstage calcium precipitation

A Novel Process for Nutrients Removal and Phosphorus Recovery From Domestic Wastewater by Combining BNR With Induced Crystallization

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