title: The effect of C/N ratio on nitrogen removal in a bioelectrochemical system.
abstract: 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(-3)h(-1) to 1.09±0.16gm(-3)h(-1), and from 0.52±0.08gm(-3)h(-1) to 0.97±0.06gm(-3)h(-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.
authors: College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
authors: Baocheng
authors: B
authors: Huang
authors: Huajun
authors: H
authors: Feng
authors: Meizhen
authors: M
authors: Wang
authors: Na
authors: N
authors: Li
authors: Yanqing
authors: Y
authors: Cong
authors: Dongsheng
authors: D
authors: Shen
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001674:Bioelectric Energy Sources; D057919:Biological Oxygen Demand Analysis; D002244:Carbon / Q000378:metabolism*; D058440:Denitrification / Q000502:physiology*; D008956:Models, Chemical; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology; D013213:Starch / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D014874:Water Pollutants, Chemical; D002244:Carbon; D013213:Starch; D009584:Nitrogen