Struvite precipitation with MgO as a precursor: Application to wastewater treatment

Stolzenburg, Pierre; Capdevielle, Aurélie; Teychené, Sébastien; Biscans, Béatrice

doi:10.1016/j.ces.2015.03.008

Cited by 108 publications

(63 citation statements)

References 20 publications

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“…Although a high degree of phosphate removal could be achieved by using these salts as magnesium sources, their dosage and the adjustment of the solution pH were difficult to control well due to fluctuation in the phosphate concentration of the wastewaters; the use of these salts also readily increased the salinity in the effluent, inhibiting the microbial activity in the biological treatment process that followed 12 13 . Further, to reduce the cost of phosphate recovery, some low-cost magnesium sources such as low-grade MgO and Mg(OH) 2 were also utilized as magnesium sources 14 15 . Unfortunately, these reagents were found to significantly decrease the purity of the harvested struvite due to the excess added MgO/Mg(OH) 2 .…”

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confidence: 99%

Crystallization and precipitation of phosphate from swine wastewater by magnesium metal corrosion

Huang

Liu

Yang

2015

Sci Rep

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This paper presents a unique approach for magnesium dosage in struvite precipitation by Mg metal corrosion. The experimental results showed that using an air bubbling column filled with Mg metal and graphite pellets for the magnesium dosage was the optimal operation mode, which could significantly accelerate the corrosion of the Mg metal pellets due to the presence of graphite granules. The reaction mechanism experiments revealed that the solution pH could be used as the indicator for struvite crystallization by the process. Increases in the Mg metal dosage, mass ratio of graphite and magnesium metal (G:M) and airflow rate could rapidly increase the solution pH. When all three conditions were at 10 g L–1, 1:1 and 1 L min–1, respectively, the phosphate recovery efficiency reached 97.5%. To achieve a high level of automation for the phosphate recovery process, a continuous-flow reactor immersed with the graphite-magnesium air bubbling column was designed to harvest the phosphate from actual swine wastewater. Under conditions of intermittently supplementing small amounts of Mg metal pellets, approximately 95% of the phosphate could be stably recovered as struvite of 95.8% (±0.5) purity. An economic analysis indicated that the process proposed was technically simple and economically feasible.

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confidence: 99%

Crystallization and precipitation of phosphate from swine wastewater by magnesium metal corrosion

Huang

Liu

Yang

2015

Sci Rep

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“…Kenaikan pH dapat meningkatkan laju nukleasi kristal s truvite [10]. Selama proses presipitasi akan terjadi penurunan pH akibat penambahan reagen MgCl2 dan juga karena pelepasan proton selama pembentukan struvite [11].…”

Section: Pengaruh Ph Terhadap Efisiensi Removal Fosfat Dan Amoniumunclassified

Recovery Fosfat dan Amonium Menggunakan Teknik Presipitasi Struvite

Iswarani¹,

Warmadewanthi²

2018

JTITS

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“…A prática mais utilizada é a precipitação da estruvita em pH alcalino. [77][78][79][80] A estruvita se forma rapidamente, na presença de íons amônio e magnésio, quando a concentração de fosfato na água alcança valores entre 100 e 200 mg L -1 . Esta técnica também pode ser aplicada na digestão anaeróbia do lodo, devido à alta concentração de fósforo inorgânico e amônia em reatores onde ocorre este tipo de tratamento.…”

Section: Reservas De Rocha Fosfática No Mundounclassified