Journal of Industrial and Engineering Chemistry, Vol.58, 216-221, February, 2018
Enhanced phosphorus bioavailability and heavy metal removal from sewage sludge ash through thermochemical treatment with chlorine donors
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Direct application of sewage sludge ash (SSA) to agriculture is mostly prohibited due to its heavy metals and limited bioavailability. Thermochemical treatment of SSA with Cl-donors were carried out to remove heavy metals and enhance P bioavailability. MgCl2 and CaCl2 removed more heavy metal than other Cl-donors. Pb was completely removed followed by Cd, Zn, Cu. They also increased P bioavailability by the conversion of Al?P to Ca/Mg-P which was confirmed by chemical fractionation. XRD confirmed the conversion of AlPO4 to Ca5(PO4)3Cl, Ca3(PO4)2, and Mg3(PO4)2 by the thermochemical treatment.
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