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- W2364632076 abstract "The paper introduces the investigation of the effects of solution conditions on the precipitation of calcium phosphate for recovery from wastewater with batch experiments, thermodynamic calculations and X-ray diffraction. The solution conditions include the solution pH value, the initial Ca/P molar ratio, and the concentrations of carbonate and humic substances. Our study results indicate that when the phosphate concentrations were 0.351.4 mmol/L and the initial Ca/P molar ratios ≥1.67, the precipitation reactions might proceed very quickly with suitable solution pH supplied. When the initial Ca/P molar ratio was 1.67 and the phosphate concentrations were 0.35 mmol/L, 0.70 mmol/L and 1.4 mmol/L, the minimum pH values for significantly rapid precipitation of calcium phosphate would be 9.5, 9.0 and 8.0, respectively. The final product tends to a thermodynamically highly stable phase, that is, hydroxyapatite. However, at solution pH 8.0, carbonate and HS would begin to inhibit the precipitation of calcium phosphate, and their influence would be getting weaker when the solution pH ≥9.0. Both the increase of solution pH value and that of initial Ca/P molar ratio may help to increase the precipitation efficiency, therefore contributing to overcoming the inhibition of carbonate and humic substances on the precipitation. Thus, it can be seen that, both the solution pH value and the initial Ca/P molar ratio are two controlling factors for phosphorus recovery from wastewater. Nevertheless, to keep the precipitate purity of calcium phosphate, the solution pH value and initial Ca/P molar ratios should be moderately kept throughout the precipitation process." @default.
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- W2364632076 date "2007-01-01" @default.
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- W2364632076 title "Effects of solution conditions on the precipitation of calcium phosphate for recovery" @default.
- W2364632076 hasPublicationYear "2007" @default.
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