Enhanced removal of p-fluoronitrobenzene using bioelectrochemical system

Feng, Huajun; Zhang, Xueqin; Liang, Yeru; Wang, Meizhen; Shen, Dongsheng; Ding, Yangcheng; Huang, Bao-Cheng; Shentu, Jiali

doi:10.1016/j.watres.2014.03.027

Cited by 42 publications

(17 citation statements)

References 35 publications

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“…The basic nutrient medium used in the anode and cathode chambers contained 3. 4 (17). A series of amounts of NaCl were added to the medium to adjust the salinity, namely, 0, 15, 30, and 40 g/liter, giving final salinities of about 1%, 2.5%, 4%, and 5%, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Samples were taken from reactors using a 10-ml syringe and were filtered through a 0.22-m filter. The p-FNB and fluoride ion concentrations were determined using an HPLC (Waters Corp., Milford, MA) and an IC plus ion chromatograph (Metrohm AG, Herisau, Switzerland), with methods described in a previous publication (4). The total organic carbon (TOC) content was measured using a TOC analyzer (Shimadzu, Kyoto, Japan).…”

Section: Methodsmentioning

confidence: 99%

“…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).…”

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confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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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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“…Meanwhile, a recent study demonstrated that the removal of p-fluoronitrobenzene was significantly enhanced by the cathodic reduction in a BES (Feng et al, 2014). It is therefore expected that membrane-BES will combine the advantages of BES and MBR with great promise for the removal of emerging contaminants.…”

Section: Removal Of Emerging Contaminantsmentioning

confidence: 99%

Integrating membrane filtration into bioelectrochemical systems as next generation energy-efficient wastewater treatment technologies for water reclamation: A review

Yuan

2015

Bioresource Technology

141

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Bioelectrochemical systems (BES) represent an energy-efficient approach for wastewater treatment, but the effluent still requires further treatment for direct discharge or reuse. Integrating membrane filtration in BES can achieve high-quality effluents with additional benefits. Three types of filtration membranes, dynamic membrane, ultrafiltration membrane and forward osmosis membrane that are grouped based on pore size, have been studied for integration in BES. The integration can be accomplished either in an internal or an external configuration. In an internal configuration, membranes can act as a separator between the electrodes, or be immersed in the anode/cathode chamber as a filtration component. The external configuration allows BES and membrane module to be operated independently. Given much progress and interest in the integration of membrane filtration into BES, this paper has reviewed the past studies, described various integration methods, discussed the advantages and limitations of each integration, and presented challenges for future development.

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“…In the past decade, the biocatalyzed electrolysis system has been drawing wide interest due to its remarkable potential for many applications in wastewater treatment (Cui et al 2014;Korneel Rabaey et al 2010;Mu et al 2009). Many proof-of-concept systems have been successfully tested, and achieved superior performance in treating wastewater containing recalcitrant contaminants, such as azo dye (Mu et al 2009), chloramphenicol Liang et al 2013), p-fluoronitrobenzene (Feng et al 2014), p-nitrophenol (Tao et al 2013), 4-chloronitrobenzene (Yuan et al 2015) and nitrobenzene (Wang et al 2011). However, these experiments were usually conducted with synthetic wastewater substrates and operated in sub-liter-scale reactors for only a few weeks.…”

Section: Introductionmentioning

confidence: 99%

Efficient treatment of azo dye containing wastewater in a hybrid acidogenic bioreactor stimulated by biocatalyzed electrolysis

Wang

Cheng

Wang

et al. 2016

Journal of Environmental Sciences

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In this study, a novel scaled-up hybrid acidogenic bioreactor (HAB) was designed and adopted to evaluate the performance of azo dye (acid red G, ARG) containing wastewater treatment. Principally, HAB is an acidogenic bioreactor coupled with a biocatalyzed electrolysis module. The effects of hydraulic retention time (HRT) and ARG loading rate on the performance of HAB were investigated. In addition, the influent was switched from synthetic wastewater to domestic wastewater to examine the key parameters for the application of HAB. The results showed that the introduction of the biocatalyzed electrolysis module could enhance anoxic decolorization and COD (chemical oxygen demand) removal. The combined process of HAB-CASS presented superior performance compared to a control system without biocatalyzed electrolysis (AB-CASS). When the influent was switched to domestic wastewater, with an environment having more balanced nutrients and diverse organic matters, the ARG, COD and nitrogen removal efficiencies of HAB-CASS were further improved, reaching 73.3% ± 2.5%, 86.2% ± 3.8% and 93.5% ± 1.6% at HRT of 6 hr, respectively, which were much higher than those of AB-CASS (61.1% ± 4.7%, 75.4% ± 5.0% and 82.1% ± 2.1%, respectively). Moreover, larger TCV/TV (total cathode volume/total volume) for HAB led to higher current and ARG removal. The ARG removal efficiency and current at TCV/TV of 0.15 were 39.2% ± 3.7% and 28.30 ± 1.48 mA, respectively. They were significantly increased to 62.1% ± 2.0% and 34.55 ± 0.83 mA at TCV/TV of 0.25. These results show that HAB system could be used to effectively treat real wastewater.

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Enhanced removal of p-fluoronitrobenzene using bioelectrochemical system

Cited by 42 publications

References 35 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

Integrating membrane filtration into bioelectrochemical systems as next generation energy-efficient wastewater treatment technologies for water reclamation: A review

Efficient treatment of azo dye containing wastewater in a hybrid acidogenic bioreactor stimulated by biocatalyzed electrolysis

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