Electrochemical resource recovery from digestate to prevent ammonia toxicity during anaerobic digestion

Desloover, Joachim, Woldeyohannis, Andualem Abate, Verstraete, Willy, Boon, Nico and Rabaey, Korneel (2012) Electrochemical resource recovery from digestate to prevent ammonia toxicity during anaerobic digestion. Environmental Science & Technology, 46 21: 12209-12216. doi:10.1021/es3028154


Author Desloover, Joachim
Woldeyohannis, Andualem Abate
Verstraete, Willy
Boon, Nico
Rabaey, Korneel
Title Electrochemical resource recovery from digestate to prevent ammonia toxicity during anaerobic digestion
Journal name Environmental Science & Technology   Check publisher's open access policy
ISSN 0013-936X
1520-5851
Publication date 2012-10-10
Sub-type Article (original research)
DOI 10.1021/es3028154
Volume 46
Issue 21
Start page 12209
End page 12216
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2013
Language eng
Formatted abstract
Ammonia inhibition during anaerobic digestion limits the substrate loading rate and endangers process stability. Furthermore, digestates are interesting feedstocks for nutrient recovery. In this lab-scale study, an electrochemical cell was used to investigate the NH4+ flux from anode to cathode. Under optimal conditions with synthetic wastewater, an NH4+ charge transfer efficiency of 96% and NH4+ flux of 120 g N m−2 d−1 could be obtained at a concomitant electricity input of 5 kWh kg−1 N removed. A more selective NH4+ transfer could be established by maintaining a high concentration of other cations in the cathode compartment. Comparable NH4+ fluxes could be obtained with digestate at an electrical power input of 13 kWh kg−1 N removed and 41% current efficiency. The ammonium level in the digestate could be lowered from 2.1 to 0.8 − 1.2 g N L−1. Interestingly, also potassium fluxes of up to 241 g K+ m−2 d−1 could be obtained at 23% current efficiency. As the cathode can be operated at high pH without the need for chemical addition, stripping and absorption of dissolved ammonia could reach 100% efficiency. By valorization of the generated side products, this technology shows economic potential for practical application.
Keyword Microbial Fuel-Cell
Bioelectrochemical Systems
Exchange Membranes
Swine Manure
Waste-Water
Removal
Electrodialysis
Inhibition
Generation
Transport
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Advanced Water Management Centre Publications
 
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