کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4753334 | 1416555 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Temperature dependence of nitrogen removal activity by anammox bacteria enriched at low temperatures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The anaerobic ammonium oxidation (anammox) process, which is applicable at ambient temperature, is necessary to develop more versatile nitrogen removal technologies. In this study, two anammox reactors, Low-R1 and Low-R2 inoculated with activated sludge respectively in Kumamoto and Hokkaido, Japan, achieved nitrogen removal rates (NRRs) of 1.5 kg-N/m3/day at 20°C. The specific anammox activity (SAA) of the Low-R1 and Low-R2 sludge samples had peaks, respectively, of 2.8 ± 0.3 mg-N/g-VSS/h at 25°C and 4.2 ± 0.3 mg-N/g-VSS/h at 30°C and dropped over the optimum temperature. Moreover, the SAA values of the Low-R1 and Low-R2 were higher at 10-25°C and 10-35°C, respectively, than that of an anammox reactor inoculated with activated sludge in Kumamoto operated at 35°C (Mod-R). The apparent activation energy for anammox of Low-R1, Low-R2, and Mod-R were 108 kJ/mol (10-25°C), 73 kJ/mol (10-30°C), and 89 kJ/mol (10-35°C), respectively. Candidatus Kuenenia stuttgartiensis dominated in the Mod-R sludge. The Low-R1 sludge was comprised of Ca. K. stuttgartiensis, Ca. Brocadia caroliniensis and Ca. B. fulgida and uncultured anammox-like or planctomycete-like bacteria. The Low-R2 sludge was comprised of various uncultured anammox-like or planctomycete-like bacteria. As Low-R2 was constructed, enrichment of freshwater anammox bacteria at low temperature with seed sludge collected from cold regions is expected to be an effective strategy for anammox applications under a wide temperature range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Bioscience and Bioengineering - Volume 123, Issue 4, April 2017, Pages 505-511
Journal: Journal of Bioscience and Bioengineering - Volume 123, Issue 4, April 2017, Pages 505-511
نویسندگان
Giri Park, Masashi Takekawa, Satoshi Soda, Michihiko Ike, Kenji Furukawa,