Phosphate Removal from Water Using Novel Process: Significant Role of In Situ–Formed Fe(III)
Publication: Journal of Environmental Engineering
Volume 141, Issue 2
Abstract
This paper investigated the phosphate removal from aqueous solutions using the process. Results indicated that the reaction of and in the process could synergistically increase the removal of phosphate compared with those achieved by Fe(III) coagulation and adsorption at . It was necessary that the optimal Fe/P molar ratio was above 3 for effective phosphate removal because of effects of coexisting substances. At pH 7.0, phosphate removal approached a maximum within approximately 5 min. Competing effects of sulfate, bicarbonate, and silicate on phosphate removal were slight. The presence of and had limited effects on phosphate removal at but resulted in a significant increase at . Coprecipitation was considered as the dominant mechanism about phosphate removal in the process. Fe(III) formed in situ was primarily responsible for phosphate removal. Additionally, in-situ-formed also contributed to the phosphate removal through complexation adsorption. The process had the potential to be utilized in natural water and municipal wastewater treatment for phosphate removal.
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Acknowledgments
This study was funded by the National Natural Science Foundation of China (No. 51108298), the Natural Science Foundation of Tianjin (No. 12JCYBJC14800) and the National Key Technology R&D Program (No. 2012BAB17B02-3). The authors also acknowledge the financial support from the Research Fund of Tianjin Key Laboratory of Aquatic Science and Technology (No. TJKLAST-2011-13).
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© 2014 American Society of Civil Engineers.
History
Received: Jul 23, 2013
Accepted: Jul 11, 2014
Published online: Aug 18, 2014
Discussion open until: Jan 18, 2015
Published in print: Feb 1, 2015
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