Low surfactant concentration increases fungal mineralization of a polychlorinated biphenyl congener but has no effect on overall metabolism

Beaudette, Lee A.; Ward, Owen P.; Pickard, Michael A.; Fedorak, Phillip M.

doi:10.1046/j.1472-765x.2000.00700.x

Cited by 34 publications

(8 citation statements)

References 25 publications

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“…The properties of chemical surfactants which can influence their efficacy include the critical micelle concentration (cmc), the surfactant concentration at which surface tension reaches a minimum and surfactant monomers aggregate into micelles and the hydrophile-lipophile balance (HLB), a measure of surfactant lipophilicity. The cmc value is important because solubilization and biodegradation enhancement can be related both to surface tension and to the status of micelle development [4,6,7,14,21,35,56]. Surfactants with HLB values of 8-15 generally form oil-in-water emulsions, whereas surfactants with HLB values of 3-6 form water-in-oil emulsions [16].…”

Section: Hydrocarbon Accessionmentioning

confidence: 99%

Accelerated biodegradation of petroleum hydrocarbon waste

Ward

Singh

Hamme

2003

Journal of Industrial Microbiology and Biotechnology

162

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Conventional landfarming approaches to bioremediation of refinery and other petroleum sludges are not acceptable environmentally and are banned in most North American jurisdictions. While initial bioreactor-based systems for treatment of these sludges required batch-cycle process-times of 1-3 months, an accelerated process has now been developed which can be completed in 10-12 days. In this process, up to 99% of total petroleum hydrocarbons are degraded and the sludges are converted from hazardous to non-hazardous according to the United States EPA's toxicity characteristic leachate procedure criteria. Understanding and exploiting mechanisms to improve hydrocarbon accession to the degrading microorganisms was a key development component of the process. Contrasting physiological mechanisms were observed for different component organisms of the mixed culture with respect to their associations with the hydrocarbon substrate; and the beneficial effects of using surfactants were demonstrated. The mixed culture used in the process exhibited a capacity for high-rate degradation of volatile organic carbons and the potential use of the culture as a liquid biofilter was demonstrated. The culture was also effective as an inoculant for the bioaugmentation of total petroleum hydrocarbon-contaminated soil and as a de-emulsifier of oilfield emulsions and could transform some other environmental contaminants which are not predominant components of crude oil.

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Section: Hydrocarbon Accessionmentioning

confidence: 99%

Accelerated biodegradation of petroleum hydrocarbon waste

Ward

Singh

Hamme

2003

Journal of Industrial Microbiology and Biotechnology

162

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“…Methods for biodegradation of pollutants using microorganisms was not used to the contaminated soil exported to landfills of hazardous waste. Many research and industrial experience show that introducing the microorganisms to the contaminated medium considerably accelerates the time of pollutants biodegradation, even those considered permanently lingering in the environment (Beaudette et al 2000;Piekarska 2003;Kamanavalli and Ninnekar 2004;Fang et al 2010;Ghosh et al 2010;Ortega et al 2011;Baczyński 2012).…”

Section: The National Program Elimination Of Landfills Containing Obsmentioning

confidence: 99%

The National Program for the Liquidation of Pesticide Waste Landfills, Successes and Unused Opportunities – Case Study From Poland

Błaszak¹,

Ochmian²

2018

Folia Pomer. Univ. Technol. Stetin., Agric., Aliment., Pisc., Z

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Previous generations (50-70's of the last century) left behind thousands of tons of toxic agrochemical waste (produced and stored for stock). Some of them have already been liquidated, but some have remained, because the costs of liquidation are enormous. In 2011, the national program for the liquidation of pesticide waste landfills ended (pesticide burial grounds with various chemicals types, organochlorine pesticides such as DDT, lindane, toxaphene, methoxychlor, heptachlor, α-HCH, β-HCH and phosphoroorganic pesticides, carbamate insecticides, dinitrophenols, phenoxyacids). The necessity of liquidation about 240 pesticide burial grounds (approx. 20 000 Mg obsolete pesticides) located throughout the country resulted from the obligations of Poland ratifying in 2008 the provisions of the Stockholm Convention on Persistent Organic Pollutions. The preparations and packaging were taken to the operated hazardous waste incineration plants. Debris and soil adjacent to the burial grounds were placed in hazardous waste landfills. After 6 years since the end of the national program for the decommission of burials, it is time for summarizing. Due to the fact that similar objects can be found in many countries around the world, analysis of the Polish case may be useful. The publication focuses not on the methods of utilization and statistical data, but on a critical look at the applied solutions, also presenting alternative solutions (mainly in situ and ex situ bioremediation), instead of storage.

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“…However, only a few PCB degradation studies were performed in soil systems. Lower concentration of surfactants increased fungal mineralization of PCB congeners (Beaudette et al 2000). The ability of fungi to degrade low PCB concentrations has been demonstrated for several strains (Kamei et al.…”

Section: White Rot Fungi As An Attractive Candidate For Bioremediatiomentioning

confidence: 99%

Advances and perspective in bioremediation of polychlorinated biphenyl-contaminated soils

Sharma

Gautam

Nanekar

et al. 2017

Environ Sci Pollut Res

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In recent years, microbial degradation and bioremediation approaches of polychlorinated biphenyls (PCBs) have been studied extensively considering their toxicity, carcinogenicity and persistency potential in the environment. In this direction, different catabolic enzymes have been identified and reported for biodegradation of different PCB congeners along with optimization of biological processes. A genome analysis of PCB-degrading bacteria has led in an improved understanding of their metabolic potential and adaptation to stressful conditions. However, many stones in this area are left unturned. For example, the role and diversity of uncultivable microbes in PCB degradation are still not fully understood. Improved knowledge and understanding on this front will open up new avenues for improved bioremediation technologies which will bring economic, environmental and societal benefits. This article highlights on recent advances in bioremediation of PCBs in soil. It is demonstrated that bioremediation is the most effective and innovative technology which includes biostimulation, bioaugmentation, phytoremediation and rhizoremediation and acts as a model solution for pollution abatement. More recently, transgenic plants and genetically modified microorganisms have proved to be revolutionary in the bioremediation of PCBs. Additionally, other important aspects such as pretreatment using chemical/physical agents for enhanced biodegradation are also addressed. Efforts have been made to identify challenges, research gaps and necessary approaches which in future, can be harnessed for successful use of bioremediation under field conditions. Emphases have been given on the quality/efficiency of bioremediation technology and its related cost which determines its ultimate acceptability.

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Low surfactant concentration increases fungal mineralization of a polychlorinated biphenyl congener but has no effect on overall metabolism

Cited by 34 publications

References 25 publications

Accelerated biodegradation of petroleum hydrocarbon waste

Accelerated biodegradation of petroleum hydrocarbon waste

The National Program for the Liquidation of Pesticide Waste Landfills, Successes and Unused Opportunities – Case Study From Poland

Advances and perspective in bioremediation of polychlorinated biphenyl-contaminated soils

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