Biodegradation of Acetic, Benzoic, Isophthalic, Toluic and Terephthalic Acids Using a Mixed Culture: Effluents of PTA Production

Raj, C. B. Chidambara; Ramkumar, Nagarajan; Siraj, Abdul; Chidambaram, S.

doi:10.1205/095758297529129

Cited by 21 publications

(8 citation statements)

References 12 publications

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“…3) and transcripts. Indeed, waste streams from the polyester manufacturing process often contain dioxane and other aromatic compounds (23,51,52). Based on our pure culture results using toluene as the sole carbon source (see Fig.…”

Section: Discussionmentioning

confidence: 97%

Identification of Biomarker Genes To Predict Biodegradation of 1,4-Dioxane

Gedalanga

Pornwongthong

Mora³

et al. 2014

Appl Environ Microbiol

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Bacterial multicomponent monooxygenase gene targets in Pseudonocardia dioxanivorans CB1190 were evaluated for their use as biomarkers to identify the potential for 1,4-dioxane biodegradation in pure cultures and environmental samples. Our studies using laboratory pure cultures and industrial activated sludge samples suggest that the presence of genes associated with dioxane monooxygenase, propane monooxygenase, alcohol dehydrogenase, and aldehyde dehydrogenase are promising indicators of 1,4-dioxane biotransformation; however, gene abundance was insufficient to predict actual biodegradation. A time course gene expression analysis of dioxane and propane monooxygenases in Pseudonocardia dioxanivorans CB1190 and mixed communities in wastewater samples revealed important associations with the rates of 1,4-dioxane removal. In addition, transcripts of alcohol dehydrogenase and aldehyde dehydrogenase genes were upregulated during biodegradation, although only the aldehyde dehydrogenase was significantly correlated with 1,4-dioxane concentrations. Expression of the propane monooxygenase demonstrated a time-dependent relationship with 1,4-dioxane biodegradation in P. dioxanivorans CB1190, with increased expression occurring after over 50% of the 1,4-dioxane had been removed. While the fraction of P. dioxanivorans CB1190-like bacteria among the total bacterial population significantly increased with decrease in 1,4-dioxane concentrations in wastewater treatment samples undergoing active biodegradation, the abundance and expression of monooxygenase-based biomarkers were better predictors of 1,4-dioxane degradation than taxonomic 16S rRNA genes. This study illustrates that specific bacterial monooxygenase and dehydrogenase gene targets together can serve as effective biomarkers for 1,4-dioxane biodegradation in the environment.

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Section: Discussionmentioning

confidence: 97%

Identification of Biomarker Genes To Predict Biodegradation of 1,4-Dioxane

Gedalanga

Pornwongthong

Mora³

et al. 2014

Appl Environ Microbiol

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“…When some of the intermediates act as substrates to support biological growth, the biodegradability of the wastewater is enhanced. In an earlier study (Chidambara Raj et al, 1997), when 1,4-dioxane was present as the sole source of carbon, the solution was nonbiodegradable and addition of acetic acid rendered the solution biodegradable.…”

Section: Aot and Integration With Biological Processesmentioning

confidence: 95%

“…While a small (Gibson, 1984;Chidambara Raj et al, 1997), the presence of these compounds in effluent streams often causes problems in treatment plants because the inherent rate of biodegradation is low. These compounds are generally resistant to biodegradation in the environment; they can be termed recalcitrant or poorly biodegradable chemicals.…”

Section: Model Compoundsmentioning

confidence: 99%

EVALUATION OF UV/O₃AND UV/H₂O₂PROCESSES FOR NONBIODEGRADABLE COMPOUNDS: IMPLICATIONS FOR INTEGRATION WITH BIOLOGICAL PROCESSES FOR EFFLUENT TREATMENT

Quen

Raj

2006

Chemical Engineering Communications

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Poorly biodegradable compounds reduce the efficiency of biological effluent treatment processes. These are often encountered in pharmaceutical and speciality chemical industries. Advanced oxidation technologies (AOT) are appropriate for the conversion of such compounds into biodegradable entities. Tetrahydrofuran, 1,4-dioxane, and pyridine are heterocyclic compounds that are known to be recalcitrant and nonbiodegradable. AOT were investigated for the destruction of these model compounds. Two forms of AOT, UV-O 3 and UV-H 2 O 2 , were studied. UV-H 2 O 2 treatment resulted in higher biodegradability for tetrahydrofuran; UV-O 3 treatment resulted in higher biodegradability for 1,4-dioxane. For pyridine, neither treatment improved biodegradability. For efficient integration of AOT with biological processes for effluent treatment, it is necessary to evaluate the AOT with multiple objectives, such as level of destruction of target compound, level of reduction in COD, and enhancement of biodegradability. Due to the presence of multiple pollutants in real effluents and in AOT, kinetics of oxidation elucidated with single compounds is unlikely to be useful.

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“…1,4-Dioxane may be degraded microbially via metabolic or cometabolic reactions. Microbial degradation is carried out aerobically by mixed microbial communities in industrial sludge, 14,15 and 1,4-dioxane-degrading bacteria have been isolated. 16−19 Only a limited number of studies have examined microbial degradation of 1,4-dioxane under anaerobic conditions, and the degradation rates under nitrate-, iron-, and sulfate-reducing conditions are exceedingly slow.…”

Section: ■ Introductionmentioning

confidence: 99%

Microbially Driven Fenton Reaction for Degradation of the Widespread Environmental Contaminant 1,4-Dioxane

Sekar

DiChristina

2014

Environ. Sci. Technol.

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The carcinogenic cyclic ether compound 1,4-dioxane is employed as a stabilizer of chlorinated industrial solvents and is a widespread environmental contaminant in surface water and groundwater. In the present study, a microbially driven Fenton reaction was designed to autocatalytically generate hydroxyl (HO•) radicals that degrade 1,4-dioxane. In comparison to conventional (purely abiotic) Fenton reactions, the microbially driven Fenton reaction operated at circumneutral pH and did not the require addition of exogenous H2O2 or UV irradiation to regenerate Fe(II) as Fenton reagents. The 1,4-dioxane degradation process was driven by pure cultures of the Fe(III)-reducing facultative anaerobe Shewanella oneidensis manipulated under controlled laboratory conditions. S. oneidensis batch cultures were provided with lactate, Fe(III), and 1,4-dioxane and were exposed to alternating aerobic and anaerobic conditions. The microbially driven Fenton reaction completely degraded 1,4-dioxane (10 mM initial concentration) in 53 h with an optimal aerobic-anaerobic cycling period of 3 h. Acetate and oxalate were detected as transient intermediates during the microbially driven Fenton degradation of 1,4-dioxane, an indication that conventional and microbially driven Fenton degradation processes follow similar reaction pathways. The microbially driven Fenton reaction provides the foundation for development of alternative in situ remediation technologies to degrade environmental contaminants susceptible to attack by HO• radicals generated by the Fenton reaction.

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Biodegradation of Acetic, Benzoic, Isophthalic, Toluic and Terephthalic Acids Using a Mixed Culture: Effluents of PTA Production

Cited by 21 publications

References 12 publications

Identification of Biomarker Genes To Predict Biodegradation of 1,4-Dioxane

Identification of Biomarker Genes To Predict Biodegradation of 1,4-Dioxane

EVALUATION OF UV/O₃AND UV/H₂O₂PROCESSES FOR NONBIODEGRADABLE COMPOUNDS: IMPLICATIONS FOR INTEGRATION WITH BIOLOGICAL PROCESSES FOR EFFLUENT TREATMENT

Microbially Driven Fenton Reaction for Degradation of the Widespread Environmental Contaminant 1,4-Dioxane

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Biodegradation of Acetic, Benzoic, Isophthalic, Toluic and Terephthalic Acids Using a Mixed Culture: Effluents of PTA Production

Cited by 21 publications

References 12 publications

Identification of Biomarker Genes To Predict Biodegradation of 1,4-Dioxane

Identification of Biomarker Genes To Predict Biodegradation of 1,4-Dioxane

EVALUATION OF UV/O3AND UV/H2O2PROCESSES FOR NONBIODEGRADABLE COMPOUNDS: IMPLICATIONS FOR INTEGRATION WITH BIOLOGICAL PROCESSES FOR EFFLUENT TREATMENT

Microbially Driven Fenton Reaction for Degradation of the Widespread Environmental Contaminant 1,4-Dioxane

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Product

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EVALUATION OF UV/O₃AND UV/H₂O₂PROCESSES FOR NONBIODEGRADABLE COMPOUNDS: IMPLICATIONS FOR INTEGRATION WITH BIOLOGICAL PROCESSES FOR EFFLUENT TREATMENT