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- Title
基于HCO<sub>3</sub><sup>-</sup>/N控制部分亚硝化及影响因素.
- Authors
潘永宝; 杨雅馨; 陈宣; 孙婷; 姬涛; 惠璠; 吕永涛
- Abstract
The stable operation of partial nitritation(PN) is the key to obtain a high nitrogen removal efficiency of the two-step partial nitritation-anammox process. By controlling the molar ratio of HCO3- to NH+4, start-up and stable operation of partial nitritation treating high ammonium wastewater were achieved in a sequencing batch reactor(SBR) under aerobic conditions, generating an NO2-N/NH4+ molar ratio of around 1.09±0.08 in the effluent. Thereafter, the effects of different HCO3-/N and pH on partial nitritation were investigated through batch experiments. With the increasing ratios of HCO3- to NH+4 in the influent from 0.5∶1,1∶1,1.5∶1 to 2∶1,33.62%,57.41%,100% and 100% of ammonium was converted to nitrite. When the ratio of HCO3- to NH+4 was controlled at 1∶1, together with the pH increased from 7 to 8 and 9, the conversion efficiency of ammonia nitrogen increased from 56.89%,61.32% to 100%, and the ammonia oxidation rate was 0.39,0.42 and 0.49 mg N/(g MLSS·min), respectively. Both HCO3-/N and pH affect ammonia oxidation rate, conversion efficiency and nitrite oxidation simultaneously by affecting the concentration of free ammonia(FA) and free nitrous acid(FNA). Therefore, the HCO3-/N of 1∶1 as well as pH of 8 were found to be the essential parameters for stable operation of partial nitritation.
- Subjects
NITROUS acid; BATCH reactors; AMMONIA; NEW business enterprises; SEWAGE
- Publication
Applied Chemical Industry, 2023, Vol 52, Issue 7, p2088
- ISSN
1671-3206
- Publication type
Article