Abstract
The aim of this work was to examine the influence of mineral elements on phosphorus (P) release from heated waste sludges. Energy dispersive X-ray microanalysis suggested that P was associated with Al, Ca, and Mg on the surface of waste sludge biomass obtained from six wastewater treatment plants. The extent of P release decreased with increasing the total concentrations of Al, Mg, and Ca in waste sludges. The addition of Al 2(SO 4) 3, Ca(OH) 2, CaCl 2, MgSO 4, or NaAlO 2 to activated sludges, which were taken from a bench-scale EBPR process, reduced the P release significantly.
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