Crystallization phenomena of magnesium ammonium phosphate (MAP) in a fluidized-bed-type crystallizer

Hirasawa, Izumi; Kaneko, Shogo; Kanai, Yuuji; Hosoya, Shingo; Okuyama, Kumiko; Kamahara, Takashi

doi:10.1016/s0022-0248(01)02268-0

Cited by 15 publications

(10 citation statements)

References 1 publication

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“…Furthermore, the concentration of free ammonia in solution was a function of NH 4 + -N concentration, pH value and temperature [33], which was shown in Eq. (6). Using this formula, it could be calculated that at pH value of 8.5, when the temperature was 0 • C, only about 2.5% of the NH 4 + -N was in the form of free ammonia.…”

Section: Nitrogen Removal and Recovery In Two Reactorsmentioning

confidence: 99%

“…However, such properties also provided the pathway for P and N removal and recovery [4]. Previous studies focused on the optimization of solution conditions [5] as well as the characterization of nucleation and crystal growth [6]. Thermodynamic studies [7,8] and kinetic studies [9] were also conducted to describe the process of struvite crystallization.…”

Section: Introductionmentioning

confidence: 99%

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Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions

Song

Qiu

Yuan

et al. 2011

Journal of Hazardous Materials

153

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Section: Nitrogen Removal and Recovery In Two Reactorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions

Song

Qiu

Yuan

et al. 2011

Journal of Hazardous Materials

153

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“…The factors that affect the phosphorus recovery ratio include chemical factors, such as reaction pH, added magnesium/phosphate-phosphorus (Mg/PO 4 -P) ratio, ammonium-nitrogen/phosphate-phosphorus (NH 4 -N/PO 4 -P) ratio, supersaturation degree, and phosphorus volumetric loading, and physical factors relating to the crystal properties, such as crystal particle size, crystal surface areas, and fluidized conditions (Doyle and Parssons, 2002;Durrant et al, 1999;Hirasawa et al, 2002;Moriyama et al, 2001;Ohlinger et al, 1998;Stratful et al, 2004). Moreover, at some concentrations of suspended solids in the raw water, fine MAP particles are entrained by the suspended solids and flow out with the treated water, causing the recovery ratio to be decreased, in some cases.…”

Section: Experimental Methodsmentioning

confidence: 99%

Use of a Seeder Reactor to Manage Crystal Growth in the Fluidized Bed Reactor for Phosphorus Recovery

Shimamura¹,

Ishikawa²,

Tanaka³

et al. 2007

Water Environment Research

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The authors have been engaged in the development of a phosphorus recovery system capable of maintaining high recovery efficiencies, with the chemical cost suppressed. This time, they conducted demonstration tests of a fluidized bed magnesium ammonium phosphate reactor provided with a seeder reactor for the supernatant from anaerobic digestion using a pilot experimental plant with a wastewater treatment capacity of 20 m 3 /d. For the digestion supernatant with a phosphorus concentration of approximately 300 mg/L, the treated water phosphorus concentration was 10 to 25 mg/L, and the phosphorus recovery efficiency was more than 90%. Relative to the chemical cost in the case of magnesium chloride, the chemical cost in the case of magnesium hydroxide is approximately 40%. Thus, with the new system, it was possible to reduce the running cost while maintaining high recovery efficiencies. Water Environ. Res., 79, 406 (2007).

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“…The struvite crystals were soluble up to 19 . In the present study struvite crystals formed from E. aestuarii were soluble in acidic pH, and as the pH increased the solubility decreased.…”

Section: Solubilitymentioning

confidence: 99%

Characterization of Struvite Produced by an Algal Associated Agarolytic Bacterium Exiguobacterium aestuarii St. SR 101

Leela¹,

Ranishree²,

Perumal³

et al. 2019

J Pure Appl Microbiol

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Biomineralization phenomenon of bacteria proved to have various biotechnological and environmental applications. Production of magnesium ammonium phosphate (struvite) crystals by the agarolytic bacterium Exiguobacterium aestuarii St. SR 101 isolated from red seaweed, Gracilaria corticata was reported for the first time in the present study. Struvite crystallization occurred in the agar culture medium in the presence of the bacterium. Crystal nucleation and growth occurred apparently as a consequence of the localized ion supersaturation, produced by the microbial metabolites and also by the microbial supply of heterogeneous nuclei resulted in crystallization. The crystals were visible between 10 to 15 days after inoculation. The crystal structure of the struvite characterized by optical microscopy, IR spectroscopy, thermogravimetry, powder X-ray diffractometry, and single crystal X-ray diffractometry. The orthorhombic crystal is with the space group Pmn2 1 and unit-cell parameters a = 6.9447 Å, b =6.1329 Å, c = 11.2026Å. Exiguobacterium aestuarii St. SR 101 showed to have the capacity of producing struvite based fertilizer by bioremediation of industrial phosphate wastes.

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Crystallization phenomena of magnesium ammonium phosphate (MAP) in a fluidized-bed-type crystallizer

Cited by 15 publications

References 1 publication

Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions

Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions

Use of a Seeder Reactor to Manage Crystal Growth in the Fluidized Bed Reactor for Phosphorus Recovery

Characterization of Struvite Produced by an Algal Associated Agarolytic Bacterium Exiguobacterium aestuarii St. SR 101

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