Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 36, Issue 2, Pages 231-238Publisher
SPRINGER
DOI: 10.1007/s00449-012-0779-0
Keywords
Bioelectrochemical system; Biocathode; Nitrate reduction; Electrochemical treatment; Denitrification
Funding
- Kyung Hee University-New researcher program [20090735]
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Electrochemical treatment of nitrate ions was attempted using different catalysts on the cathode in bioelectrochemical denitrification systems. The carbon cathode coated by biofilm (biocathode) could remove 91 % of nitrate ions at 1.0 V, which was almost same as the Pt-coated electrode (90 %). The exchange current density of biocathode was 0.0083 A/m(2), which was almost 22 times higher than with an abiotic plain carbon cathode. The formation of intermediate products in nitrate reduction varied depending on the cell voltage. At 0.5 V, a large portion of nitrate was converted to ammonia, but at more increased cell voltage (0.7 and 1 V) a high amount of nitrite ions was found with little ammonia formation in cathodic solution. The maximum nitrate removal rate was 0.204 mg NO3-N/cm(2)d by biocathode, while plain carbon paper showed only 0.176 mg NO3-N/cm(2)d. Electrochemical analysis of chronoamperometry showed a higher stable current generation for biocathode (3.1 mA) and Pt-coated cathode (2.8 mA) as compared to plain carbon (0.6 mA) at 0.7 V of poised voltage.
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