Biotreatment of groundwater contaminated with MTBE: interaction of common environmental co-contaminants

Wang, Xiaolin; Deshusses, Marc A.

doi:10.1007/s10532-005-9034-6

Cited by 26 publications

(17 citation statements)

References 11 publications

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“…The presence of the eth genes in the Rhodococcus strains with fuel ether degradation capacities that are cited above was not detected with R. wratislaviensis IFP 2016. The simultaneous presences of BTEXs and MTBE had a negative impact on the MTBE degradation rate (nearly fivefold lower) as previously reported (12,27,40,47), whereas no negative effect was shown on strain UC1, a strain closely related to the well-known Methylibium petroleiphilum PM1 (39). The negative effect of the presence of BTEXs on MTBE biodegradation has consequences for the environmental fate of MTBE in contaminated aquifers.…”

Section: Discussionsupporting

confidence: 69%

Degradation of a Mixture of Hydrocarbons, Gasoline, and Diesel Oil Additives by Rhodococcus aetherivorans and Rhodococcus wratislaviensis

Auffret

Labbé

Thouand

et al. 2009

Appl Environ Microbiol

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Section: Discussionsupporting

confidence: 69%

Degradation of a Mixture of Hydrocarbons, Gasoline, and Diesel Oil Additives by Rhodococcus aetherivorans and Rhodococcus wratislaviensis

Auffret

Labbé

Thouand

et al. 2009

Appl Environ Microbiol

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“…On the other hand, MTBE bioremoval was severely inhibited in the presence of ethylbenzene and xylenes using PM1 culture enriched from a compost biofilter [8]. Similar results were obtained where the removal efficiency for MTBE was strongly inhibited by toluene and xylene [9].…”

Section: Introductionsupporting

confidence: 76%

Combined Removal of an MTBE and BTEX Mixture Using Indigenous Microbe Immobilized on Waste Silica Gel

Xie¹,

Lu²,

Toledo³

et al. 2016

IJESD

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Abstract-The immobilization system utilizing waste silica gel as matrix was employed for the simultaneous removal of a mixture of BTEX (benzene, toluene, ethylbenzene, o,m,p-xylene) and methyl tert-butyl ether (MTBE) from an artificially contaminated water. Pure culture utilizing BTEX as growth substrate while co-metabolizing MTBE was enriched and isolated from the activated sludge sample collected from a regional wastewater treatment plant in Macau SAR, China. The comparison between suspended and immobilized systems was studied to determine the enhanced removal of these contaminants. In immobilized system with 50 mg/L BTEX and 100 mg/L MTBE, toluene, benzene, ethylbenzene, and m,p-xylene were completely removed while the removal efficiencies of 98.5 ± 1.7% and 81.3±2.2% were obtained for o-xylene and MTBE, respectively. The adsorption kinetics of contaminants on silica gel was also evaluated and the adsorption capacity followed the order of o-xylene>p-xylene>m-xylene>ethylbenzene>benzene>toluene> MTBE. Results from this study suggested that waste silica gel could be a promising waste material for the simultaneous adsorption and bioremoval of BTEX and MTBE from contaminated groundwater.

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“…Several different substrate interactions have been observed in various studies on biodegradation of BTEX combinations by pure as well as mixed cultures (Arvin et al, 1989;Barbaro et al, 1992;Wang and Deshusses, 2007;Jo et al, 2008). The differences in the substrate interactions are mainly due to catabolic diversity of microbes in different environmental conditions.…”

Section: Substrate Interactions Among Btex During Anaerobic Degradationmentioning

confidence: 99%

“…Successful PRBB application for a mixture of contaminants is often influenced by many different substrate interactions such as synergistic or antagonistic among individual contaminants in the mixture (Arvin et al, 1989;Barbaro et al, 1992;Wang and Deshusses, 2007). Synergistic interactions promote the degradation rates of individual contaminants while the antagonistic interactions reduce the degradation rates through various inhibition processes.…”

Section: Research Problem Statementmentioning

confidence: 99%

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In situ Groundwater Remediation Using Enricher Reactor – Permeable Reactive Biobarrier

Kasi¹,

McEvoy²,

Padmanabhan³

et al. 2010

proc water environ fed

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Permeable reactive biobarrier (PRBB) is a flow-through zone where microorganisms degrade contaminants in groundwater. Discontinuous presence of contaminants in groundwater causes performance loss of a PRBB in removing the target contaminant. A novel enricher reactor (ER) -PRBB system was developed to treat groundwater with contaminants that reappear after an absence period. ER is an offline reactor for enriching contaminant degraders, which were used for augmenting PRBB to maintain its performance after a period of contaminant absence. The ER-PRBB concept was initially applied to remove benzene that reappeared after absence periods of 10 and 25 days. PRBBs without ER augmentation experienced performance losses of up to 15% higher than ER-PRBBs.The role of inducer compounds in the ER to enrich bacteria that can degrade a mixture of benzene, toluene, ethylbenzene, and xylene (BTEX) was investigated with an objective to minimize the use of toxic chemicals as inducers. Three inducer types were studied: individual BTEX compounds, BTEX mixture, and benzoate (a non toxic and a common intermediate for BTEX biodegradation). Complete BTEX removal was observed for degraders enriched on all three inducer types; however, the removal rates were dependent on the inducer type. Degraders enriched on toluene and BTEX had the highest degradation rates for BTEX of 0.006 to 0.014 day -1 and 0.006 to 0.012 day -1 , respectively, while degraders enriched on benzoate showed the lowest degradation rates of 0.004 to 0.009 day -1 .The ER-PRBB technique was finally applied to address the performance loss of a PRBB due to inhibition interactions among BTEX, when the mixture reappeared after a iv 10 day absence period. The ER-PRBBs experienced minimal to no performance loss, while PRBBs without ER augmentation experienced performance losses between 11% and 35%. Presence of ethanol during the BTEX absence period increased the performance loss of PRBB for benzene removal. PRBBs augmented with degraders enriched on toluene alone overcame the inhibition interaction between benzene and toluene indicating that toluene can be used as a single effective inducer in an ER. The ER-PRBB was demonstrated to be a promising remediation technique and has potential for applications to a wide range of organic contaminants.v ACKNOWLEDGEMENTS

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Biotreatment of groundwater contaminated with MTBE: interaction of common environmental co-contaminants

Cited by 26 publications

References 11 publications

Degradation of a Mixture of Hydrocarbons, Gasoline, and Diesel Oil Additives by Rhodococcus aetherivorans and Rhodococcus wratislaviensis

Degradation of a Mixture of Hydrocarbons, Gasoline, and Diesel Oil Additives by Rhodococcus aetherivorans and Rhodococcus wratislaviensis

Combined Removal of an MTBE and BTEX Mixture Using Indigenous Microbe Immobilized on Waste Silica Gel

In situ Groundwater Remediation Using Enricher Reactor – Permeable Reactive Biobarrier

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