Kinetics of Simultaneous Ammonium and Phosphate Recovery by Natural Zeolite

Sandro Pesendorfer, Markus Ellersdorfer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Nowadays, fertilizers containing nitrogen and phosphorus are indispensable for medium and large-scale industrial agriculture. To meet the growing demand of nutrients and reduce the accompanied ecological footprint of primary fertilizer production, processes and technologies for nutrient recovery are necessary and have to be developed. This study represents the basis of an extension of the ion-exchange-loop-stripping process (ILS), which is a combined stripping and ion exchange process using natural zeolite for nitrogen recovery. In batch experiments with a special zeolite filled stirrer, the mechanism and kinetics of simultaneous ammonium and phosphate recovery by natural zeolite were determined. Zeolite loadings of 6.78 mg PO4 3− g −1 were reached and after regeneration, phosphate recovery rates up to 75% of the initial concentration were achieved. The speed of phosphate precipitation is mostly controlled by the pH value of synthetic wastewater. Phosphate removal in simultaneous experiments does not affect ammonium sorption onto zeolite. These findings and the different removal mechanisms of ammonium and phosphate lead to versa-tile applications in wastewater treatment and reveal great potential of natural zeolite in simultaneous nutrient recovery processes.

Original languageEnglish
Article number68
Number of pages11
JournalChemEngineering
Volume5.2021
Issue number4
DOIs
Publication statusPublished - 8 Oct 2021

Bibliographical note

Publisher Copyright: © 2021 by the authors. Li-censee MDPI, Basel, Switzerland.

Cite this