Phosphorus recovery from centralised municipal water recycling plants

Bradford-Hartke, Zenah, Lant, Paul and Leslie, Gregory (2012) Phosphorus recovery from centralised municipal water recycling plants. Chemical Engineering Research and Design, 90 1: 78-85. doi:10.1016/j.cherd.2011.08.006


Author Bradford-Hartke, Zenah
Lant, Paul
Leslie, Gregory
Title Phosphorus recovery from centralised municipal water recycling plants
Journal name Chemical Engineering Research and Design   Check publisher's open access policy
ISSN 0263-8762
1744-3563
Publication date 2012-01-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.cherd.2011.08.006
Volume 90
Issue 1
Start page 78
End page 85
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Elsevier
Language eng
Formatted abstract
Depletion of world phosphorus reserves is driving research into options to recover and recycle this essential, non-renewable resource. Phosphate (PO 4 3-) recovery at centralised wastewater treatment plants can be achieved through biosolids reuse or sidestream precipitation though the PO 4 3- levels are low compared with decentralised systems based on source separation. However, the recent growth in membrane based water recycling projects, where reverse osmosis is used to produce high quality water has resulted in the production of liquid waste streams with elevated concentrations of PO 4 3-. Four recycling scenarios using different membrane processes and anaerobic treatment were compared and the potential PO 4 3- recovery via struvite (magnesium ammonium phosphate) from membrane concentrate examined. By incorporating an anaerobic reactor in the process we have been able to investigate the possibility of cogeneration of electricity from methane. Modelling of struvite recovery from membrane concentrate with co-generation indicates a net power requirement of 260kWh/kgP recovered compared with 510kWh/kgP for a system without cogeneration at a water consumption level of 250L/p/d. When water consumption is limited to 80L/p/d, this scenario compares favourably with literature values for recovery from source separated urine which range from 18 to 43kWh/kgP.
Keyword Phosphorus
Water recycling
Struvite
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 9 August 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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