Limits...
A novel composite conductive microfiltration membrane and its anti-fouling performance with an external electric field in membrane bioreactors.

Huang J, Wang Z, Zhang J, Zhang X, Ma J, Wu Z - Sci Rep (2015)

Bottom Line: The fouling rate in continuous-flow MBRs treating wastewater was also decreased by about 50% for this conductive membrane with 2 V/cm electric field compared to the control test during long-term operation.The enhanced electrostatic repulsive force between foulants and membrane, in-situ cleaning by H2O2 generated from oxygen reduction, and decreased production of soluble microbial products and extracellular polymeric substances contributed to fouling mitigation in this MBR.The results of this study shed light on the control strategy of membrane fouling for achieving a sustainable operation of MBRs.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Siping Road 1239, Shanghai 200092, P.R. China.

ABSTRACT
Membrane fouling remains an obstacle to wide-spread applications of membrane bioreactors (MBRs) for wastewater treatment and reclamation. Herein, we report a simple method to prepare a composite conductive microfiltration (MF) membrane by introducing a stainless steel mesh into a polymeric MF membrane and to effectively control its fouling by applying an external electric field. Linear sweep voltammetry and electrochemical impedance spectroscopy analyses showed that this conductive membrane had very good electrochemical properties. Batch tests demonstrated its anti-fouling ability in filtration of bovine serum albumin, sodium alginate, humic acid and silicon dioxide particles as model foulants. The fouling rate in continuous-flow MBRs treating wastewater was also decreased by about 50% for this conductive membrane with 2 V/cm electric field compared to the control test during long-term operation. The enhanced electrostatic repulsive force between foulants and membrane, in-situ cleaning by H2O2 generated from oxygen reduction, and decreased production of soluble microbial products and extracellular polymeric substances contributed to fouling mitigation in this MBR. The results of this study shed light on the control strategy of membrane fouling for achieving a sustainable operation of MBRs.

Show MeSH
Removal of (A) COD and (B) NH4+-N in two MBR systems.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4363883&req=5

f4: Removal of (A) COD and (B) NH4+-N in two MBR systems.

Mentions: Pollutant removal efficiencies in the two parallel MBRs were monitored during long-term operation. Chemical oxygen demand (COD) and ammonium (NH4+-N) removal of two MBR systems are illustrated in Fig. 4. During 96-d operation, the average effluent COD concentration and COD removal efficiency for the control MBR were 14.7 ± 9.3 mg/L and 96.1 ± 2.5%, and 11.8 ± 7.8 mg/L and 96.9 ± 2.1% for the electrochemical MBR (with electric field), showing that the electrochemical MBR achieved slightly better permeate quality. The removal efficiencies in NH4+-N in the two reactors were almost the same (>99.3%). The results indicate that the MBR in the presence of 2 V/cm electric field also had no adverse impacts on pollutant removal.


A novel composite conductive microfiltration membrane and its anti-fouling performance with an external electric field in membrane bioreactors.

Huang J, Wang Z, Zhang J, Zhang X, Ma J, Wu Z - Sci Rep (2015)

Removal of (A) COD and (B) NH4+-N in two MBR systems.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4363883&req=5

f4: Removal of (A) COD and (B) NH4+-N in two MBR systems.
Mentions: Pollutant removal efficiencies in the two parallel MBRs were monitored during long-term operation. Chemical oxygen demand (COD) and ammonium (NH4+-N) removal of two MBR systems are illustrated in Fig. 4. During 96-d operation, the average effluent COD concentration and COD removal efficiency for the control MBR were 14.7 ± 9.3 mg/L and 96.1 ± 2.5%, and 11.8 ± 7.8 mg/L and 96.9 ± 2.1% for the electrochemical MBR (with electric field), showing that the electrochemical MBR achieved slightly better permeate quality. The removal efficiencies in NH4+-N in the two reactors were almost the same (>99.3%). The results indicate that the MBR in the presence of 2 V/cm electric field also had no adverse impacts on pollutant removal.

Bottom Line: The fouling rate in continuous-flow MBRs treating wastewater was also decreased by about 50% for this conductive membrane with 2 V/cm electric field compared to the control test during long-term operation.The enhanced electrostatic repulsive force between foulants and membrane, in-situ cleaning by H2O2 generated from oxygen reduction, and decreased production of soluble microbial products and extracellular polymeric substances contributed to fouling mitigation in this MBR.The results of this study shed light on the control strategy of membrane fouling for achieving a sustainable operation of MBRs.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Siping Road 1239, Shanghai 200092, P.R. China.

ABSTRACT
Membrane fouling remains an obstacle to wide-spread applications of membrane bioreactors (MBRs) for wastewater treatment and reclamation. Herein, we report a simple method to prepare a composite conductive microfiltration (MF) membrane by introducing a stainless steel mesh into a polymeric MF membrane and to effectively control its fouling by applying an external electric field. Linear sweep voltammetry and electrochemical impedance spectroscopy analyses showed that this conductive membrane had very good electrochemical properties. Batch tests demonstrated its anti-fouling ability in filtration of bovine serum albumin, sodium alginate, humic acid and silicon dioxide particles as model foulants. The fouling rate in continuous-flow MBRs treating wastewater was also decreased by about 50% for this conductive membrane with 2 V/cm electric field compared to the control test during long-term operation. The enhanced electrostatic repulsive force between foulants and membrane, in-situ cleaning by H2O2 generated from oxygen reduction, and decreased production of soluble microbial products and extracellular polymeric substances contributed to fouling mitigation in this MBR. The results of this study shed light on the control strategy of membrane fouling for achieving a sustainable operation of MBRs.

Show MeSH