| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程研究所 === 103 === In subtle and complex groundwater systems, the pollution problem is a non-sense pollution, water pollution is not wildly table can be directly observed and feelings of people, and therefore the severity of contamination and often difficult to detect, shall be after the investigations to confirm whether the site is contaminated.The soil / groundwater as a variety of pollutants final destination, once contaminated repopulation very difficult standard to achieve regulatory remediation of soil / groundwater pollution remediation costs are often tens of millions to hundreds of millions, the cost is enormous.
In recent years, there were several researches about the treatment methods of BTEX contaminated groundwater site. According to those results, the decomposition rates of BTEX by the aerobic microorganismswere faster than the anaerobic microorganisms. Therefore, the object of this study was the development the green biological treatment methods of BTEX contaminated groundwater by aerobic microorganisms with biostimulation.
First, the effect of the biostimulation agent was confirm by the batch BTEX decomposition experiments. The decomposition rates of BTEX in aerobic environment was increased by adding the biostimulation agent. In the second step, several kinds of agent were added into BTEX contaminated groundwater, which were aerobic microorganisms includedbiostimulation, high-oxygen water and bio-surfactant. In the case of the low total bacteria (< 10-4 CFU/mL) in contaminated groundwater, it were not different between the addition of the high-oxygen water and bio-surfactant and the decomposition rate of BTEX could be improved by adding the biostimulation agent significantly. When the total mounts of bacteria was higher than < 10-4 CFU/mLin contaminated groundwater, the addition of the biostimulation agent was not advantage for BTEX decomposition, but the BTEX decomposition rates were increased by the addition of the high-oxygen water.
Finally, the dosage of the biostimulation agent were confirm. The total mounts of bacteria was a very important factor for the BTEX decomposition by aerobic microorganisms.Overall, the removal rate of benzene, toluene, ethylbenzene m, p-xylene and o-xylene were 99.4%, 99.3%, 99.7%, 96.7% and 96.3% at the first 48hrs when the total mounts of bacteria was higher than10-4 CFU/mL, respectively.
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