Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7080427 | Bioresource Technology | 2013 | 9 Pages |
Abstract
In the present study, the performance of the partial nitritation (PN) process in a continuous flow internal loop airlift reactor was optimized by applying the response surface method (RSM). The purpose of this work was to find the optimal combination of influent ammonium (NH4+-Ninf), dissolved oxygen (DO) and the alkalinity/ammonium ratio (Alk/NH4+-N) with respect to the effluent nitrite to ammonium molar ratio and nitrite accumulation ratio. Based on the RSM results, the reduced cubic model and the quadratic model developed for the responses indicated that the optimal conditions were a DO content of 1.1-2.1 mg Lâ1, an Alk/NH4+-N ratio of 3.30-5.69 and an NH4+-Ninf content of 608-1039 mg Lâ1. The results of confirmation trials were close to the predictions of the developed models. Furthermore, three types of alkali were comparatively explored for use in the PN process, and bicarbonate was found to be the best alkalinity source.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Ren-Cun Jin, Bao-Shan Xing, Wei-Min Ni,