Removal of phosphate species from solution by adsorption onto calcite used as natural adsorbent

Karageorgiou, K; Paschalis, M; Anastassakis, GN

dc.contributor.author	Karageorgiou, K	en
dc.contributor.author	Paschalis, M	en
dc.contributor.author	Anastassakis, GN	en
dc.date.accessioned	2014-03-01T01:27:03Z
dc.date.available	2014-03-01T01:27:03Z
dc.date.issued	2007	en
dc.identifier.issn	0304-3894	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18325
dc.subject	Adsorbents	en
dc.subject	Adsorption	en
dc.subject	Calcite	en
dc.subject	Environment	en
dc.subject	Liquid effluents purification	en
dc.subject	Orthophosphates adsorption	en
dc.subject	Phosphates	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	Adsorption	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Industrial applications	en
dc.subject.other	pH effects	en
dc.subject.other	Phosphates	en
dc.subject.other	Sedimentation	en
dc.subject.other	Eutrophication	en
dc.subject.other	Liquid effluents purification	en
dc.subject.other	Effluent treatment	en
dc.subject.other	adsorbent	en
dc.subject.other	calcium carbonate	en
dc.subject.other	fertilizer	en
dc.subject.other	mineral	en
dc.subject.other	phosphate	en
dc.subject.other	water	en
dc.subject.other	Adsorption	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Effluent treatment	en
dc.subject.other	Industrial applications	en
dc.subject.other	pH effects	en
dc.subject.other	Phosphates	en
dc.subject.other	Sedimentation	en
dc.subject.other	adsorption	en
dc.subject.other	agricultural application	en
dc.subject.other	calcite	en
dc.subject.other	eutrophication	en
dc.subject.other	pH	en
dc.subject.other	phosphate	en
dc.subject.other	removal experiment	en
dc.subject.other	surface water	en
dc.subject.other	urban area	en
dc.subject.other	wastewater	en
dc.subject.other	addition reaction	en
dc.subject.other	adsorption	en
dc.subject.other	article	en
dc.subject.other	pH measurement	en
dc.subject.other	soil	en
dc.subject.other	Adsorption	en
dc.subject.other	Calcium Carbonate	en
dc.subject.other	Hydrogen-Ion Concentration	en
dc.subject.other	Phosphates	en
dc.subject.other	Time Factors	en
dc.title	Removal of phosphate species from solution by adsorption onto calcite used as natural adsorbent	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jhazmat.2006.02.038	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jhazmat.2006.02.038	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Phosphates are very important basic materials in agricultural and other industrial applications. Phosphorus is often present in low concentrations in wastewater almost solely in the form of organic and inorganic phosphates (ortho- and poly-phosphates). The removal of phosphates from surface waters is generally necessary to avoid problems, such as eutrophication, particularly near urban areas. The usual methods of treatment are either biological or physicochemical by sedimentation. This paper studies the removal of phosphate species by adsorption onto calcite used as natural adsorbent. The phosphate solutions were prepared artificially by adding certain quantities of K2HPO4 in water. The effect of equilibrium pH, phosphate/mineral ratio and contact time was studied. The results showed that pH plays an important role in the removal of phosphate species from solution, with removal being more efficient in the basic pH region. The experimental results also show that adsorption is also efficient for high ratios phosphate/adsorbent. Finally, the adsorption process is time dependant. Based on the experimental results a possible mechanism of phosphate removal onto calcite surface is proposed. As a general conclusion, phosphate species seem to be efficiently removed from solutions using calcite as natural adsorbent. In addition, the adsorption product can be used as fertilizer for acid soils. (c) 2006 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Hazardous Materials	en
dc.identifier.doi	10.1016/j.jhazmat.2006.02.038	en
dc.identifier.isi	ISI:000244091800008	en
dc.identifier.volume	139	en
dc.identifier.issue	3	en
dc.identifier.spage	447	en
dc.identifier.epage	452	en