Modelling of phosphorus precipitation in wastewater treatment plants with enhanced biological phosphorus removal

Research Article| January 01 1999 Modelling of phosphorus precipitation in wastewater treatment plants with enhanced biological phosphorus removal M. Maurer; M. Maurer Search for other works by this author on: This Site PubMed Google Scholar M. Boller M. Boller Search for other works by this author on: This Site PubMed Google Scholar Water Sci Technol (1999) 39 (1): 147–163. https://doi.org/10.2166/wst.1999.0033 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Twitter LinkedIn Tools Icon Tools Cite Icon Cite Permissions Search Site Search nav search search input Search input auto suggest search filter All ContentAll JournalsThis Journal Search Advanced Search Citation M. Maurer, M. Boller; Modelling of phosphorus precipitation in wastewater treatment plants with enhanced biological phosphorus removal. Water Sci Technol 1 January 1999; 39 (1): 147–163. doi: https://doi.org/10.2166/wst.1999.0033 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Solubility equilibrium models and/or adsorption models enable the prediction of phosphorus residuals in an effluent of a wastewater treatment plant over a wide range of operating conditions. A generally valid model cannot be given because the model parameters depend on wastewater composition, e.g. on dissolved and particulate water constituents, above all on phosphorus speciation.Chemical precipitation is able to bind ortho-phosphates proportionally to added chemicals and polyphosphates to a great extent. The P-residuals consist mainly of organically bound phosphorus and some residual polyphosphate. In wastewater treatment plants with enhanced biological phosphorus removal (EBPR), an extensive use of precipitation chemicals could suppress the EBPR-ability of the sludge.In EBPR-plants a part of the phosphorus can also be eliminated by chemical precipitation without added chemicals. In experiments with inactivated sludge derived from a wastewater treatment pilot plant, a pH-sensitive and partly reversible precipitation of calcium phosphates was observed at pH values below 8.0.A dynamic model was formulated on the basis of these observations. It contains the following reactions:– Fully reversible precipitation of hydroxydicalcium phosphate (Ca2HPO4(OH)2, HDP) as an intermediate, with a solubility product of 10−22.6 (kmole m−3)5 (20°C).– Formation of hydroxyapatite (Ca5(PO4)3OH, HAP) from HDP. HAP is regarded as a kinetically stable endproduct.If the solubility of HDP is exceeded, then 15.5 gpm−3d−1 of inorganic calcium phosphate (HAP) is fixated irreversibly in the sludge. Activated sludge model, biologically induced precipitation, chemical precipitation, dynamic simulation, enhanced biological phosphorus removal (EBPR), polyphosphate, wastewater treatment This content is only available as a PDF.