Impact of reactor operation on success of struvite precipitation from synthetic liquors

LE Corre, K. S., Valsami-Jones, E., Hobbs, P. and Parsons, S. A. (2007) Impact of reactor operation on success of struvite precipitation from synthetic liquors. Environmental Technology, 28 11: 1245-1256. doi:10.1080/09593332808618885

Author LE Corre, K. S.
Valsami-Jones, E.
Hobbs, P.
Parsons, S. A.
Title Impact of reactor operation on success of struvite precipitation from synthetic liquors
Journal name Environmental Technology   Check publisher's open access policy
ISSN 0959-3330
Publication date 2007-11
Sub-type Article (original research)
DOI 10.1080/09593332808618885
Volume 28
Issue 11
Start page 1245
End page 1256
Total pages 12
Place of publication Essex, United Kingdom
Publisher Taylor & Francis
Language eng
Formatted abstract
A pilot scale reactor was designed and developed to study struvite crystallisation principles. The present work focuses on the possible impact of the reactor's operating parameters on struvite characteristics, and evaluates the performances of the process in removing phosphorus. Struvite precipitation from synthetic liquors was investigated under various situations including: pH, magnesium dosing, addition of foreign ions such as calcium and increasing retention time. Small variations of allthese parameters were found to have significant effects on struvite crystal characteristics and/or production. For instance, an increase of pH from 10.0 to 10.5 favoured the formation of Mg3(PO4)2.22H2O rather than struvite. For molar ratios Ca:Mg above 1:1, calcium ions competed with magnesium to form an amorphous calcium phosphate, hence inhibiting struvite formation. With regards to crystal growth, the process showed some limitations. Indeed, largeamounts of fines were produced, and crystal rarely grew over 100 μm under optimum conditions. Based on those observations, zeta-potential measurements of struvite crystals were investigated. Results revealed highly negative zeta-potential values for all experiments, indicating that this may be a limitation to struvite tendency for agglomeration.
Keyword phosphorus removal
struvite production
particle size
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
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