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- Title
两段SBR串联工艺处理低C/N城市污水的效率研究.
- Authors
唐玉朝; 陈徐庆; 薛莉娉; 伍昌年; 王坤; 王品之; 黄显怀; 傅前君; 刘俊; 宋永莲
- Abstract
In this paper, a bench scale experiment was performed in an attempt to tackle the problems of low denitrification rate of some municipal wastewater with low carbon nitrogen ratio (C/N). A two-stage SBR series process system (SBR I -- SBR I) was thus developed, and the biological denitrification efficiency of the process system was studied. SBR I was operating according the procedure: inlet--anoxic--sedimentation--effluent--aerobic, while SBR I: inlet--anoxic--aerobic--sedimentation--effluent. The experimental results showed that as the influent C/N dropped to 4.0, the water filling ratio of each SBR was 0.40 and the operation cycle time 8h, the average concentration of total nitrogen (TN) in effluent less than 6.5 mg/L; C/N ratio in the influent greatly affected the TN removal ratio, i.e. as the influent C/N ranged from 3.5 to 3.7, TN removal ratio would be no less than 80%, and when C/N became greater than 3.7, TN removal ratio being 82%~84%; when the C/N increased close to 5.0, TN removal ratio would be greater than 86%, however, as C/N decreased less than 3.4, TN removal ratio dropped remarkably. In addition, in the case of a sufficient carbon source, the theoretical removal ratio of TN in this process was equal to 1-n2, "n" being the water filling ratio of the reactors SBR I and SBR I. Under the operation condition of low water filling ratio, the denitrification rate of the experimental value of was close to that of the theoretical value, but water filling ratio was increased denitrification rate of the experimental value was slightly higher. The experimental results also showed that when increasing the operation cycle time of each SBR from 8 h+8 h to 12 h+12 h, or adding 3 g/L powdered zeolite, as a sort of ammonia nitrogen adsorbent, could improve TN removal ratio of the process system, moreover, TN removal ratio could be near to or even more than 90%; and it was possible to realize deep denitrification for the wastewater with low-carbon source, with TN concentration of the effluent being far lower than the discharge limit of TN enforced by the relevant national standard (GB 18918-2002). It is expected that the experimental results could provide a new approach for the standard-upgrading of municipal wastewater treatment plants.
- Subjects
SEWAGE disposal plants; DENITRIFICATION; SEWAGE; SEDIMENTATION &; deposition; ZEOLITES; NITROGEN removal (Water purification)
- Publication
Environmental Science & Technology (10036504), 2022, Vol 45, Issue 5, p15
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.0009.22.338