期刊
WATER AIR AND SOIL POLLUTION
卷 223, 期 7, 页码 3579-3588出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11270-011-1052-x
关键词
Biodegradation; Toluene; BTEX; Varying temperature; Soil-water pollution
资金
- King Abdullah University of Science and Technology (KAUST)
- Department of Science and Technology (DST), India
An increasing interest in bioremediation of hydrocarbon polluted sites raises the question of the influence of seasonal and diurnal changes on soil-water temperature on biodegradation of BTEX, a widespread group of (sub)-surface contaminants. Therefore, we investigated the impact of a wide range of varying soil-water temperature on biodegradation of toluene under aerobic conditions. To see the seasonal impact of temperature, three sets of batch experiments were conducted at three different constant temperatures: 10A degrees C, 21A degrees C, and 30A degrees C. These conditions were considered to represent (1) winter, (2) spring and/or autumn, and (3) summer seasons, respectively, at many polluted sites. Three additional sets of batch experiments were performed under fluctuating soil-water temperature cases (21 <> 10A degrees C, 30 <> 21A degrees C, and 10 <> 30A degrees C) to mimic the day-night temperature patterns expected during the year. The batches were put at two different temperatures alternatively to represent the day (high-temperature) and night (low-temperature) times. The results of constant- and fluctuating-temperature experiments show that toluene degradation is strongly dependent on soil-water temperature level. An almost two-fold increase in toluene degradation time was observed for every 10A degrees C decrease in temperature for constant-temperature cases. Under fluctuating-temperature conditions, toluene degraders were able to overcome the temperature stress and continued thriving during all considered weather scenarios. However, a slightly longer time was taken compared to the corresponding time at daily mean temperature conditions. The findings of this study are directly useful for bioremediation of hydrocarbon-polluted sites having significant diurnal and seasonal variations of soil-water temperature.
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