The effect of C/N ratio on nitrogen removal in a bioelectrochemical system

► Influence of C/N ratio on autotrophic and heterotrophic denitrification were investigated. ► Electron transform and utilization efficiency of anode and cathode were calculated. ► Effects of C/N ratio on microbial metabolism were discussed. The effect of C/N ratios of 2, 2.7, and 3.5 on nitrogen re...

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Veröffentlicht in:Bioresource technology 2013-03, Vol.132, p.91-98
Hauptverfasser: Huang, Baocheng, Feng, Huajun, Wang, Meizhen, Li, Na, Cong, Yanqing, Shen, Dongsheng
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Sprache:eng
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Zusammenfassung:► Influence of C/N ratio on autotrophic and heterotrophic denitrification were investigated. ► Electron transform and utilization efficiency of anode and cathode were calculated. ► Effects of C/N ratio on microbial metabolism were discussed. The effect of C/N ratios of 2, 2.7, and 3.5 on nitrogen removal in a bioelectrochemical system (BES) was investigated. Starch was used as a carbon source for the electrogenesis phenomenon we observed in a previous study. The results showed that an increased C/N ratio helped the BES to remove nitrate and depress nitrite accumulation but did not increase autotrophic denitrification. Nitrate and total nitrogen removal were increased from 0.69±0.02gm−3h−1 to 1.09±0.16gm−3h−1, and from 0.52±0.08gm−3h−1 to 0.97±0.06gm−3h−1, respectively, when the C/N ratio was increased from 2.0 to 3.5. However, the autotrophic denitrification ratio decreased from 72.74% to 50.23% with the same increase in the C/N ratio. High C/N ratios postponed the excretion of soluble microbial products and increased electrogenesis, but did not improve the anode transformation efficiency.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2012.12.192