Bromate formation in advanced oxidation processes

Gunten, Urs von; Bruchet, A.; Costentin, E.

doi:10.1002/j.1551-8833.1996.tb06571.x

Cited by 91 publications

(48 citation statements)

References 20 publications

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“…Bromic (I) acid (HOBr) may be more reactive than BrO 3 − because anions are generally difficult to approach the cathode because of electrostatic repulsive forces (Zhao et al, 2012). During continuous MFC operation, bromate ions in the cathode chamber are reduced to bromide ions which can be either adsorbed on the cathode (a carbon electrode) or evolved as bromine gas due to the reaction between two bromide ions which is dependent on the redox potential and electrocatalytic activity occurring in the cathode chamber (Zhao et al, 2012;Von Gunten et al, 1996). During this process, the pH of the catholyte was raised which also depends on the concentration of bromate ions or bromic (I) acid present in the catholyte.…”

Section: Simultaneous Bromate Removal During Mfc Operationmentioning

confidence: 99%

Treatment of phenanthrene and benzene using microbial fuel cells operated continuously for possible in situ and ex situ applications

Adelaja

Keshavarz

Kyazze

2017

International Biodeterioration & Biodegradation

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Bioelectrochemical systems could have potential for bioremediation of contaminants either in situ or ex situ. The treatment of a mixture of phenanthrene and benzene using two different tubular microbial fuel cells (MFCs) designed for either in situ and ex situ applications in aqueous systems was investigated over long operational periods (up to 155 days). For in situ deployments, simultaneous removal of the petroleum hydrocarbons (>90% in term of degradation efficiency) and bromate, used as catholyte, (up to 79 %) with concomitant biogenic electricity generation (peak power density up to 6.75 mWm -2 ) were obtained at a hydraulic retention time (HRT) of 10 days. The tubular MFC could be operated successfully at copiotrophic (100 ppm phenanthrene, 2000 ppm benzene at HRT 30 days) and oligotrophic (phenanthrene and benzene, 50 ppb each, HRT 10 days) substrate conditions suggesting its effectiveness and robustness at extreme substrate concentrations in anoxic environments. In the MFC designed for ex situ deployments, optimum MFC performance was obtained at HRT of 30 h giving COD removal and maximum power output of approximately 77% and 6.75 mWm -2 respectively. The MFC exhibited the ability to resist organic shock loadings and could maintain stable MFC performance. Results of this study suggest the potential use of MFC technology for possible in situ/ex situ hydrocarbon-contaminated groundwater treatment or refinery effluents clean-up, even at extreme contaminant level conditions.

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Section: Simultaneous Bromate Removal During Mfc Operationmentioning

confidence: 99%

Treatment of phenanthrene and benzene using microbial fuel cells operated continuously for possible in situ and ex situ applications

Adelaja

Keshavarz

Kyazze

2017

International Biodeterioration & Biodegradation

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“…Bromide ion catalytically decomposes ozone ( Fig. 1) (von Gunten et al 1996, von Gunten & Oliveras 1998, Salhi & von Gunten 1999, von Gunten & Pinkernell 2000, Gallard et al 2003, Gujer & von Gunten 2003, von Gunten 2003a. In seawater, the primary brominated compounds formed by ozone are hypobromous acid (HOBr), which is in equilibrium with hypobromite (OBr -).…”

Section: Introductionmentioning

confidence: 99%

Ozone treatment of ballast water on the oil tanker S/T Tonsina: chemistry, biology and toxicity

Herwig¹,

Cordell²,

Perrins³

et al. 2006

Mar. Ecol. Prog. Ser.

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Worldwide transfer and introduction of non-indigenous species in ballast water causes significant environmental and economic impact. One way to address this problem is to remove or inactivate organisms that are found in ballast water. In this study, 3 experiments were conducted in Puget Sound, Washington, USA, using a prototype ozone treatment system installed on a commercial oil tanker, the S/T Tonsina. Treatment consisted of ozone gas diffused into a ballast tank for 5 and 10 h. Treatment and control tanks were sampled during the ozonation period for chemistry, culturable bacteria, phytoplankton and zooplankton. Selected fish and invertebrates were placed in cages deployed in the treatment and control tanks. Ozone introduced into seawater rapidly converts bromide (Br -) to bromines (HOBr/OBr -), compounds that are disinfectants. These were measured as total residual oxidant (TRO). Ozone treatment inactivated large portions of culturable bacteria, phytoplankton and zooplankton. The highest reductions observed were 99.99% for the culturable bacteria, > 99% for dinoflagellates and 96% for zooplankton. Caged animal results varied among taxa and locations in the ballast tank. Sheepshead minnows and mysid shrimp were most susceptible, shore crabs and amphipods the least. Distribution of ozone in the treatment tank was not homogenous during experiments, as suggested by the observed TRO concentrations and lower efficacies for inactivating the different taxa in selected ballast tank locations. Low concentrations of bromoform, a disinfection byproduct, were found in treated ballast water.

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“…Relevant articles have reported the effects of catalytic ozonation on bromate formation in the presence of metal oxides. Some of these articles show that • OH formed during catalytic ozone molecular in presence of metal oxides could enhance the formation of bromate (Huang et al 2009;von Gunten et al 1996).…”

Section: Introductionmentioning

confidence: 97%

Inhibition of Nano-Metal Oxides on Bromate Formation during Ozonation Process

Wang³

et al. 2014

Ozone: Science & Engineering

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Simulation studies in pure water were conducted to investigate the effect of nano-metal oxides on bromate (BrO 3 − ) formation as catalysts and the catalytic mechanism. Results indicated that compared to ozonation alone, both nano-SnO 2 and nano-TiO 2 could inhibit the formation of bromate during ozonation process. The inhibition efficiency of BrO 3 − formation by nano-TiO 2 enhanced with the increasing of ozone dosage and the decreasing of nano-TiO 2 dosage, Br − concentrations and the pH value. Possible BrO 3 − minimization mechanism was that nano-TiO 2 accelerated the decomposition of the dissolved O 3 into OH radicals, which rapidly generated H 2 O 2 , and reduced HOBr/OBr − to Br − .

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Bromate formation in advanced oxidation processes

Cited by 91 publications

References 20 publications

Treatment of phenanthrene and benzene using microbial fuel cells operated continuously for possible in situ and ex situ applications

Treatment of phenanthrene and benzene using microbial fuel cells operated continuously for possible in situ and ex situ applications

Ozone treatment of ballast water on the oil tanker S/T Tonsina: chemistry, biology and toxicity

Inhibition of Nano-Metal Oxides on Bromate Formation during Ozonation Process

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