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Effect of temperature downshifts on biological nitrogen removal and community structure of a lab-scale aerobic denitrification process

Paper ID Volume ID Publish Year Pages File Format Full-Text
2856 137 2015 9 PDF Available
Title
Effect of temperature downshifts on biological nitrogen removal and community structure of a lab-scale aerobic denitrification process
Abstract

•An aerobic denitrifying process was performed at temperatures from 25 °C to 5 °C.•The optimal temperature of this process for aerobic denitrification was 15 °C.•This process effectively removed COD and nitrate (above 90%) even at 5 °C.•Microbial community was relatively stable over the temperature downshift periods.

Aerobic denitrification bacteria are currently being explored as promising microorganisms with which to treat wastewater containing concentrated ammonium and organic carbon at psychrophilic temperatures. However, little is know regarding the mixed culture of these microbes under low-temperature shocks. In this study, a lab-scale aerobic denitrifying process was established in a sequencing bioreactor at 25 °C, and successfully performed in a short-term temperature downshift period that ranged from 25 °C to 5 °C. The specific aerobic denitrification rate was maximized at 15 °C [15.33 mg N/(g SS h)], and this process effectively removed chemical oxygen demand (COD) and nitrate (above 90%) even at 5 °C. The results of Illumina MiSeq 16S rRNA amplicon analysis revealed a relatively stable microbial community across the transitional periods of temperature. Pseudomonas was the most abuntant genus below 15 °C, and the amount of species Pseudomonas alcaligenes significantly increased at 5 °C with potassium nitrate as the primary nitrogen source. The communities of aerobic denitrifying bacteria in the temperature downshift period were all highly organized functionally, and they were relatively stably across the temperature gradient. These results will enhance understanding regarding the microbial ecology of aerobic denitrifiers in mixed cultures, leading to a more effective controlling of aerobic denitrification process during temperature transition states.

Keywords
Aerobic denitrification; Aerobic processes; Biodegradation; Low temperature sewage; Modeling; Wastewater treatment
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Effect of temperature downshifts on biological nitrogen removal and community structure of a lab-scale aerobic denitrification process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 101, 15 September 2015, Pages 200–208
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us