Title: Phosphate Separation and Recovery from Wastewater by Novel Electrodialysis
Authors: Zhang, Yang
Desmidt, Evelyn
Van Looveren, Arnaud
Pinoy, Luc
Meesschaert, Boudewijn
Van der Bruggen, Bart # ×
Issue Date: 7-May-2013
Publisher: American Chemical Society
Series Title: Environmental Science & Technology vol:47 issue:11 pages:5888-5895
Abstract: Stimulated by the depletion of phosphate resources, phosphate recovery systems have been studied in
recent years. The use of struvite reactors has proven to be an effective phosphate recovery process. However, the struvite reactor effluent still consists of an excessive amount of phosphate that cannot be recovered nor can be directly discharged. In this study, selectrodialysis (SED) was used to improve the efficiency of phosphate recovery from a struvite reactor: SED was implemented in such a way that phosphate from the effluent of an USAB (upflow anaerobic sludge blanket) reactor was transferred to the recycled effluent of a struvite reactor. Prior to the experiments, synthetic water with chloride and phosphate was used to characterize the efficiency of SED for phosphate separation. Results indicate that SED was successful in concentrating phosphate from the feed stream. The initial current efficiency reached 72%, with a satisfying (9 mmol L−1) phosphate concentration. In the experiments with the anaerobic effluent as the phosphate source for enrichment of the effluent of the struvite reactor, the phosphate flux was 16 mmol
m−2 h−1. A cost evaluation shows that 1 kWh electricity can produce 60 g of phosphate by using a full scale stack, with a desalination rate of 95% on the feed wastewater. Finally, a struvite precipitation experiment shows that 93% of phosphate can be recovered. Thus, an integrated SED-struvite reactor process can be used to improve phosphate recovery from wastewater.
ISSN: 0013-936X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Sustainable Chemical Process Technology TC, Technology Campuses Ghent and Aalst
Sustainable Chemical Process Technology TC
Process Engineering for Sustainable Systems Section
Microbial and Molecular Systems - miscellaneous
Technologiecluster Bioengineering Technologie
Bioengineering Technology TC, Technology Campus Ostend
× corresponding author
# (joint) last author

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