DocumentCode
3340134
Title
Notice of Retraction
Effect of Temperature Shock on Organisms in EBPR Reactors under Low Temperature
Author
Han Kang ; Shan-Qing Li ; Cai-Yan Li
Author_Institution
Environ. Sci. & Eng., Harbin Inst. of Technol., Harbin, China
fYear
2011
fDate
10-12 May 2011
Firstpage
1
Lastpage
4
Abstract
Notice of Retraction
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
A laboratory-scale anaerobic/aerobic sequencing batch reactor (SBR) as models for enhance biological phosphorus removal (EBPR) processes was used to study the effect of temperature shock on reactor performance and microbial population structure dynamics. SBR fed with acetate as the carbon source were operated for 34 days. The original temperature in SBR was 8 °C. A temperature shock was carried out in reactor. The temperature in 12d~19d increased to 30 °C±2 °C and in 20d~34d decreased to 8 °C±2 °C. The microbial community structure was analyzed by fluorescent in situ hybridization (FISH). TFOs-like shape of phosphorus accumulating organisms (PAOs) was observed when temperature rose to 30 °C. But the shape of PAOs restored to dense cluster when temperature dropped from 30 °C to 8 °C. PAOs stopped absorb substrate under anaerobic phase on 12d when temperature rose to 30 °C. Meanwhile, COD and phosphate removal efficiency was worse in 12d~19d and the amount of PAOs or glycogen accumulating organisms (GAOs) decreased on 19d. This condition showed that temperature shock could disturb organisms´ metabolism. The average of phosphate removal rate was 49.11% in 20d~34d and was higher than it in 0d~11d (was 23.84%). COD removal rate in 20d~34d was the same as it was in 0d~11d. This result indicated that phosphate removal efficiency improved through temperature shock. PAOs were dominant organism in sludge through temperature shock. GAOs- from Alphaproteobacteria were eliminated and GAOs from Gammaproteobacteria survived.
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
A laboratory-scale anaerobic/aerobic sequencing batch reactor (SBR) as models for enhance biological phosphorus removal (EBPR) processes was used to study the effect of temperature shock on reactor performance and microbial population structure dynamics. SBR fed with acetate as the carbon source were operated for 34 days. The original temperature in SBR was 8 °C. A temperature shock was carried out in reactor. The temperature in 12d~19d increased to 30 °C±2 °C and in 20d~34d decreased to 8 °C±2 °C. The microbial community structure was analyzed by fluorescent in situ hybridization (FISH). TFOs-like shape of phosphorus accumulating organisms (PAOs) was observed when temperature rose to 30 °C. But the shape of PAOs restored to dense cluster when temperature dropped from 30 °C to 8 °C. PAOs stopped absorb substrate under anaerobic phase on 12d when temperature rose to 30 °C. Meanwhile, COD and phosphate removal efficiency was worse in 12d~19d and the amount of PAOs or glycogen accumulating organisms (GAOs) decreased on 19d. This condition showed that temperature shock could disturb organisms´ metabolism. The average of phosphate removal rate was 49.11% in 20d~34d and was higher than it in 0d~11d (was 23.84%). COD removal rate in 20d~34d was the same as it was in 0d~11d. This result indicated that phosphate removal efficiency improved through temperature shock. PAOs were dominant organism in sludge through temperature shock. GAOs- from Alphaproteobacteria were eliminated and GAOs from Gammaproteobacteria survived.
Keywords
bioreactors; microorganisms; oxygen; phosphorus compounds; temperature; Alphaproteobacteria; COD; EBPR reactors; FISH; Gammaproteobacteria; acetate; carbon source; enhance biological phosphorus removal; fluorescent in situ hybridization; glycogen accumulating organisms; laboratory-scale aerobic sequencing batch reactor; laboratory-scale anaerobic sequencing batch reactor; low temperature; microbial community structure; microbial population structure dynamics; organism metabolism; phosphate removal; phosphorus accumulating organisms; temperature shock; Electric shock; Inductors; Marine animals; Probes; Shape;
fLanguage
English
Publisher
ieee
Conference_Titel
Bioinformatics and Biomedical Engineering, (iCBBE) 2011 5th International Conference on
Conference_Location
Wuhan
ISSN
2151-7614
Print_ISBN
978-1-4244-5088-6
Type
conf
DOI
10.1109/icbbe.2011.5781233
Filename
5781233
Link To Document