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Precipitation assessment in wastewater treatment plants operated for biological nutrient removal: a case study in Murcia, Spain

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Precipitation assessment in wastewater treatment plants operated for biological nutrient removal: a case study in Murcia, Spain

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dc.contributor.author	Barat, Ramón
dc.contributor.author	Bouzas Blanco, Alberto
dc.contributor.author	Martí Ortega, Nuria
dc.contributor.author	Ferrer Polo, José
dc.contributor.author	Seco Torrecillas, Aurora
dc.date.accessioned	2019-11-05T15:16:30Z
dc.date.available	2019-11-05T15:16:30Z
dc.date.issued	2009
dc.identifier.citation	Barat, Ramón Bouzas Blanco, Alberto Martí Ortega, Nuria Ferrer Polo, José Seco Torrecillas, Aurora 2009 Precipitation assessment in wastewater treatment plants operated for biological nutrient removal: a case study in Murcia, Spain Journal of Environmental Management 90 2 850 857
dc.identifier.uri	https://hdl.handle.net/10550/72028
dc.description.abstract	The Murcia Este Wastewater Treatment Plant is the largest wastewater treatment plant in Murcia (Spain). The plant operators have continuously found pipe blockage and accumulation of solids on equipment surfaces during the anaerobic digestion and post-digestion processes. This work studies the precipitation problems in the Murcia Este Wastewater Treatment Plant in order to locate the sources of precipitation and its causes from an exhaustive mass balance analysis. The DAF thickener and anaerobic digester mass balances suggest that most of the polyphosphate is released during excess sludge thickening. Despite the high concentrations achieved in the thickened sludge, precipitation does not occur at this point due to the low pH. The increases in ammonium and pH during anaerobic digestion cause precipitation to take place mainly inside the digesters and in downstream processes. This study shows that 50.7% of the available phosphate is fixed in the digester of which 52.0% precipitates as ammonium struvite, 39.2% precipitates as hydroxyapatite and the remaining 8.8% is adsorbed on the surface of the solids. Thermodynamic calculations confirm the precipitation of struvite and hydroxyapatite and also confirm that potassium struvite does not precipitate in the anaerobic digesters.
dc.language.iso	eng
dc.relation.ispartof	Journal of Environmental Management, 2009, vol. 90, num. 2, p. 850-857
dc.subject	Aigües residuals Plantes de tractament
dc.subject	Aigües residuals Depuració Tractament biològic
dc.title	Precipitation assessment in wastewater treatment plants operated for biological nutrient removal: a case study in Murcia, Spain
dc.type	journal article	es_ES
dc.date.updated	2019-11-05T15:16:31Z
dc.identifier.doi	10.1016/j.jenvman.2008.02.001
dc.identifier.idgrec	042075
dc.rights.accessRights	open access	es_ES