Production and Basic Morphology of Struvite Crystals from a Pilot-Scale Crystallization Process

A pilot-scale, struvite crystallization process was operated using anaerobic digester supernatants from two, full-scale, treatment plants as influent. It was found that the produced struvite crystals were easily separated from the process and were composed of very pure struvite (91.2 % to 94.1 % pur...

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Bibliographic Details
Published in:Environmental technology 2006-03, Vol.27 (3), p.233-245
Main Authors: Huang, H., Mavinic, D.S., Lo, K.V., Koch, F.A.
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Biotechnology
Chemical engineering
CRYSTAL RETENTION TIME
Crystallization
Crystallization, leaching, miscellaneous separations
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General treatment and storage processes
Magnesium Compounds - chemistry
MAGNESIUM DOSAGE
Methods. Procedures. Technologies
MORPHOLOGY
Others
Phosphates - chemistry
PHOSPHORUS RECOVERY
Pollution
Reactors
Struvite
STRUVITE CRYSTALLIZATION
Various methods and equipments
Waste Disposal, Fluid
Wastes
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Summary:A pilot-scale, struvite crystallization process was operated using anaerobic digester supernatants from two, full-scale, treatment plants as influent. It was found that the produced struvite crystals were easily separated from the process and were composed of very pure struvite (91.2 % to 94.1 % purity), with small amounts of calcium and carbonate, and traces of iron and aluminum. Most of the harvested struvite crystals, which were an aggregation of numerous fine crystals, were round, hard and larger than 1.5 mm in mean diameter. The crystal retention time in the reactor and the magnesium dosage in the supernatant appeared to have a significant effect on the crystal size, hardness and morphology.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593332708618637