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Thavamani P.,University of South Australia | Thavamani P.,Cooperative Res Center For Contamination Assessment And Remediation Of The Environment Crc Care | Megharaj M.,University of South Australia | Megharaj M.,Cooperative Res Center For Contamination Assessment And Remediation Of The Environment Crc Care | And 2 more authors.
Biodegradation | Year: 2012

Bioremediation of polyaromatic hydrocarbons (PAH) contaminated soils in the presence of heavy metals have proved to be difficult and often challenging due to the ability of toxic metals to inhibit PAH degradation by bacteria. In this study, a mixed bacterial culture designated as consortium-5 was isolated from a former manufactured gas plant (MGP) site. The ability of this consortium to utilise HMW PAHs such as pyrene and BaP as a sole carbon source in the presence of toxic metal Cd was demonstrated. Furthermore, this consortium has proven to be effective in degradation of HMW PAHs even from the real long term contaminated MGP soil. Thus, the results of this study demonstrate the great potential of this consortium for field scale bioremediation of PAHs in long term mix contaminated soils such as MGP sites. To our knowledge this is the first study to isolate and characterize metal tolerant HMW PAH degrading bacterial consortium which shows great potential in bioremediation of mixed contaminated soils such as MGP. © 2012 Springer Science+Business Media B.V.


Sudharshan S.,University of South Australia | Sudharshan S.,Cooperative Res Center For Contamination Assessment And Remediation Of The Environment Crc Care | Naidu R.,University of South Australia | Naidu R.,Cooperative Res Center For Contamination Assessment And Remediation Of The Environment Crc Care | And 4 more authors.
Biodegradation | Year: 2012

Over the past few decades significant progress has been made in research on DDT degradation in the environment. This review is an update of some of the recent studies on the degradation and biodegradation pathways of DDT and its metabolites, particularly in soils. The latest reports on human toxicity shows that DDT intake is still occurring even in countries that banned its use decades ago. Ageing, sequestration and formation of toxic metabolites during the degradation processes pose environmental challenges and result in difficulties in bioremediation of DDT contaminated soils. Degradation enhancement strategies such as the addition of chelators, low molecular organic acids, co-solvent washing and the use of sodium and seaweeds as ameliorant have been studied to accelerate degradation. This review describes and discusses the recent challenges and degradation enhancement strategies for DDT degradation by potentially cost effective procedures based on bioremediation. © 2012 Springer Science+Business Media B.V.

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