Influence of electric current on bacterial viability in wastewater treatment

Wei, V.; Elektorowicz, Maria; Oleszkiewicz, Jan A.

doi:10.1016/j.watres.2011.07.011

Cited by 112 publications

(41 citation statements)

References 20 publications

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“…Indeed, these results agree with many studies conducted at low voltages using electrophoretic forces [6], [7].…”

Section: B Effect Of Dep On the Medium Parameterssupporting

confidence: 92%

Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Larbi¹,

Ltaief²,

Hawari³

et al. 2017

IJESD

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Abstract-Effective application of dielectrophoretic forces in membrane bioreactor (MBR) systems has the potential to suppress membrane fouling. Nevertheless, minimizing the impact of the electric field on biomass suspension is essential to maintain the efficiency of the wastewater treatment process. In this study, interdigitated cylindrical electrodes (IDE), placed inside the membrane module, were used to generate dielectrophoresis (DEP) in an MBR system. The viability of the biomass was determined at different voltages (5-150 V) after 1-hour exposure to a pulsed alternating current (AC) electric field. The results of the behavioral response of the microorganisms revealed that at low voltage applications, the bacteria exhibited good performance and no major impact was found on their viability/metabolism. Whereas at high voltage applications (beyond 100 V), the current intensity and medium temperature increased due to the joule heating effect and caused a significant decline in the bacterial activity and pollutant removal efficiency as a result of bacterial lysis.

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“…Indeed, these results agree with many studies conducted at low voltages using electrophoretic forces [6], [7].…”

Section: B Effect Of Dep On the Medium Parameterssupporting

confidence: 92%

Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Larbi¹,

Ltaief²,

Hawari³

et al. 2017

IJESD

View full text Add to dashboard Cite

show abstract

“…Kojima et al (1992) used 0.2-0.6 V potential to stimulate MKN45 cells (Carcinoma cells) in a culture dish with Pt as the anode and cathode, and showed that current stimulation could change the DNA, protein synthesis, membrane permeability and cell growth. Furthermore, heterotrophic bacterial viability was also observed to be not significantly affected when the applied electric current density was less than 6.2 A/m 2 , but was partly inactivated at current densities more than 12.3 A/m 2 in a membrane reactor (Wei et al, 2011). The same observation was also true for the autotrophic species where the denitrification and viability drastically decreased at electrical stimulation with densities more than 16 mA/cm 2 but remained active and viable at 2 and 4 mA/cm 2 (Safari et al, 2013).…”

Section: Introductionmentioning

confidence: 97%

Effect of electro-stimulation on activity of heterotrophic denitrifying bacteria and denitrification performance

Liu

Tong

Chen

et al. 2015

Bioresource Technology

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“…Moreover, at higher voltage, breakage of bacterial cells and production of SMP are observed to occur which increases fouling (Zhang et al, 2015). Wei V. et al (2011) proved that increasing DC intensity (6.2, 12.3, and 24.7 A/m 2 ) also increases pH (from nearly neutral to around pH 10) of electrolytic biomass fluid causing 10, 15, and 29% death percentage, respectively.…”

Section: Microbial Activitymentioning

confidence: 92%

“…Microbial analyses have revealed that a stressor such as strong electric current provides negative impact on the microbial properties (i.e., metabolism, physiology, shape, and mobility) (Wei V. et al, 2011). Increasing intensity of electric field (DC > 2.5 A/m 2 ) decreases nitrification rate by 20% (Li et al, 2001).…”

Section: Microbial Activitymentioning

confidence: 99%

“…The application of a direct current (DC) field to MBRs has proven to be more effective compared to other fouling control methods, however, it is also associated with high energy consumption and affect bacterial lifespan (Wei V. et al, 2011;Zeyoudi et al, 2015). New and cheaper developments suggest that intermittent application of minute electric field also enhances membrane filterability and is similarly effective in controlling fouling as that with continuous DC field (Akamatsu et al, 2010(Akamatsu et al, , 2012Liu et al, 2012a,b).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combination of Electrochemical Processes with Membrane Bioreactors for Wastewater Treatment and Fouling Control: A Review

Ensano

Borea

Naddeo

et al. 2016

Front. Environ. Sci.

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This paper provides a critical review about the integration of electrochemical processes into membrane bioreactors (MBR) in order to understand the influence of these processes on wastewater treatment performance and membrane fouling control. The integration can be realized either in an internal or an external configuration. Electrically enhanced membrane bioreactors or electro membrane bioreactors (eMBRs) combine biodegradation, electrochemical and membrane filtration processes into one system providing higher effluent quality as compared to conventional MBRs and activated sludge plants. Furthermore, electrochemical processes, such as electrocoagulation, electrophoresis, and electroosmosis, help to mitigate deposition of foulants into the membrane and enhance sludge dewaterability by controlling the morphological properties and mobility of the colloidal particles and bulk liquid. Intermittent application of minute electric field has proven to reduce energy consumption and operational cost as well as minimize the negative effect of direct current field on microbial activity which are some of the main concerns in eMBR technology. The present review discusses important design considerations of eMBR, its advantages as well as its applications to different types of wastewater. It also presents several challenges that need to be addressed for future development of this hybrid technology which include treatment of high strength industrial wastewater and removal of emerging contaminants, optimization study, cost benefit analysis and the possible combination with microbial electrolysis cell for biohydrogen production.

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Influence of electric current on bacterial viability in wastewater treatment

Cited by 112 publications

References 20 publications

Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Assessment of the Effect of Dielectrophoresis (DEP) on the Viability of Activated Sludge Biomass

Effect of electro-stimulation on activity of heterotrophic denitrifying bacteria and denitrification performance

Combination of Electrochemical Processes with Membrane Bioreactors for Wastewater Treatment and Fouling Control: A Review

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