Analysis of an upflow bioreactor system for nitrogen removal via autotrophic nitrification and denitrification
- 作者：Kasidit Nootong ; Wen K. Shieh
- 关键词：Bioreactor ; Nitrification ; Autotrophic denitrification ; Oxygenation ; Biomass matrix
- 刊名：Bioresource Technology
- 出版年：2008
- 期刊代码：11_09608524
- 类别：ce
- 出版时间：September 2008
- 卷：99
- 期：14
- 页码：6292-6298
- 文件大小：156 K
摘要
The upflow bioreactor system without biomass-liquid separation unit was evaluated for its efficacy in sustaining autotrophic nitrification and denitrification (AND). The bioreactor system was capable of sustaining AND by means of carefully controlled oxygenation to achieve the maximum 
removal rate of 0.054 g N g VSS−1 day−1 (38%removal efficiency) at the oxygen influx and nitrogen loading rate of 3.68 mg O2 h−1 L-bioreactor−1 and 182 mg N day−1 L-bioreactor−1, respectively. Additional nitrogen removal was achieved in a two-stage bioreactor configuration due to endogenous denitrification under long mean cell residence time. Quiescent conditions maintained in the bioreactor provided stable hydrodynamic environments for the chemoautotrophic biomass matrix, which revealed porous, loosely-structured, and mat-like architecture. More than 95%of the total biomass holdup (1.3–1.5 g VSS) was retained, thereby producing low biomass washout rate (
40 mg VSS day−1) with VSS < 11 mg VSS L−1 in the effluent.
40 mg VSS day−1) with VSS < 11 mg VSS L−1 in the effluent.