Biodegradation of dispersed diesel fuel under high salinity conditions

Liu, Yang; Lai, Ching-Ting; Shieh, Wen K.

doi:10.1016/s0043-1354(00)00072-5

Cited by 48 publications

(21 citation statements)

References 8 publications

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“…Consequently, the biofilter must provide the conditions capable of maintaining a microbial population which can support these ambitious objectives. Biofilter microbial activity needs to be able to operate at gas flow rates of around 1 to 2 liters of gas per liter of biofilter capacity per min and degrade around 1 to 2 kg of volatile organic carbons per 1,000 liters of biofilter capacity per day (0.1 to 0.2% per day), which is only a little less than the performance quoted for optimized accelerated petroleum waste bioreactors (676). Volatile organic carbon biofilters have to be very efficient high-density microbial systems capable of high rates of volatile organic carbon transformation.…”

Section: Biofiltration Of Volatile Organic Compoundsmentioning

confidence: 99%

Recent Advances in Petroleum Microbiology

Hamme¹,

Singh

Ward

2003

Microbiol Mol Biol Rev

1,203

640

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Recent advances in molecular biology have extended our understanding of the metabolic processes related to microbial transformation of petroleum hydrocarbons. The physiological responses of microorganisms to the presence of hydrocarbons, including cell surface alterations and adaptive mechanisms for uptake and efflux of these substrates, have been characterized. New molecular techniques have enhanced our ability to investigate the dynamics of microbial communities in petroleum-impacted ecosystems. By establishing conditions which maximize rates and extents of microbial growth, hydrocarbon access, and transformation, highly accelerated and bioreactor-based petroleum waste degradation processes have been implemented. Biofilters capable of removing and biodegrading volatile petroleum contaminants in air streams with short substrate-microbe contact times (<60 s) are being used effectively. Microbes are being injected into partially spent petroleum reservoirs to enhance oil recovery. However, these microbial processes have not exhibited consistent and effective performance, primarily because of our inability to control conditions in the subsurface environment. Microbes may be exploited to break stable oilfield emulsions to produce pipeline quality oil. There is interest in replacing physical oil desulfurization processes with biodesulfurization methods through promotion of selective sulfur removal without degradation of associated carbon moieties. However, since microbes require an environment containing some water, a two-phase oil-water system must be established to optimize contact between the microbes and the hydrocarbon, and such an emulsion is not easily created with viscous crude oil. This challenge may be circumvented by application of the technology to more refined gasoline and diesel substrates, where aqueous-hydrocarbon emulsions are more easily generated. Molecular approaches are being used to broaden the substrate specificity and increase the rates and extents of desulfurization. Bacterial processes are being commercialized for removal of H2S and sulfoxides from petrochemical waste streams. Microbes also have potential for use in removal of nitrogen from crude oil leading to reduced nitric oxide emissions provided that technical problems similar to those experienced in biodesulfurization can be solved. Enzymes are being exploited to produce added-value products from petroleum substrates, and bacterial biosensors are being used to analyze petroleum-contaminated environments

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Section: Biofiltration Of Volatile Organic Compoundsmentioning

confidence: 99%

Recent Advances in Petroleum Microbiology

Hamme¹,

Singh

Ward

2003

Microbiol Mol Biol Rev

1,203

640

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“…However, after long exposition times, degradation can be observed and the amount of metabolized hydrocarbons increases in saline environments [Kleinsteuber et al, 2006;Riis et al, 2003], suggesting an adaptation of the microbial consortia to high salt concentrations [Kleinsteuber et al, 2006]. Nevertheless, there are reports in which the hydrocarbon biodegradation was not affected in a wide salinity range [Kerr and Capone, 1988], while other reports claim that a salinity increase enhanced the hydrocarbon degradation [Diaz et al, 2000;Yang et al, 2000]. This diversity of results shows the complexity of microbial communities and the specificity of the polluted sites.…”

Section: Petroleum Hydrocarbonsmentioning

confidence: 99%

Biodegradation of Organic Pollutants by Halophilic Bacteria and Archaea

Borgne¹,

2008

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Hypersaline environments are important for both surface extension and ecological significance. As all other ecosystems, they are impacted by pollution. However, little information is available on the biodegradation of organic pollutants by halophilic microorganisms in such environments. In addition, it is estimated that 5% of industrial effluents are saline and hypersaline. Conventional nonextremophilic microorganisms are unable to efficiently perform the removal of organic pollutants at high salt concentrations. Halophilic microorganisms are metabolically different and are adapted to extreme salinity; these microorganisms are good candidates for the bioremediation of hypersaline environments and treatment of saline effluents. This literature survey indicates that both the moderately halophilic bacteria and the extremely halophilic archaea have a broader catabolic versatility and capability than previously thought. A diversity of contaminating compounds is susceptible to be degraded by halotolerant and halophile bacteria. Nevertheless, significant research efforts are still necessary in order to estimate the true potential of these microorganisms to be applied in environmental processes and in the remediation of contaminated hypersaline ecosystems. This effort should be also focused on basic research to understand the overall degradation mechanism, to identify the enzymes involved in the degradation process and the metabolism regulation.

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“…Implementation of kinetic mathematical models in dimensioning and process simulation of bioreactors (for example: aerated submerged fixed-bed biofilm reactors -ASFBBR), requires knowledge of the carbonaceous material fractions in wastewater influent. In the available literature, there are examples indicating susceptibility of petrochemical wastewater to biological degradation (Acuna-Askar et al, 2000;Johnson et al, 2000;Lazarova et al, 2000;Park et al 1996;Schlegel and Teichgraber 2000;Trojanowicz and Dusza, 2003;Yang et al, 2000). However, the content of the biodegradable fraction of organic contaminants in petrochemical wastewater can depend on the technological outline of the particular oil-refinery and also whether it is analyzed as raw wastewater or wastewater pretreated with physical and chemical unit processes.…”

Section: Introductionmentioning

confidence: 99%

Carbonaceous materials in petrochemical wastewater before and after treatment in an aerated submerged fixed-bed biofilm reactor

Trojanowicz

Wójcik

2016

Chemical and Process Engineering

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Results of the studies for determining fractions of organic contaminants in a pretreated petrochemical wastewater flowing into a pilot Aerated Submerged Fixed-Bed Biofilm Reactor (ASFBBR) are presented and discussed. The method of chemical oxygen demand (COD) fractionation consisted of physical tests and biological assays. It was found that the main part of the total COD in the petrochemical, pretreated wastewater was soluble organic substance with average value of 57.6%. The fractions of particulate and colloidal organic matter were found to be 31.8% and 10.6%, respectively. About 40% of COD in the influent was determined as readily biodegradable COD. The inert fraction of the soluble organic matter in the petrochemical wastewater constituted about 60% of the influent colloidal and soluble COD. Determination of degree of hydrolysis (D H ) of the colloidal fraction of COD was also included in the paper. The estimated value of D H was about 62%. Values of the assayed COD fractions were compared with the same parameters obtained for municipal wastewater by other authors.

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Biodegradation of dispersed diesel fuel under high salinity conditions

Cited by 48 publications

References 8 publications

Recent Advances in Petroleum Microbiology

Recent Advances in Petroleum Microbiology

Biodegradation of Organic Pollutants by Halophilic Bacteria and Archaea

Carbonaceous materials in petrochemical wastewater before and after treatment in an aerated submerged fixed-bed biofilm reactor

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