Bioremediation of hydrocarbon-contaminated Polar soils. Extremophiles 10: 171-179
ABSTRACT Bioremediation is increasingly viewed as an appropriate remediation technology for hydrocarbon-contaminated polar soils. As for all soils, the successful application of bioremediation depends on appropriate biodegradative microbes and environmental conditions in situ. Laboratory studies have confirmed that hydrocarbon-degrading bacteria typically assigned to the genera Rhodococcus, Sphingomonas or Pseudomonas are present in contaminated polar soils. However, as indicated by the persistence of spilled hydrocarbons, environmental conditions in situ are suboptimal for biodegradation in polar soils. Therefore, it is likely that ex situ bioremediation will be the method of choice for ameliorating and controlling the factors limiting microbial activity, i.e. low and fluctuating soil temperatures, low levels of nutrients, and possible alkalinity and low moisture. Care must be taken when adding nutrients to the coarse-textured, low-moisture soils prevalent in continental Antarctica and the high Arctic because excess levels can inhibit hydrocarbon biodegradation by decreasing soil water potentials. Bioremediation experiments conducted on site in the Arctic indicate that land farming and biopiles may be useful approaches for bioremediation of polar soils.
- SourceAvailable from: Alexandra B. Ribeiro
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- "Nevertheless, excess of nutrients could also reduce microbial activity and loss of hydrocarbons (e.g., Braddock et al. 1997). Despite bioremediation of PHC by indigenous coldadapted microorganisms being reported at low temperatures (Aislabie et al. 2006; Rike et al. 2003), they also persist in contaminated soils (Aislabie et al. 2004). Temperature from 1 to above 10 °C (e.g., Chang et al. 2010; Chang et al. 2011; Delille et al. 2007; Ferguson et al. 2008) increased degradation and/or its ratio. "
ABSTRACT: A 168-day period field study, carried out in Sisimiut, Greenland, assessed the potential to enhance soil remediation with the surplus heating from an incineration facility. This approach searches a feasible ex situ remediation process that could be extended throughout the year with low costs. Individual and synergistic effects of biostimulation were also tested, in parallel. An interim evaluation at the end of the first 42 days showed that biostimulation and active heating, as separate treatments, enhanced petroleum hydrocarbon (PHC) removal compared to natural attenuation. The coupling of both technologies was even more effective, corroborating the benefits of both techniques in a remediation strategy. However, between day 42 and day 168, there was an opposite remediation trend with all treatments suggesting a stabilization except for natural attenuation, where PHC values continued to decrease. This enforces the "self-purification" capacity of the system, even at low temperatures. Coupling biostimulation with active heating was the best approach for PHC removal, namely for a short period of time (42 days). The proposed remediation scheme can be considered a reliable option for faster PHC removal with low maintenance and using "waste heating" from an incineration facility.Environmental Science and Pollution Research 02/2014; DOI:10.1007/s11356-013-2466-3 · 2.76 Impact Factor
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- "ere found to make up only a minor component of control soils ( Saul et al . 2005 ) . These responses are similar to those observed in hydrocarbon contaminated soils of temperate regions ( Aislabie et al . 2006a ) . The breakdown of hydrocarbons in Antarctic soils is extremely slow as biodegradation is largely restricted to the warm summer months ( Aislabie et al . 2006a ) . Shifts in bacterial community structure may also be induced through physical disturbance of soils . Soils around permanent bases can be intensely disrupted by building and heavy equipment use ( Kennicutt et al . 2010 ) , while environmentally sensitive regions can be impacted by foot traffic ( Ayres et al . 2008 ) . Trampling has be"
ABSTRACT: Antarctica's ice-free environments span diverse habitats, ranging from well developed and nutrient rich soils in the coastal areas, to poorly developed and oligotrophic soils in the continent's deserts and high elevation sites. Though most terrestrial environments in Antarctica are typified by harsh environmental condi-tions, many soils are home to abundant and diverse bacterial communities. These communities are locally adapted, varying both between and within different regions of the continent, and typically reflecting the local physicochemical and biological characteristics of the soils. Environmental conditions are changing rapidly in many areas, due to increased human activity on the continent and the impacts of climate change. This chapter reviews characteristics of bacterial communities in soils across Antarctica in relation to their environment, and dis-cusses the potential responses of bacterial communities to contemporary envi-ronmental change. Continued and coordinated efforts to understand bacterial community structure and function in Antarctic soils will be necessary to monitor and predict ecological responses in these changing environments, and to shape management practices that will ensure the protection and preservation of biodi-versity in Antarctica's terrestrial ecosystems. 2.1 Introduction While the majority of continental Antarctica is permanently covered by the Ant-arctic Ice Sheet, approximately 0.35 % of the continent remains free from ice and snow cover for part or all of the year (Hopkins et al. 2006b). These ice-free areas are largely confined to the perimeter of the continent at coastal sites and regions cut offAntarctic Terrestrial Microbiology: Physical and biological properties of Antarctic soils, Edited by Don A Cowan, 01/2014: pages 9-33; Springer-Verlag, Berlin..
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- "It is assumed that cold-adapted hydrocarbon degraders are adapted to grow and thrive under these adverse conditions (Margesin & Schinner, 2001). Laboratory studies have confirmed that hydrocarbon-degrading bacteria typically assigned to the genera Rhodococcus, Sphingomonas or Pseudomonas are present in contaminated polar soils (Aislabie et al., 2006). Some representatives of fungi in Antarctic areas are mesophilic species present as spores. "
ABSTRACT: The investigation dedicated to the ability of examined 16 fungal strains isolated from Antarctic soil probes to grow and develop at low temperatures (5°C and 10°C) were carried out. Most of the strains were able to grow at 10°C. Six of the studied strains do not grow at low temperatures. The strains Penicillium commune AL 2, Aspergillus fumigatus AL 3, Penicillium commune AL 5, Penicillium rugolosum AL 7, Lecanicillium sp. AL 12 and Aspergillus fumigatus AL 15 showed a good growth on a rich culture medium at 5°C and could be classified as psichrophyles. The signs of their growth were observed at about the 8th day of cultivation. Five of the strains (P. commune AL 2, A. fumigatus AL 3, P. coprobioum AL 4, P. rugolosum AL 5, and Alternaria maritima AL 10) were able to grow at 10°C in the presence of 0.3 g/l phenol as well. It was established that P. commune AL 2, A. fumigatus AL 3 and P. rugolosum AL 7 were able to utilize 0.3 g/l phenol as a sole carbon source at 5°C.