جستجوی مقالات مرتبط با کلیدواژه « bioremediation » در نشریات گروه « زمین شناسی »

In this research, bioremediation potential of the aquifer located beneath Shazand Oil Refinery Company was evaluated according to the hydrochemical characteristics of groundwater samples. Groundwater quality determined by sampling from different locations and specifying some hydrochemical parameters such as EC, DO, T, pH as well as concentration of the major ions (Ca2+, Mg2+, (K++Na+), SO4-2, Cl-, (CO3-2+HCO3-)), some heavy metals (Fe+2, Mn+2) and nutrients (N-3, SO4-2). The results revealed that the amount of pH and EC provided a suitable condition for biodegradation of hydrocarbon contaminants. Dissolved oxygen concentration of the samples shows a suitable condition for aerobic biodegradation, however, there is not an optimum condition based on the average temperature and nutrient concentration. Carbon to nitrogen and to phosphorus ratios and also nitrogen to phosphorus ratio are not suitable in the optimum range. It means that in the case of site remediation the aquifer of the area has not adequate ability to conduct natural bioremediation and so an enhanced remediation operation will be inevitable.

The pollution of the environment with toxic heavy metals is spreading throughout the world along with industrial progress. Removal of heavy metals needs advance chemical technology and is more expensive too. The cheaper alternative for this is the bioremediation using heavy metals resistant microorganisms. In this study, 5 heavy metal resistant bacteria were isolated from electroplating effluents collected from Islamshahr. The isolates grew well on nutrient agar containing 1 mM of chromium (Cr). The resistant isolates were identified on the basis of morphological, biochemical and physiological properties. Finally its molecular identity was revealed through 16S rRNA analysis. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolates belong to the following genera: Comamonas, Acinetobacter and Acicovorax. The minimum inhibitory concentrations (MICs) of the isolates were determined. All the isolates showed high resistance to chromium with MICs ranging from 4-6mM. The results suggest that the isolated strains obtained from effluent owing to its high resistance to chromium have a great potential to be employed for bioremediation of chromium contaminated effluents.