| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 106 === Heavy metal hexavalent chromium remediation of contaminated sites survey found that in the past, the main aquifer chromium contamination from industrial waste and hazardous waste caused by improper disposal, hexavalent chromium is carcinogenic and its electric charge and the nature of the soil same. This in turn results in high mobility in the aquifer. And hexavalent chromium having strong oxidizing contaminants, and therefore susceptible to the reduction in the aquifer interval, it is more difficult to handle on a renovation project. In recent years, many scholars dedicated to research, the use of microbial metabolic reduction mechanism of the reduction of pollutant degradation and decomposition of contaminants in the soil or groundwater through microbes, for sites less destructive, it can be increased by the addition of substrate concentration of carbon source, by raising the carbon source to stimulate the growth of microbial flora thereby strengthening the effectiveness of bioremediation. Therefore enhance anaerobic bioremediation technology through to now, for the long-term by hexavalent chromium contaminated groundwater, promote bio-economy in line with the reduction and green remediation technologies. Domestic terrain (mountains and river alluvial fan) affect the parts of the aquifer in the case showed faster the flow rate, resulting in improvement of the drug into the time of remediation due to high transmission losses and improve remediation costs more easily, thus improving the overall Remediation difficulties. Purpose of this study for the development of green denatured colloidal release material, wherein the perfusion characteristics thereof capable of forming a complex colloidal special form interposed between the solid and the liquid. Colloidal particles form a gel in soil pore water layer, this increased area of exposure to contaminants and material retention may be utilized functional groups of the surface of the substrate gel adsorption and release of carbon sources by microorganisms, while the gel matrix formed of three-dimensional a mesh structure, may also be provided to enhance microbial adhesion remediation efficiency. In this study, the basic characteristics of the green modified colloidal release material were first analyzed, followed by the lead test and the flow test to evaluate the optimal colloidal release material ratio suitable for soil groundwater. On the other hand, the study used the gel matrix. The tube-column experiments were carried out in the group, the gel-bound molasses group and the directly added molasses group. The water quality parameters, hexavalent chromium reduction and total chromium change and distribution of the matrix in each group were simulated. Finally, in column experiments with bacteria analyzed to understand the characteristics and advantages of the bacteria by the next generation of gene sequencing (next generation sequencing, NGS) for real time binding analysis by quantitative polymerase chain reaction (real-time polymerase chain reaction, real-time PCR) the changes to facilitate subsequent current remediation applications. The results of the strength tests of the gel matrix of the present study showed that the gelatin concentration was maintained at 3% and the agar concentration was 0.5%. When the pharmaceutical injection can be smoothly formed floc particles and an agent to increase the groundwater contaminants to the contact area between the soil pore. The results shown by the column, the gel matrix after injection to render a neutral pH range between pH 7.4 to pH 7.5, hexavalent chromium contaminated water that was acidified and pH of the gel matrix may be post-experimental buffer through the column by matrix organic acid fermentation inhibiting the growth of microbiological The development of this study denaturation green colloid release, in addition to effectively control the pH value, providing a carbon source for microbial stable for use, and concentrated to hexavalent chromium and colloidal gel-forming region is fixed to the target matrix molasses contaminated area, the extension region perfusion molasses the residence time, so green colloid degeneration slow-release material bioremediation of groundwater contaminated by hexavalent chromium with innovative research and development, environment-friendly, water and soil remediation technology development potential.
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