期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 46, 期 21, 页码 12209-12216出版社
AMER CHEMICAL SOC
DOI: 10.1021/es3028154
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资金
- Institute for the Promotion and Innovation through Science and Technology in Flanders (IWT-Vlaanderen) [SB-091144]
- Ghent University [01 MRA 510W]
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.
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