Steam-treatment-based soil remediation promotes heat-tolerant, potentially pathogenic microbiota
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Steam-treatment-based soil remediation promotes heat-tolerant, potentially pathogenic microbiota. / Altenburger, Andreas; Bender, Mikkel; Ekelund, Flemming; Elmholt, Susanne; Jacobsen, Carsten Suhr.
In: Environmental Technology, Vol. 35, No. 6, 2014, p. 773–780.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Steam-treatment-based soil remediation promotes heat-tolerant, potentially pathogenic microbiota
AU - Altenburger, Andreas
AU - Bender, Mikkel
AU - Ekelund, Flemming
AU - Elmholt, Susanne
AU - Jacobsen, Carsten Suhr
PY - 2014
Y1 - 2014
N2 - We investigated microbiota in surface and subsurface soil from a site, above steam-treated deep sub-soil originally contaminated with chlorinated solvents. During the steam treatment, the surface soil reached temperatures c. 30°C higher than the temperature in untreated soil; whereas the subsurface soil, at a depth of about 40 cm, reached a temperature c. 45°C higher than untreated soil. The soil was examined prior to, during, and 6, 12, 14, 20 and 31 months after treatment. Numbers of bacteria cultivable at 42°C increased significantly in subsurface soil. Similarly, substrate utilization in ECOLOG plates, incubated at 42°C, increased from less than 10% of available carbon sources in the untreated soil to more than 60% of the available carbon sources in the steam-treated soil. Aspergillus fumigatus was quantified as an example of heat-tolerant fungi normally found in compost. These organisms are rarely detected in Danish soils but high numbers (c. 105 hyphal forming units g−1) occurred in the treated soil up to 31 months after the steam-treatment. We conclude that steam-treatment leads to changes of the microbial communities. Some changes are temporary while others can last for years after termination of the steam-treatment; reflecting different strategies that soil microorganisms follow.
AB - We investigated microbiota in surface and subsurface soil from a site, above steam-treated deep sub-soil originally contaminated with chlorinated solvents. During the steam treatment, the surface soil reached temperatures c. 30°C higher than the temperature in untreated soil; whereas the subsurface soil, at a depth of about 40 cm, reached a temperature c. 45°C higher than untreated soil. The soil was examined prior to, during, and 6, 12, 14, 20 and 31 months after treatment. Numbers of bacteria cultivable at 42°C increased significantly in subsurface soil. Similarly, substrate utilization in ECOLOG plates, incubated at 42°C, increased from less than 10% of available carbon sources in the untreated soil to more than 60% of the available carbon sources in the steam-treated soil. Aspergillus fumigatus was quantified as an example of heat-tolerant fungi normally found in compost. These organisms are rarely detected in Danish soils but high numbers (c. 105 hyphal forming units g−1) occurred in the treated soil up to 31 months after the steam-treatment. We conclude that steam-treatment leads to changes of the microbial communities. Some changes are temporary while others can last for years after termination of the steam-treatment; reflecting different strategies that soil microorganisms follow.
U2 - 10.1080/09593330.2013.850520
DO - 10.1080/09593330.2013.850520
M3 - Journal article
C2 - 24645459
VL - 35
SP - 773
EP - 780
JO - Environmental Technology
JF - Environmental Technology
SN - 0959-3330
IS - 6
ER -
ID: 62388473