Microwave Irradiation as a Way to Reutilize the Recovered Struvite Slurry and to Enhance System Performance

Cho, Joon Hee; Lee, Jin Eui; Ra, Chang‐Six

doi:10.5187/jast.2009.51.4.337

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…The theoretical optimal value of 1:1:1 cannot be achieved because the NH 4 + :PO 4 3− ratio of wastewater cannot be 1:1, and, thus, when the PO 4 3 -P concentration is lower, the values of the variables in the reaction can vary. Generally, the ammonia removal rate is within ~20% to 40% ( Cho et al, 2009 ; Ye et al, 2011 ), and the phosphorus removal rate is relatively high, ranging from 67% to a maximum of 99% ( Kim et al, 2004 ; Liu et al, 2011a ).…”

Section: Resultsmentioning

confidence: 99%

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

Lee

Yang

et al. 2015

Asian Australas. J. Anim. Sci

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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 PO43−:Mg2+ 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 PO43−-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.

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Section: Resultsmentioning

confidence: 99%

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

Lee

Yang

et al. 2015

Asian Australas. J. Anim. Sci

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“…Rahman et al. (2011) and Cho, Lee, and Ra (2009) have reported that it is possible to remove 93% of P and 40% of N from wastewater through struvite crystallization. In addition to supplying N and magnesium (Mg), struvite is also considered as a P fertilizer source and alternative to natural PR (Münch & Barr, 2001; Shu, Schneider, Jegatheesan, & Johnson, 2006).…”

Section: Introductionmentioning

confidence: 99%

Potato response to struvite compared with conventional phosphorus fertilizer in Eastern Canada

et al. 2020

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In acidic soils with high phosphorus (P) fixing capacity, P application at levels higher than crop requirements is common in crops with high P demands such as potato (Solanum tuberosum L.), which could lead to eutrophication. Recycled sources of P fertilizer, such as struvite, can be efficient in meeting crop P demands while minimizing P losses. The objective of this study-conducted in four provinces over 3 yr (2016-2018, with 12 sites in total) in Eastern Canada-was to assess potato response to P fertilizer as triple superphosphate (TSP) or a mixture of TSP with struvite. Eight P treatments were applied with five increasing P rates as TSP (0, 26, 52, 79, and 105 kg P ha −1 ) and three treatments as a mixture of TSP and struvite (25, 50, and 75% (w/w) struvite) at a rate of 79 kg P ha −1 . Phosphorus availability indices measured multiple times over the growing season were composed of Mehlich-3 extracted P (P M3 ), soil P adsorbed on anion exchange membranes (P AEMs ), and petiole P-PO 4 (P petiole ) concentrations. There was a potato yield response to P inputs at all sites, with the control treatment showing lower potato yield at all sites. Potato yield, P petiole , P M3 , and P AEMs were comparable between 100% TSP and TSP+struvite at the same rate, except at one site where struvite at a higher proportion depressed yield and was associated with lower P uptake. Overall, the use of struvite could be a sustainable mean to address long-term globally P scarcity.

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“…Therefore, the effluents must be treated before discharging them into water bodies. A number of conventional methods exist to remove N and P from wastewater including biological nitrification and denitrification (Bergmans, 2011), microwave irradiation (Cho et al, 2009) and struvite precipitation (Nelson et al, 2003;Kataki et al, 2016). Struvite precipitation, or struvite crystallization, as the term interchangeably used, has been extensively practiced for the removal of the environmentally harmfull ammonium nitrogen (NH4-N) and phosphorus (PO4 -) from wastewater treatment plants, due to its high efficiency, simplicity and environmental sustainability (Darwish et al, 2016;Kurtulus & Tas, 2011).…”

Section: Introductionmentioning

confidence: 99%

On precipitation of struvite (MgNH4PO4.6H2O)

Muryanto

2017

JoSSE

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Excessive input of N and P into water bodies causes eutrophication which leads to deterioration of aquatic evironments and has adverse effects naturally and economically. It is therefore urgent to remove N and P from wastewater prior to disposal into inland and coastal waters. Among the various removal methods, controlled struvite precipitation is preferred. Struvite (MgNH4PO4.6H2O) precipitates uncontrollably under the specific conditions producing a scale deposit causing persistent problems in industries and wastewater treatment plants. The scale deposit clogs the piping system and impair plant equipment. On the other hand, thanks to its composition and properties, struvite is a potential fertilizer. In medical field, struvite is a common component of kidney stones. A number of process parameters govern the struvite precipitation. This paper briefly presents these parameters: pH, molar ratios, temperature, mixing, and presence of foreign ions. pH level is considered as the most important variable affecting the precipitation of struvite and the pH level: 9.5 to 10.5 is seen as the optimum. For an effective precipitation the molar ratios of the struvite components, i.e. Mg:N:P should be at least unity. With regard to struvite solubility, the effect of temperature, in the range of 21oC to 49oC, is conflicting, which is probably due to different experimental conditions. Whilst agitation is not regarded as a decisive parameter, the influence of foreign ions, notably divalent metal ions, on struvite morphology and change of crystal phases is significant.

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Microwave Irradiation as a Way to Reutilize the Recovered Struvite Slurry and to Enhance System Performance

Cited by 10 publications

References 21 publications

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

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

Potato response to struvite compared with conventional phosphorus fertilizer in Eastern Canada

On precipitation of struvite (MgNH4PO4.6H2O)

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