A strategy for aromatic hydrocarbon bioremediation under anaerobic conditions and the impacts of ethanol: A microcosm study

Chen, Yu Dao; Barker, James; Gui, Lai

doi:10.1016/j.jconhyd.2007.09.006

Cited by 56 publications

(26 citation statements)

References 38 publications

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“…Remediation of petroleum hydrocarbon contaminated sites typically requires nitrogen, phosphorus. Chen et al (2008a) have reported that addition of excess ferric iron combined with limited nitrate could promote the in situ bioremediation of benzene, toluene, ethylbenzene and xylene isomers and trimethylbenzene isomers in the Borden aquifer and possibly for other sites contaminated by hydrocarbons. Zhou et al (2009) have investigated the effect of phosphorus concentration on PAH dissipation in the rhizosphere of mycorrhizal plants in a pot experiment using two plant species, alfalfa (Medicago sativa) and tall fescue (Festuca arundinacea), The major finding was the significant positive impact of mycorrhizal plants on the dissipation of high molecular weight PAH in highwater low-phosphorus treatment.…”

Section: Nutrient Availabilitymentioning

confidence: 99%

A comprehensive overview of elements in bioremediation

Juwarkar

Singh

Mudhoo

2010

Rev Environ Sci Biotechnol

301

128

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Sustainable development requires the development and promotion of environmental management and a constant search for green technologies to treat a wide range of aquatic and terrestrial habitats contaminated by increasing anthropogenic activities. Bioremediation is an increasingly popular alternative to conventional methods for treating waste compounds and media with the possibility to degrade contaminants using natural microbial activity mediated by different consortia of microbial strains. Many studies about bioremediation have been reported and the scientific literature has revealed the progressive emergence of various bioremediation techniques. In this review, we discuss the various in situ and ex situ bioremediation techniques and elaborate on the anaerobic digestion technology, phytoremediation, hyperaccumulation, composting and biosorption for their effectiveness in the biotreatment, stabilization and eventually overall remediation of contaminated strata and environments. The review ends with a note on the recent advances genetic engineering and nanotechnology have had in improving bioremediation. Case studies have also been extensively revisited to support the discussions on biosorption of heavy metals, gene probes used in molecular diagnostics, bioremediation studies of contaminants in vadose soils, bioremediation of oil contaminated soils, bioremediation of contaminants from mining sites, air sparging, slurry phase bioremediation, phytoremediation studies for pollutants and heavy metal hyperaccumulators, and vermicomposting.

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Section: Nutrient Availabilitymentioning

confidence: 99%

A comprehensive overview of elements in bioremediation

Juwarkar

Singh

Mudhoo

2010

Rev Environ Sci Biotechnol

301

128

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“…To characterize the subsurface flow and transport parameters, several types of information derived from tracer experiments have been shown to be useful. These include travel-time distribution at transects perpendicular to the mean groundwater flow direction (Christensen et al 2000; Cozzarelli et al 2010; Lovley and Lonergan 1990; Rabus et al 1993; Ruiz-Aguilar et al 2002), travel time based on peak concentration (Cozzarelli et al 2010; Lovley and Lonergan 1990), groundwater-flow velocity (Chen et al 2008; Vanderborght et al 2005), temporal moments of breakthrough curves BTC; (Barth and Hill 2005a, b; Mehl and Hill 2001), and mass discharge (Englert et al 2009; Harvey and Gorelick 1995). Harvey and Gorelick (1995) used time values at which different portions of total mass passed a sampler (arrival time quantile) as observations to estimate the spatial pattern of aquifer hydraulic conductivity of a hypothetical aquifer.…”

Section: Introductionmentioning

confidence: 99%

Effect of different transport observations on inverse modeling results: case study of a long-term groundwater tracer test monitored at high resolution

et al. 2013

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Conservative tracer experiments can provide information useful for characterizing various subsurface transport properties. This study examines the effectiveness of three different types of transport observations for sensitivity analysis and parameter estimation of a three-dimensional site-specific groundwater flow and transport model: conservative tracer breakthrough curves (BTCs), first temporal moments of BTCs (m1), and tracer cumulative mass discharge (Md) through control planes combined with hydraulic head observations (h). High-resolution data obtained from a 410-day controlled field experiment at Vandenberg Air Force Base, California (USA), have been used. In this experiment, bromide was injected to create two adjacent plumes monitored at six different transects (perpendicular to groundwater flow) with a total of 162 monitoring wells. A total of 133 different observations of transient hydraulic head, 1,158 of BTC concentration, 23 of first moment, and 36 of mass discharge were used for sensitivity analysis and parameter estimation of nine flow and transport parameters. The importance of each group of transport observations in estimating these parameters was evaluated using sensitivity analysis, and five out of nine parameters were calibrated against these data. Results showed the advantages of using temporal moment of conservative tracer BTCs and mass discharge as observations for inverse modeling.

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“…Further, it has also been reported that addition of ethanol can stimulate metabolism for denitrifying bacteria which become enriched after the application of this compound, and consequently resulting in anaerobic hydrocarbon biodegradation (Chen et al 2008). The results seem indicate that the low ethanol concentration used in these experiments could have enhanced the metabolic activity of some microbial groups including anaerobic microorganisms such as denitrifying or sulphate-reducing bacteria.…”

Section: Resultsmentioning

confidence: 62%

Treatment of diesel-polluted clay soil employing combined biostimulation in microcosms

Silva-Castro

SantaCruz-Calvo

Uad

et al. 2012

Int. J. Environ. Sci. Technol.

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The efficiency of inorganic fertilizers as stimulating agents for the bioremediation of oil-polluted environments can be increased with the addition of selected biostimulating compounds. In this study, the efficacy of different biostimulation treatments in the remediation of diesel-polluted soil in purpose-built microcosms has been evaluated. The treatments involved combinations of inorganic fertilizer with (a) Ivey surfactant, (b) Biorem organic fertilizer and (c) ethanol. Microbial activity was evaluated by monitoring the growth of heterotrophic and degrading bacteria and their dehydrogenase activity and carbon dioxide production. Hydrocarbon degradation was monitored by gas chromatography/mass spectrometry. The results showed that all treatments enhanced microbial activity in comparison with natural attenuation and also that the combined treatments generally enhanced hydrocarbon biodegradation in comparison to both natural attenuation and the single inorganic fertilizer treatment. The inorganic fertilizer plus Ivey Ò surfactant was the most efficient treatment in terms of Total Petroleum Hydrocarbon and light and heavy n-alkanes, showing an index of degradation of 1.4 and 1.3, respectively. Furthermore, biodegradation of heavy and branched n-alkanes was higher in microcosms treated with inorganic fertilizer plus ethanol (Index of degradation values of 1.6 and 1.5, respectively) indicating that combined treatments can be very effective in restoration of contaminated soil.

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A strategy for aromatic hydrocarbon bioremediation under anaerobic conditions and the impacts of ethanol: A microcosm study

Cited by 56 publications

References 38 publications

A comprehensive overview of elements in bioremediation

A comprehensive overview of elements in bioremediation

Effect of different transport observations on inverse modeling results: case study of a long-term groundwater tracer test monitored at high resolution

Treatment of diesel-polluted clay soil employing combined biostimulation in microcosms

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