Anaerobic degradation of benzene in BTX mixtures dependent on sulfate reduction

Phelps, Craig D.; Kazumi, Junko; Young, L. Y.

doi:10.1111/j.1574-6968.1996.tb08612.x

Cited by 67 publications

(47 citation statements)

References 12 publications

(4 reference statements)

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“…The first aromatics-oxidizing, sulfate-reducing isolate from Guaymas Basin sediments, Desulfothermus naphthae strain TD3, grows optimally between 55 and 65°C, and couples the oxidation of C 6 –C 16 alkanes and 3-methyloctane to sulfate reduction, although its specific alkane activation and degradation mechanism remains unknown (Rüter et al, 1994; Ehrenreich, 1996). Shortly after the isolation of TD3, a benzene-utilizing enrichment culture was obtained from Guaymas sediments (Phelps et al, 1996), which contained phylotypes that affiliate with members of the Desulfobacterium anilini and Desulfobacter clusters (Phelps et al, 1998); one of these Desulfobacterium phylotypes (SB-21) is possibly involved in benzene activation (Oka et al, 2008). Although benzoate was detected as an intermediate in this enrichment culture, the source of the carboxyl group remains unidentified (Phelps et al, 2001).…”

Section: High-temperature Hydrocarbon Oxidationmentioning

confidence: 99%

Biosphere frontiers of subsurface life in the sedimented hydrothermal system of Guaymas Basin

2014

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Temperature is one of the key constraints on the spatial extent, physiological and phylogenetic diversity, and biogeochemical function of subsurface life. A model system to explore these interrelationships should offer a suitable range of geochemical regimes, carbon substrates and temperature gradients under which microbial life can generate energy and sustain itself. In this theory and hypothesis article, we make the case for the hydrothermally heated sediments of Guaymas Basin in the Gulf of California as a suitable model system where extensive temperature and geochemical gradients create distinct niches for active microbial populations in the hydrothermally influenced sedimentary subsurface that in turn intercept and process hydrothermally generated carbon sources. We synthesize the evidence for high-temperature microbial methane cycling and sulfate reduction at Guaymas Basin – with an eye on sulfate-dependent oxidation of abundant alkanes – and demonstrate the energetic feasibility of these latter types of deep subsurface life in previously drilled Guaymas Basin locations of Deep-Sea Drilling Project 64.

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Section: High-temperature Hydrocarbon Oxidationmentioning

confidence: 99%

Biosphere frontiers of subsurface life in the sedimented hydrothermal system of Guaymas Basin

2014

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“…Benzene mineralization to carbon dioxide has been reported under methanogenic (Grbic-Galic and Vogel, 1987;Kazumi et al, 1997;Weiner and Lovley, 1998), sulphidogenic (Edwards and Grbic-Galic, 1992;Lovley et al, 1995;Phelps et al, 1996;Kazumi et al, 1997), iron-reducing (Lovley et al, 1994;Kazumi et al, 1997;Anderson et al, 1998) and nitrate-reducing (Major et al, 1988;Burland and Edwards, 1999) conditions. Although uncommon, benzene mineralization has recently been demonstrated by several groups of researchers.…”

Section: Introductionmentioning

confidence: 99%

Use of stable isotopes to identify benzoate as a metabolite of benzene degradation in a sulphidogenic consortium

Phelps

Zhang

Young

2001

Environmental Microbiology

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An enriched sulphidogenic consortium capable of mineralizing benzene was used to study the metabolic pathway of anaerobic benzene degradation. Benzoate was detected in active cultures and benzene was confirmed to be the source of this benzoate by the addition of deuterated benzene (D6) and subsequent detection of deuterated benzoate (D5) in active cultures but not in autoclaved controls. Benzoate was utilized by this culture at 1/12 the rate of benzene, while its presence did not inhibit benzene utilization. The benzene utilization rate was reduced, however, in the presence of 2-fluorobenzoate. When the culture was supplemented with [(13)C]-bicarbonate, the carboxyl group on benzoate was not labelled with [(13)C]-carbon, suggesting that this transformation relies on a more complex set of reactions than simple addition of carbonate.

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“…Dentre as três espécies químicas em estudo, o benzeno costuma ser considerado o mais resistente frente aos processos de remediação convencionais 28 . Por este motivo foi utilizado como substrato modelo em todos os estudos preliminares de otimização e caracterização dos processos oxidativos propostos neste trabalho.…”

Section: Resultados E Discussão Degradação Fotoquímica De Benzenounclassified

Degradação de BTXs via processos oxidativos avançados

Tiburtius¹,

Peralta‐Zamora²,

Emmel³

et al. 2005

Quím. Nova

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Recebido em 26/2/04; aceito em 30/7/04; publicado na web em 12/11/04 DEGRADATION OF BTXs BY ADVANCED OXIDATIVE PROCESSES. In this study the efficiency of advanced oxidative processes (AOPs) were investigated toward the degradation of aqueous solutions containing benzene, toluene and xylenes (BTX). The results indicated that BTX can be effectively oxidized by the UV-A-assisted photo-Fenton process. The treatment permits almost total degradation of BTX and removal of more than 80% of the phenolyc intermediates at reaction times of about 30 min. Preliminary investigations using solar light suggest a good potentiality of the process for the treatment of large volumes of aqueous samples containing these polluting species.Keywords: BTXs; advanced oxidation processes; remediation. INTRODUÇÃOA contaminação de solos e águas subterrâneas por compostos orgânicos voláteis tem sido destaque nas últimas décadas, principalmente em função da freqüência com que episódios de contaminação são verificados e da gravidade com que o meio ambiente é afetado. Embora os grandes vazamentos acidentais de petróleo sejam preocupantes e ocupem grande espaço na mídia, estima-se que a principal fonte de contaminação por estas espécies seja devida a pequenos e contínuos vazamentos de combustível em postos de distribuição 1 , favorecidos pelo envelhecimento dos taques de estocagem.No Brasil existem cerca de 27.000 postos de combustíveis, muitos dos quais operando em condições de risco. Em razão deste fato, o potencial poluente desta atividade mostra-se bastante elevado, o que faz com que a contaminação de aqüíferos seja apenas uma questão de tempo 2 . A preocupação relacionada com o potencial de contaminação de águas subterrâneas vem crescendo em diversas cidades, principalmente São Paulo, Curitiba e Joinville. Estudos realizados pela prefeitura de Joinville em 65 postos da cidade revelaram que somente um dos postos examinados não apresentava problemas de vazamento que redundasse em contaminação do lençol freático 3 .O potencial poluente da gasolina está diretamente relacionado com os hidrocarbonetos aromáticos de maior solubilidade em água, isto é, benzeno, tolueno e xilenos (BTXs). Dentre estes, o benzeno mostrase especialmente tóxico, podendo provocar câncer quando em condições de exposição crônica, principalmente devido à absorção por via respiratória 4 . Além disso, a gasolina comercializada em nosso país é aditivada com cerca de 20 a 25% de etanol, fator que aumenta consideravelmente a solubilidade destes poluentes e, conseqüentemente, a sua migração em corpos d'água 5 . Adicionalmente, estudos recentes têm demonstrado que a biodegradação do etanol consome rapidamente todos os aceptores de elétrons disponíveis no meio, o que faz com que a biodegradação dos BTXs seja drasticamente afetada 6 . Em função destes antecedentes, a busca de novas alternativas para a remediação de águas contaminadas mostra-se absolutamente essencial.Nos últimos anos, os processos oxidativos avançados (POAs) têm aparecido como uma excelente alternativa para o tratame...

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Anaerobic degradation of benzene in BTX mixtures dependent on sulfate reduction

Cited by 67 publications

References 12 publications

Biosphere frontiers of subsurface life in the sedimented hydrothermal system of Guaymas Basin

Biosphere frontiers of subsurface life in the sedimented hydrothermal system of Guaymas Basin

Use of stable isotopes to identify benzoate as a metabolite of benzene degradation in a sulphidogenic consortium

Degradação de BTXs via processos oxidativos avançados

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