Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
641301 | Separation and Purification Technology | 2013 | 9 Pages |
Abstract
The feasibility of implementing a novel strategy to start up and stably operate a partial nitritation (PN) process in an internal-loop airlift reactor was investigated. The results suggested that the PN process was successfully set up through initial complete nitrification followed by adjusting the alkalinity-to-ammonium ratio (Alk/NH4+-N), also known as the 'initial complete nitrification and subsequent partial nitrification' (CNin-PNsub) strategy. A high nitrite accumulation ratio of approximately 98% and a maximum nitrite production rate of 0.91 kg N mâ3 dayâ1 were attained under the conditions of 1.0 mol molâ1Alk/NH4+-N, 1.24 ± 0.71 mg Lâ1 dissolved oxygen, 3.99 ± 2.29 mg Lâ1 free ammonia and 0.69 ± 0.30 mg N Lâ1 free nitrous acid. The stabilized effluent with an NO2--N/NH4+-N ratio of 1.15 ± 0.06 was suitable for subsequently feeding the anaerobic ammonium oxidation (ANAMMOX) process. The modified Stover-Kincannon model was used to analyze the kinetic parameters, and the saturation constant (KB) and maximum ammonium utilization rate (Umax) were determined to be 5.8 and 5.4 kg mâ3 dayâ1, respectively.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Bao-Shan Xing, Yu-Xin Ji, Guang-Feng Yang, Hui Chen, Wei-Min Ni, Ren-Cun Jin,