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• W2088579209 abstract "Chemical precipitation is a useful technology to remove ammonium (NH(4)(+)) from landfill leachate. In this paper, the removal of ammonium from landfill leachate was studied. The objective of this study was to investigate optimum pH, optimum molar ratio, and different kinds of chemicals combinations for magnesium ammonium phosphate (MAP) precipitation. Furthermore, the kinetics of MAP formation and surface characterization were analyzed. The results indicated that ammonium in landfill leachate could be removed with the optimum pH of 9.5. The Mg(2+):NH(4)(+):PO(4)(3-) molar ratio was practically controlled at 1.15:1:1 to remove ammonium effectively and avoid higher concentration of PO(4)(3-) in the effluent. Highest salt concentration was generated by using MgCl(2).6H(2)O plus Na(2)HPO(4).12H(2)O. Compare to MgCl(2).6H(2)O and Na(2)HPO(4).12H(2)O, adding MgO and 85% H(3)PO(4) could significantly minimize the salt concentration, although ammonium removal ratio was 9 percent lower. The lowest ammonium removal ratio was generated by adding Ca(H(2)PO(4))(2).H(2)O and MgSO(4).7H(2)O. Moreover, the kinetics experiment shown that the rate of reaction was closer to the first-order kinetic model. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis indicated that MAP was the main composition of the precipitates. Scanning electron microscopy with energy dispersive X-ray (SEM-EDX) analysis indicated that the unshaped crystal was coarse and its size was irregular, the surface composition of the precipitates contains a great deal of O, P, Mg and trace of C, K, Na, Cl." @default.
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• W2088579209 date "2009-07-30" @default.
• W2088579209 modified "2023-10-14" @default.
• W2088579209 title "Pretreatment of ammonium removal from landfill leachate by chemical precipitation" @default.
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• W2088579209 doi "https://doi.org/10.1016/j.jhazmat.2008.11.101" @default.
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