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Controlling struvite particles’ size using the up-flow velocity

Struvite crystallization has been widely investigated, but little attention has been focused on particle size, an important characteristic in fertilizers that affects the agronomic response. Although there is no standard, it is an interesting parameter to be controlled as each crop and soil require a specific fertilizer size. Few attempts have been made to increase particle size. In air-lift reactors, the up-flow velocity could be used as a controlling parameter for particle size. It is hypothesized that the up-flow velocity determines the minimum theoretical equivalent diameter that can be recovered. Its effectiveness as a controlling parameter for particle size was evaluated in a combined air-lift reactor at different up-flow velocities (from 13.3 to 26.3mh-1). Particle size was found to be directly correlated with the up-flow velocity, and according to the theoretical approach about the minimum equivalent diameter. Moreover, particle growth was promoted by operating the crystallizer in continuous mode at the best up-flow velocity (22.6mh-1), having an increase of the mean particle size in time (138.6h) from 201μm to 314μm, and recovering particles up to 800-1000μm. The up-flow velocity control did not affect the phosphate recovery rates (>90%) and XRD confirmed that only pure struvite crystals were recovered. Therefore, this study shows that struvite can be recovered from a waste stream and control its particle size using the up-flow velocity to adjust to the customers’ requirements

This research has received funding from the European Community’s Framework Programme (FP7/2007-2013) under Grant Agreement n 603744, within the ManureEcoMine project. E.T. was financially supported by the Catalan Government (2014FI_B 00264). LEQUIA has been recognized as a consolidated research group by the Catalan Government with code 2014-SGR-1168. LEQUIA would like to thank the University of Girona (MPCUdG2016/137) for its financial support

© Chemical Engineering Journal, 2016, vol.302, p. 819-827

Elsevier

Author: Tarragó Abella, Elena
Puig Broch, Sebastià
Ruscalleda Beylier, Maël
Balaguer i Condom, Maria Dolors
Colprim Galceran, Jesús
Date: 2016 October 15
Abstract: Struvite crystallization has been widely investigated, but little attention has been focused on particle size, an important characteristic in fertilizers that affects the agronomic response. Although there is no standard, it is an interesting parameter to be controlled as each crop and soil require a specific fertilizer size. Few attempts have been made to increase particle size. In air-lift reactors, the up-flow velocity could be used as a controlling parameter for particle size. It is hypothesized that the up-flow velocity determines the minimum theoretical equivalent diameter that can be recovered. Its effectiveness as a controlling parameter for particle size was evaluated in a combined air-lift reactor at different up-flow velocities (from 13.3 to 26.3mh-1). Particle size was found to be directly correlated with the up-flow velocity, and according to the theoretical approach about the minimum equivalent diameter. Moreover, particle growth was promoted by operating the crystallizer in continuous mode at the best up-flow velocity (22.6mh-1), having an increase of the mean particle size in time (138.6h) from 201μm to 314μm, and recovering particles up to 800-1000μm. The up-flow velocity control did not affect the phosphate recovery rates (>90%) and XRD confirmed that only pure struvite crystals were recovered. Therefore, this study shows that struvite can be recovered from a waste stream and control its particle size using the up-flow velocity to adjust to the customers’ requirements
This research has received funding from the European Community’s Framework Programme (FP7/2007-2013) under Grant Agreement n 603744, within the ManureEcoMine project. E.T. was financially supported by the Catalan Government (2014FI_B 00264). LEQUIA has been recognized as a consolidated research group by the Catalan Government with code 2014-SGR-1168. LEQUIA would like to thank the University of Girona (MPCUdG2016/137) for its financial support
Format: application/pdf
ISSN: 1385-8947
Document access: http://hdl.handle.net/10256/13211
Language: eng
Publisher: Elsevier
Collection: AGAUR/2014-2016/2014 SGR 1168
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.cej.2016.06.036
Articles publicats (D-EQATA)
info:eu-repo/grantAgreement/EC/FP7/603744
Is part of: © Chemical Engineering Journal, 2016, vol.302, p. 819-827
Rights: Tots els drets reservats
Subject: Nucleació
Nucleation
Struvita
Struvite
Title: Controlling struvite particles’ size using the up-flow velocity
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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