期刊
BIORESOURCE TECHNOLOGY
卷 288, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121599
关键词
Nitritation control; Up-flow fixed bed reactor; Recirculation ratio; Dissolved oxygen; Numerical simulation
资金
- Ministry of Science, Technology Space, Israel [3-11871]
- Rieger Foundation
- Zhakin Foundation
This study explored the stability of partial ammonium oxidation at low feed concentration (50 g N/m(3)), suitable for anammox process, in continuous fixed bed up-flow biofilm reactors with external recirculation-aeration. The reactors, filled with crushed basalt, were fed with synthetic medium at 20-25 degrees C at constant flow-rate with limiting dissolved oxygen concentration controlled by the recirculation ratio (R). Successful nitritation was achieved at R congruent to 4-6 with approx. 50% of NH4+, oxidized to NO3- with < 5% NO3- accumulation. q-PCR analysis along the reactor showed ammonia oxidizing bacteria being the prevalent nitrifiers over the three-fourths of the bed in the flow direction, negligible denitrifiers and absent ammonium oxidizing archaea. A numerical model for predicting the concentration of the nitrogen species and DO was formulated. The model successfully predicted the experimental results and displayed good sensitivity to intrinsic oxygen uptake parameters. The proposed numerical model can serve both as an operational and design tool.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据