Electrolytic stimulation of bacteria Enterobacter dissolvens by a direct current

She, Pengfei; Song, Bo; Xing, Xin‐Hui; Loosdrecht, M.C.M. van; Liu, Zheng

doi:10.1016/j.bej.2005.08.033

Cited by 115 publications

(48 citation statements)

References 26 publications

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“…In agreement with our work, previous studies (11,12,13,14,37) have linked enhanced microbial metabolism in the BES. Longterm electrical application resulted in selection of salt-adapted and specific p-FNB-mineralizing microorganisms in the BES.…”

supporting

confidence: 93%

“…In agreement, electrical stimulation has been also shown to spur microbial growth (12) and enhance the cell density (13). The cell density of the bacterium Enterobacter dissolvens was found to be significantly improved and microbial activity was increased 2-fold (14). More studies show that electrical stimulation may result in evolution of specific communities that are able to adapt to unique environments (15) or in the development of specific microbial functions (16).…”

mentioning

confidence: 76%

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Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

Feng

Zhang

Guo

et al. 2015

Appl Environ Microbiol

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cFed batch bioelectrochemical systems (BESs) based on electrical stimulation were used to treat p-fluoronitrobenzene (p-FNB) wastewater at high salinities. At a NaCl concentration of 40 g/liter, p-FNB was removed 100% in 96 h in the BES, whereas in the biotic control (BC) (absence of current), p-FNB removal was only 10%. By increasing NaCl concentrations from 0 g/liter to 40 g/liter, defluorination efficiency decreased around 40% in the BES, and in the BC it was completely ceased. p-FNB was mineralized by 30% in the BES and hardly in the BC. Microorganisms were able to store 3.8 and 0.7 times more K ؉ and Na ؉ intracellularly in the BES than in the BC. Following the same trend, the ratio of protein to soluble polysaccharide increased from 3.1 to 7.8 as the NaCl increased from 0 to 40 g/liter. Both trends raise speculation that an electrical stimulation drives microbial preference toward K ؉ and protein accumulation to tolerate salinity. These findings are in accordance with an enrichment of halophilic organisms in the BES. Halobacterium dominated in the BES by 56.8% at a NaCl concentration of 40 g/liter, while its abundance was found as low as 17.5% in the BC. These findings propose a new method of electrical stimulation to improve microbial salinity resistance.O rganofluorine compounds, especially fluorinated aromatic compounds, are widely used in the production of adhesives, pesticides, dyes, pharmaceuticals, refrigerants, and surfactants (1). They were found to inhibit enzymes, modify cell-to-cell communication, and disrupt membrane transport as well as energy generation processes (2). Due to their high toxicity and recalcitrance, conventional biological methods fail to efficiently remove organofluorine from wastewaters (1, 3). On the other hand, bioelectrochemical treatment has been proved to be an effective method to minimize refractory properties of typical p-fluoronitrobenzene-contaminated organofluorine wastewater (4).Salinity poses another serious challenge to the treatment of such organofluorine-containing wastewater. Typically, addition of strong acid or alkali to adjust the pH during production processes results in high salt concentrations in organofluorine wastewaters. As an example, salinity concentrations from an organofluorine industry effluent in China typically fluctuate between 2 and 3%, with a maximum of 5%. Conventional physicochemical treatment processes for salinity wastewater are energy intensive and costly. Although biological processes have been recommended for salinity wastewater treatment (5, 6), high salinity may cause cell plasmolysis and even the death of microorganisms due to osmotic pressure increases (7,8). To address this issue, wastewaters are always diluted, which results in a meaningless freshwater consumption and increases operational cost (5). An enhancement of microbial salinity resistance would enable implementation of biological methods for salinity wastewater treatment, which could be succeeded by acclimatization and enrichment of haloduric or halophilic strains (5). H...

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supporting

confidence: 93%

mentioning

confidence: 76%

Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

Feng

Zhang

Guo

et al. 2015

Appl Environ Microbiol

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“…The oxygen produced at the anode causes high dehydrogenase activity in the surrounding anode chamber. The lower the pH and the longer the processing time will slow the dehydrogenase activity, so finding the most optimal conditions in terms of duration, pH or nutrient will be useful for maintaining the sustainability of EKSF-Bio system (Fan et al, 2015;Harbottle et al, 2009;Li et al, 2010;She et al, 2006).…”

Section: Biodegradationmentioning

confidence: 99%

[Preprint] An overview of electrokinetic soil flushing and its effect on bioremediation of hydrocarbon contaminated soil

Ramadan¹,

effendi²,

Sari³

et al. 2018

Preprint

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Combination of electrokinetic soil flushing and bioremediation (EKSF-Bio) technology has attracted many researchers attention in the last few decades. Electrokinetic is used to increase biodegradation rate of microorganisms in soil pores. Therefore, it is necessary to use solubilizing agents such as surfactants that can improve biodegradation process. This paper describes the basic understanding and recent development associated with electrokinetic soil flushing, bioremediation, and its combination as innovative hybrid solution for treating hydrocarbon contaminated soil.Surfactant has been widely used in many studies and practical applications in remediation of 2 hydrocarbon contaminant, but specific review about those combination technology cannot be found.Surfactants and other flushing/solubilizing agents have significant effects to increase hydrocarbon remediation efficiency. Thus, this paper is expected to provide clear information about fundamental interaction between electrokinetic, flushing agents and bioremediation, principal factors, and an inspiration for ongoing and future research benefit.

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“…The electrical treatment of microorganism leads to changes in membrane permeability, metabolic behavior, and cell growth (Golzio et al 2004;She et al 2006;Loghavi et al 2007), resulting in enhanced/inhibited biodegradation of organic pollutants. The positive or negative effects of DC mainly depend on current intensity, duration of treatment, and microbial type.…”

Section: Introductionmentioning

confidence: 99%

Phenol Degradation by Suspended Biomass in Aerobic/Anaerobic Electrochemical Reactor

Ailijiang

Chang

et al. 2016

Water Air Soil Pollut

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The effect of direct current (DC) on phenol biodegradation under aerobic/anaerobic condition was investigated in this study using a bioelectrochemical reactor. It was found that phenol biodegradation was inhibited with current ranged from 10 to 40 mA. The growth of biomass was reduced to 43.2 ± 6.6 % for aerobic sludge and 38.6 ± 7.3 % for anaerobic sludge, but the loosely bound extracellular polymer substances (LB-EPS) were increased 91.2 ± 1.3 % for aerobic sludge and 62.8 ± 0.8 % for anaerobic sludge as the current increased from 10 to 40 mA. Adenosine triphosphate (ATP) content of aerobic sludge was also reduced 0.481 ± 0.04-fold and 0.512 ± 0.05-fold lower and 1.34 ± 0.13-fold higher than that of the control when the current was increased from 10 to 40 mA. The results of phosphate buffer saline adding treatment indicated that lower pH caused by a DC above 10 mA was responsible for the reduced phenol biodegradation, leading to the reduction of biomass. However, lower intensity of current (5 mA) had no significant impact on phenol degradation rate, pH, LB-EPS, ATP content, and cell growth of aerobic/anaerobic sludge. These results give us a more detailed understanding of the effects of electricity on the treatment of phenol containing wastewater.

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Electrolytic stimulation of bacteria Enterobacter dissolvens by a direct current

Cited by 115 publications

References 26 publications

Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

Electrical Stimulation Improves Microbial Salinity Resistance and Organofluorine Removal in Bioelectrochemical Systems

[Preprint] An overview of electrokinetic soil flushing and its effect on bioremediation of hydrocarbon contaminated soil

Phenol Degradation by Suspended Biomass in Aerobic/Anaerobic Electrochemical Reactor

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