Novel technique for phosphorus recovery from aqueous solutions using amorphous calcium silicate hydrates (A-CSHs)

Okano, Kenji; Uemoto, Masahide; Kagami, Jumpei; Miura, Kanako; Aketo, Tsuyoshi; Toda, Masaya; Honda, Kohsuke; Ohtake, Hisao

doi:10.1016/j.watres.2013.01.052

Cited by 118 publications

(50 citation statements)

References 28 publications

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“…Under this pH condition, the existence form of phosphorus is HPO 4 2− . Thus, high concentrations of Ca 2+ , OH − , and HPO 4 2− formed, which facilitates the formation of hydroxyapatite in a weak alkaline environment [33]. As shown in Figure 10, comparing the three systems (i.e., P-CSHs, modified P-CSHs-PEG2000, and the modified P-CSHs-PEG2000 combined with the internal recycle reactor) for phosphorus recovery, the internal recycle reactor enhances porous calcium silicate hydrates to recover phosphorus from electroplating wastewater.…”

Section: The Process Of Phosphorus Recovery In Internal Recyclementioning

confidence: 99%

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

Guan

Tian

2017

Journal of Chemistry

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In this experiment, the porous calcium silicate hydrates (P-CSHs) were prepared via a hydrothermal method and then modified by polyethylene glycol (PEG). The modified P-CSHs combined with an internal recycle reactor could successfully recover the phosphorus from electroplating wastewater. The modified P-CSHs were characterized by X-ray diffraction (XRD), N 2 adsorptiondesorption isotherms, and Fourier transform infrared spectroscopy (FT-IR). After compared with different samples, the modified P-CSHs-PEG2000 sample had larger specific surface area of 87.48 m 2 /g and higher pore volume of 0.33 cm 3 /g, indicating a high capacity for phosphorus recovery. In the process of phosphorus recovery, the pH value of solution was increased to 9.5, which would enhance the recovery efficiency of phosphorus. The dissolution rate of Ca 2+ from P-CSH-PEG2000 was fast, which was favorable for phosphorus precipitation and phosphorus recovery. The effects of initial concentration of phosphorus, P-CSHs-PEG2000 dosage, and stirring speed on phosphorus recovery were analyzed, so the optimal operation conditions for phosphorus recovery were obtained. The deposition was analyzed by XRD, N 2 adsorption-desorption, and SEM techniques; it was indicated that the pore volume and surface area of the P-CSHs-PEG2000 were significantly reduced, and the deposition on the surface of P-CSHs-PEG2000 was hydroxyapatite.

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Section: The Process Of Phosphorus Recovery In Internal Recyclementioning

confidence: 99%

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

Guan

Tian

2017

Journal of Chemistry

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“…Hence, there is a continuous need for developing new adsorption materials with high adsorption efficiency, easy preparation and low-cost, environmental friend and little secondary pollution. Due to mesoporous calcium silicate (MCS) high specific surface area, porosity and negative charge strength [10,11], its application of water treatment gains attention from the researchers gradually. But the application in the removal of heavy metal ions is still not much [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Mesoporous Calcium Silicate by Template Method and Its Adsorption Characteristic for Pb2+

Liu¹,

Li²,

Liu³

et al. 2017

dteees

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Abstract. Mesoporous calcium silicate (MCS) was synthesized by template method using calcium nitrate tetrahydrate and sodium metasilicate nonahydrate as raw materials, cetyl trimethyl ammonium bromide-tetramethyl ammonium hydroxide as template. Its structure was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunuaer-Emmett-Teller (BET) surface analysis, and scanning electron microscopy (SEM

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“…Sewage sludge contains significant amounts of phosphorus, and in order to recover the phosphorus, some studies have been carried out [1][2][3][4][5][6]. The phosphorus which is recovered by acidic treatment contains a lot of aluminum [7].…”

Section: Introductionmentioning

confidence: 99%

Conversion of Aluminum Phosphate to Sodium Phosphate

Takahashi¹,

Takemoto²,

Ooyagi³

et al. 2016

JMSE-A

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Abstract:The phosphorus recovered from sewage sludge by acidic treatment is mainly composed of aluminum phosphate. To make a wide utilization of recovered phosphorus, removal of the aluminum component is considered a very important matter. In order to find a method to convert aluminum phosphate to sodium phosphate, a basic investigation was carried out. A reagent of aluminum phosphate was dissolved by aqueous solution of sodium hydroxide, and mixed with sodium silicate to make a alunino-silicate gel. Sodium phosphate was recovered from residue water in the gel.

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Novel technique for phosphorus recovery from aqueous solutions using amorphous calcium silicate hydrates (A-CSHs)

Cited by 118 publications

References 28 publications

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

Synthesis of Mesoporous Calcium Silicate by Template Method and Its Adsorption Characteristic for Pb2+

Conversion of Aluminum Phosphate to Sodium Phosphate

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