Abstract
A novel micro-pressure swirl reactor (MPSR) was designed and applied to treat domestic wastewater at low temperature by acclimating microbial biomass with steadily decreasing temperature from 15 to 3 °C. Chemical oxygen demand (COD) was constantly removed by 85% and maintained below 50 mg L−1 in the effluent during the process. When the air flow was controlled at 0.2 m3 h−1, a swirl circulation was formed in the reactor, which created a dissolved oxygen (DO) gradient with a low DO zone in the center and a high DO zone in the periphery for denitrification and nitrification. 81% of total nitrogen was removed by this reactor, in which ammonium was reduced by over 90%. However, denitrification was less effective because of the presence of low levels of oxygen. The progressively decreasing temperature favored acclimation of psychrophilic bacteria in the reactor, which replaced mesophilic bacteria in the process of treatment.
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Abbreviations
- MPSR:
-
Micro-pressure swirl reactor
- COD:
-
Chemical oxygen demand
- TN:
-
Total nitrogen
- DO:
-
Dissolved oxygen
- A/A/O:
-
Anaerobic/anoxic/oxic process
- A/O:
-
Anoxic/oxic process
- SBR:
-
Sequence batch reactor
- MLSS:
-
Mixed liquor suspended solids
- OUR:
-
Oxygen uptake rate
- PCR:
-
Polymerase chain reaction
- DGGE:
-
Denaturing gradient gel electrophoresis
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Acknowledgements
This work was supported by the major science and technology program for water pollution control and treatment of China (Granted No. 2014ZX07201-011-004-2), the National Natural Science Foundation of China (Granted No. 51578118, 51378098, 51508079, 51238001 and 51478096) and the Jilin Provincial Natural Science Foundation (Granted No. 20150101072JC, 20140520151JH) for their financial support.
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Ren, Q., Yu, Y., Zhu, S. et al. Characterization of a novel micro-pressure swirl reactor for removal of chemical oxygen demand and total nitrogen from domestic wastewater at low temperature. Biodegradation 28, 145–157 (2017). https://doi.org/10.1007/s10532-017-9784-y
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DOI: https://doi.org/10.1007/s10532-017-9784-y