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 |
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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. |
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ISSN: | 0960-8524 1873-2976 |
DOI: | 10.1016/j.biortech.2012.12.192 |