Crystallization of struvite from metastable region with different types of seed crystal

Ali, Imtiaj; Schneider, P.A.

doi:10.1515/jnetdy.2005.007

Cited by 21 publications

(10 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Waste recovered struvite has thus been shown to be an effective soil additive for several crops, with similar yields being reported when compared with traditional inorganic P fertiliser [triple-super-phosphate (TSP)] (Ahmed et al 2018, Li et al 2019. Although published data on the performance of waste recovered P fertilisers is increasing (Johnston and Richards 2003;Ali et al, 2005), the different chemical behaviours of struvite, particularly across differing soil types is less well understood (Symanska et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus speciation and fertiliser performance characteristics: A comparison of waste recovered struvites from global sources

et al. 2020

View full text Add to dashboard Cite

Our immediate and future food security agenda requires sustainable phosphorus (P) management, and recovered P products such a struvite form part of the solution. Waste recovered struvite is generated from different waste streams and precipitation technologies. In this study, we compare P speciation and bioavailability of nine struvite products with traditional/granulated chemical fertilisers to investigate performance characteristics across soil types in the Irish ecoregion.Elemental-analysis/P-speciation of the struvites was examined by ICP-OES, 31 P solid state NMR, PXRD and P-solubility tests. The fertiliser dose effect and bioavailability of the different struvite products were tested in 4-week and 3-month rhizotron experiments with Lolium perenne. In addition to calculating plant-P offtake, bioavailability was assessed by Olsen-P and Diffusive-Gradients-in-Thin-Films (DGT). The struvites differed markedly in colour/appearance, texture, metal content and solubility. Struvites all had similar P-speciation, but minor impurity phases were detected. There was no significant difference between the struvite samples and triple-superphosphate (TSP) with respect to either plant growth performance or P-bioavailability. The struvite products are produced from different wastewater streams/processes, yet possess a uniformity in overall fertilising performance within our experiments. Encouragingly, no appreciable agronomic difference in terms of yield was observed between the struvite and chemical fertilisers, which provides further evidence in support of struvite as a sustainable alternative to mined rockphosphate derived products. Importantly the struvite samples analysed within this study contained both significantly fewer impurities than TSP and lower concentrations of toxic metals such as cadmium.

show abstract

Section: Introductionmentioning

confidence: 99%

Phosphorus speciation and fertiliser performance characteristics: A comparison of waste recovered struvites from global sources

et al. 2020

View full text Add to dashboard Cite

show abstract

“…It is important to note that optimization of celestite impregnation on the sand surface through direct precipitation in terms of supersaturation level and kinetics of celestite precipitation could possibly yield much higher celestite loading on the sand surface. 64 However, the objective of this study was to demonstrate the proof of concept with follow-on work designed to optimize the impregnation protocol.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Development of Functionalized Proppant for the Control of NORM in Marcellus Shale Produced Water

Gusa

Vidic

2018

Environ. Sci. Technol.

View full text Add to dashboard Cite

One of the major environmental concerns with the recovery of unconventional gas resource from Marcellus Shale is the presence of naturally occurring radioactive material (NORM) in produced water. Ra-226 is the major component of NORM with a half-life of 1600 years that is present at concentrations as high as several thousand pCi/L. Most of the studies on NORM management are focused on above-ground scenarios. The main focus of this study was on functionalizing the proppant (i.e., quartz sand) that is used in hydraulic fracturing to prevent the closure of induced fractures formed during this process and allow release of natural gas so that it can also sequester NORM from the produced water before it reaches the surface. Five different sulfates and carbonates were tested for their ability to capture Ra-226 from aqueous solution and celestite (SrSO 4 ) was identified as the best choice because of its affinity for Ra-226 sequestration even in the presence of very high total dissolved solids that are characteristic of Marcellus Shale produced water. Among possible ways of coating the proppant with celestite, precipitating celestite directly on the sand surface was found to be the best option as it provided a uniform distribution of celestite and high uptake of Ra-226. Although quartz sand can adsorb some radium from the solution due to electrostatic interactions, adding a small amount of celestite on the sand surface (20−30 mg/g) increased radium removal from the solution containing 5000 pCi/ L of Ra-226 to more than 80% in dilute solution and to more than 50% in high-salinity solution even in the presence of very high concentrations of competing divalent cations. The results of this study indicate the potential of coated proppant to sequester NORM in the subsurface and prevent adverse environmental impacts when radiogenic produced water is brought to the surface.

show abstract

“…The time lag between the achievement of super saturation and the starting of the crystal nuclei is often termed the induction time [24]. The advantage of infinite induction time is the redissolving of induced crystals in solution due to high-energy consumption from a relatively low driving force [25]. Our experiment results showed that in the first 2 minutes of the precipitation tests, without seed, phosphorus recovery efficiency was 26.50%, while it had reached 33.25% in the seeded test (Fig.…”

Section: Discussionmentioning

confidence: 99%

Effects of Solution pH and Seed Material on MAP Crystallization

Tang¹

2016

IJEPP

View full text Add to dashboard Cite

Experimental results revealed that solution pH was one of the most important factor which effected not only phosphorus recovery percentage but also phosphorus recovery rate during the struvite forming process. Introduction of seed materials increased the phosphorus recovery percentage to an extent and optimum seed particle range and adding amount were 70-140 mesh and 0.5g (solution pH=8.5). The one-stage seed addition worked better than multi-stage addition and phosphorus recovery percentage rose with increasing initial seed dosing. Seed addition speeded the phosphorus recovery rate to some extent on the whole.

show abstract

Crystallization of struvite from metastable region with different types of seed crystal

Cited by 21 publications

References 15 publications

Phosphorus speciation and fertiliser performance characteristics: A comparison of waste recovered struvites from global sources

Phosphorus speciation and fertiliser performance characteristics: A comparison of waste recovered struvites from global sources

Development of Functionalized Proppant for the Control of NORM in Marcellus Shale Produced Water

Effects of Solution pH and Seed Material on MAP Crystallization

Contact Info

Product

Resources

About