DocumentCode
527006
Title
Notice of Retraction
Effect of filamentous bacteria on the operation of membrane bioreactor (MBR)
Author
Jingli Zhang ; Zhanping Cao
Author_Institution
Dept. of Environ. & Municipal Eng., Tianjin Inst. of Urban Constr., Tianjin, China
Volume
2
fYear
2010
fDate
17-18 July 2010
Firstpage
380
Lastpage
383
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.
The effects of the conditions of nitrogen- and phosphorus-deficiency on the filamentous abundance index (FI), the removal efficiency of pollutants and the membrane fouling were investigated. The results indicated that the removal efficiency of CODCr reduced obviously at nitrogen deficiency and FI was higher than that at phosphorus deficiency. When filamentous bulking happened, FI increased and the micro-animals: swimming ciliates→vorticella→rotifers→Epistylis→arcella became the dominant population in turn, which could be indicative for the operation of the MBR. When FI increased from 2 to 4, Zeta potential lowered and extracellular polymeric substances (EPS) and the relative hydrophobicity (RH) in the mixed liquor rose sharply, that accelerated the membrane fouling. Filamentous bulking has the important influence on the RH of membrane, the dynamic contact angles of polluted membrane were 64°(FI=1), 67°(FI=2), 71°(FI=3), 76°(FI=4)and 81°(FI=5), respectively. The increase of EPS and sludge volume index (SVI) has reinforced the adsorption of filamentous bacteria on the membrane surface, which caused the membrane fouling to become more serious. Filamentous bulking, which influenced the operation of MBR, should be avoided in MBR.
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.
The effects of the conditions of nitrogen- and phosphorus-deficiency on the filamentous abundance index (FI), the removal efficiency of pollutants and the membrane fouling were investigated. The results indicated that the removal efficiency of CODCr reduced obviously at nitrogen deficiency and FI was higher than that at phosphorus deficiency. When filamentous bulking happened, FI increased and the micro-animals: swimming ciliates→vorticella→rotifers→Epistylis→arcella became the dominant population in turn, which could be indicative for the operation of the MBR. When FI increased from 2 to 4, Zeta potential lowered and extracellular polymeric substances (EPS) and the relative hydrophobicity (RH) in the mixed liquor rose sharply, that accelerated the membrane fouling. Filamentous bulking has the important influence on the RH of membrane, the dynamic contact angles of polluted membrane were 64°(FI=1), 67°(FI=2), 71°(FI=3), 76°(FI=4)and 81°(FI=5), respectively. The increase of EPS and sludge volume index (SVI) has reinforced the adsorption of filamentous bacteria on the membrane surface, which caused the membrane fouling to become more serious. Filamentous bulking, which influenced the operation of MBR, should be avoided in MBR.
Keywords
bioreactors; electrokinetic effects; hydrophobicity; membranes; microorganisms; nitrogen; phosphorus; sludge treatment; wastewater treatment; CODCr; Zeta potential; extracellular polymeric substance; filamentous abundance index; filamentous bacteria; filamentous bulking; membrane bioreactor; membrane fouling; mixed liquor; nitrogen deficiency; phosphorus deficiency; pollutant removal efficiency; relative hydrophobicity; sludge volume index; wastewater treatment; Argon; Biomembranes; filamentous bacteria; membrane bioreactor (MBR); membrane fouling; relative hydrophobicity (RH);
fLanguage
English
Publisher
ieee
Conference_Titel
Environmental Science and Information Application Technology (ESIAT), 2010 International Conference on
Conference_Location
Wuhan
Print_ISBN
978-1-4244-7387-8
Type
conf
DOI
10.1109/ESIAT.2010.5567324
Filename
5567324
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