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Ureolytic phosphate precipitation from anaerobic effluents

Evelyn Desmidt UGent, Willy Verstraete UGent, Jan Dick, Boudewijn D Meesschaert and Marta Carballa (2009) WATER SCIENCE AND TECHNOLOGY. 59(10). p.1983-1988
abstract
In this work, the elimination of phosphate from industrial anaerobic effluents was evaluated at lab-scale. For that purpose, the ureolytic method previously developed for the precipitation of Ca2+ from wastewater as calcite was adapted for the precipitation of phosphate as struvite. In the first part of the study, computer simulations using MAPLE and PHREEQC were performed to model phosphate precipitation from wastewater as struvite. The results obtained showed that relative high concentrations of ammonium and magnesium are needed to precipitate phosphate as struvite. The total molar concentrations ratio of Mg2+: PO43--P:NH4+ required to decrease PO43--P concentrations from 20 to 6mg PO43--P/l at pH 8.4-8.5 was estimated on 4.6:1:8. In the second part of the study, lab-scale experiments with either synthetic wastewater or the anaerobic effluent from a vegetable processing industry were carried out in batch and continuous mode. Overall, the continuous operation at a hydraulic retention time (HRT) of 2.4 h and an added molar concentration [Mg2+]:[PO43 -P]:[ NH4+] ratio of 1.6:1:2.3 resulted in a constant pH value in the reactor (around 8.5) and an efficient phosphate removal (>90%) to residual levels of 1-2 mg PO43--P/l. Different operational conditions, such as the initial phosphate concentration, HRT and the use of CaCl2 or MgO instead of MgCl2, were analysed and the performance of the reactor was satisfactory under a broad range of them. Yet, overall, optimal results (higher phosphate removal) were obtained with MgCl2.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
modelling, magnesium ammonium phosphate, phosphate removal, struvite, urea, INDUSTRIAL WASTE-WATER, CALCIUM REMOVAL
journal title
WATER SCIENCE AND TECHNOLOGY
Water Sci. Technol.
volume
59
issue
10
pages
1983 - 1988
Web of Science type
Article
Web of Science id
000266782800013
JCR category
WATER RESOURCES
JCR impact factor
1.094 (2009)
JCR rank
36/64 (2009)
JCR quartile
3 (2009)
ISSN
0273-1223
DOI
10.2166/wst.2009.193
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
751551
handle
http://hdl.handle.net/1854/LU-751551
date created
2009-09-22 11:26:04
date last changed
2009-11-24 15:54:21
@article{751551,
  abstract     = {In this work, the elimination of phosphate from industrial anaerobic effluents was evaluated at lab-scale. For that purpose, the ureolytic method previously developed for the precipitation of Ca2+ from wastewater as calcite was adapted for the precipitation of phosphate as struvite. In the first part of the study, computer simulations using MAPLE and PHREEQC were performed to model phosphate precipitation from wastewater as struvite. The results obtained showed that relative high concentrations of ammonium and magnesium are needed to precipitate phosphate as struvite. The total molar concentrations ratio of Mg2+: PO43--P:NH4+ required to decrease PO43--P concentrations from 20 to 6mg PO43--P/l at pH 8.4-8.5 was estimated on 4.6:1:8. In the second part of the study, lab-scale experiments with either synthetic wastewater or the anaerobic effluent from a vegetable processing industry were carried out in batch and continuous mode. Overall, the continuous operation at a hydraulic retention time (HRT) of 2.4 h and an added molar concentration [Mg2+]:[PO43 -P]:[ NH4+] ratio of 1.6:1:2.3 resulted in a constant pH value in the reactor (around 8.5) and an efficient phosphate removal ({\textrangle}90\%) to residual levels of 1-2 mg PO43--P/l. Different operational conditions, such as the initial phosphate concentration, HRT and the use of CaCl2 or MgO instead of MgCl2, were analysed and the performance of the reactor was satisfactory under a broad range of them. Yet, overall, optimal results (higher phosphate removal) were obtained with MgCl2.},
  author       = {Desmidt, Evelyn and Verstraete, Willy and Dick, Jan and Meesschaert, Boudewijn D and Carballa, Marta},
  issn         = {0273-1223},
  journal      = {WATER SCIENCE AND TECHNOLOGY},
  keyword      = {modelling,magnesium ammonium phosphate,phosphate removal,struvite,urea,INDUSTRIAL WASTE-WATER,CALCIUM REMOVAL},
  language     = {eng},
  number       = {10},
  pages        = {1983--1988},
  title        = {Ureolytic phosphate precipitation from anaerobic effluents},
  url          = {http://dx.doi.org/10.2166/wst.2009.193},
  volume       = {59},
  year         = {2009},
}

Chicago
Desmidt, Evelyn, Willy Verstraete, Jan Dick, Boudewijn D Meesschaert, and Marta Carballa. 2009. “Ureolytic Phosphate Precipitation from Anaerobic Effluents.” Water Science and Technology 59 (10): 1983–1988.
APA
Desmidt, E., Verstraete, W., Dick, J., Meesschaert, B. D., & Carballa, M. (2009). Ureolytic phosphate precipitation from anaerobic effluents. WATER SCIENCE AND TECHNOLOGY, 59(10), 1983–1988.
Vancouver
1.
Desmidt E, Verstraete W, Dick J, Meesschaert BD, Carballa M. Ureolytic phosphate precipitation from anaerobic effluents. WATER SCIENCE AND TECHNOLOGY. 2009;59(10):1983–8.
MLA
Desmidt, Evelyn, Willy Verstraete, Jan Dick, et al. “Ureolytic Phosphate Precipitation from Anaerobic Effluents.” WATER SCIENCE AND TECHNOLOGY 59.10 (2009): 1983–1988. Print.