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Struvite Crystallization of Anaerobic Digestive Fluid of Swine Manure Containing Highly Concentrated Nitrogen.

Lee EY, Oh MH, Yang SH, Yoon TH - Asian-australas. J. Anim. Sci. (2015)

Bottom Line: In this study, the optimal operation factors for struvite crystallization for removing and recovering nitrogen and phosphorus from anaerobic digestive fluid of swine manure containing highly concentrated nitrogen was determined.Except for special circumstances, the digestion fluid was centrifuged (10,000 rpm, 10 min) and then the supernatant was used for the experiment at room temperature and 100 rpm.In addition, struvite crystal structure was confirmed through X-ray diffraction analysis.

View Article: PubMed Central - PubMed

Affiliation: Animal Environment Division, National Institute of animal Science, RDA, Suwon 441-706, Korea .

ABSTRACT
In this study, the optimal operation factors for struvite crystallization for removing and recovering nitrogen and phosphorus from anaerobic digestive fluid of swine manure containing highly concentrated nitrogen was determined. Every experiment for the struvite crystallization reaction was conducted by placing 1,000 mL of digestion fluid in a 2,000 mL Erlenmeyer flask at various temperatures, pH, and mixing speed. Except for special circumstances, the digestion fluid was centrifuged (10,000 rpm, 10 min) and then the supernatant was used for the experiment at room temperature and 100 rpm. The optimal mole ratio of PO4 (3-):Mg(2+) was 1:1.5, and the pH effect ranging from 9 to 11 was similar, when mixed for 1 hour. Under this condition, the removal efficiency of NH4 (+)-N and PO4 (3-)-P was 40% and 88.6%, respectively. X-shaped crystal was observed by light and scanning electron microscopy. In addition, struvite crystal structure was confirmed through X-ray diffraction analysis.

No MeSH data available.


Related in: MedlinePlus

X-ray diffraction patterns of struvite crystal.
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f5-ajas-28-7-1053: X-ray diffraction patterns of struvite crystal.

Mentions: The solids obtained in the experiments were subjected to XRD analysis. The powdered XRD pattern of synthetic and struvite pellets matched very well with that of the published pattern for struvite (Figure 5). The slight difference between the XRD patterns of the two kinds of struvite may be due to the amount of impurity present in the struvite pellets. Infrared (IR) spectra for both synthetic struvite and struvite pellets were also consistent with the published IR spectrum of struvite in the wave number range of 400 to 4,000 cm−1 with 100% recovery of spectra according to the standards. As such, the struvite samples were considered to be a single-phase material.


Struvite Crystallization of Anaerobic Digestive Fluid of Swine Manure Containing Highly Concentrated Nitrogen.

Lee EY, Oh MH, Yang SH, Yoon TH - Asian-australas. J. Anim. Sci. (2015)

X-ray diffraction patterns of struvite crystal.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4478498&req=5

f5-ajas-28-7-1053: X-ray diffraction patterns of struvite crystal.
Mentions: The solids obtained in the experiments were subjected to XRD analysis. The powdered XRD pattern of synthetic and struvite pellets matched very well with that of the published pattern for struvite (Figure 5). The slight difference between the XRD patterns of the two kinds of struvite may be due to the amount of impurity present in the struvite pellets. Infrared (IR) spectra for both synthetic struvite and struvite pellets were also consistent with the published IR spectrum of struvite in the wave number range of 400 to 4,000 cm−1 with 100% recovery of spectra according to the standards. As such, the struvite samples were considered to be a single-phase material.

Bottom Line: In this study, the optimal operation factors for struvite crystallization for removing and recovering nitrogen and phosphorus from anaerobic digestive fluid of swine manure containing highly concentrated nitrogen was determined.Except for special circumstances, the digestion fluid was centrifuged (10,000 rpm, 10 min) and then the supernatant was used for the experiment at room temperature and 100 rpm.In addition, struvite crystal structure was confirmed through X-ray diffraction analysis.

View Article: PubMed Central - PubMed

Affiliation: Animal Environment Division, National Institute of animal Science, RDA, Suwon 441-706, Korea .

ABSTRACT
In this study, the optimal operation factors for struvite crystallization for removing and recovering nitrogen and phosphorus from anaerobic digestive fluid of swine manure containing highly concentrated nitrogen was determined. Every experiment for the struvite crystallization reaction was conducted by placing 1,000 mL of digestion fluid in a 2,000 mL Erlenmeyer flask at various temperatures, pH, and mixing speed. Except for special circumstances, the digestion fluid was centrifuged (10,000 rpm, 10 min) and then the supernatant was used for the experiment at room temperature and 100 rpm. The optimal mole ratio of PO4 (3-):Mg(2+) was 1:1.5, and the pH effect ranging from 9 to 11 was similar, when mixed for 1 hour. Under this condition, the removal efficiency of NH4 (+)-N and PO4 (3-)-P was 40% and 88.6%, respectively. X-shaped crystal was observed by light and scanning electron microscopy. In addition, struvite crystal structure was confirmed through X-ray diffraction analysis.

No MeSH data available.


Related in: MedlinePlus