| 英文摘要 |
The purposes of this project were to investigate the groundwater contamination potential of hazardous materials from sunrise industries and concerned catchments and to establish the controlling strategies of groundwater pollution. The tasks of this project were to revise the groundwater pollution monitoring/ controlling standards, to evaluate the contamination potential of sunrise industries, to assess and manage the contamination of groundwater Fe, Mn, As, and to conduct the groundwater quality survey in proximal area of Choshui river alluvial fan.
Since the promulgation of groundwater pollution monitoring/ controlling standards on November 2001, the monitoring/ controlling items and standards did not substantive amended. Hence the contents of monitoring/controlling standards were reviewed and revised in this project. In addition, the international trends and internal industrial development were considered to develop amendment plans. During the execution of this project, three consultation meetings had been held. The comments were deliberated for achieving the draft amendment of groundwater pollution monitoring/controlling standards. The political briefing and the pre-announcement of the draft amendment had been completed on December 2012 and February 2013, respectively.
The production of high-tech and sunrise industries, the exercise of chemicals, and the generation of wastewater situation were also investigated in this project. According to the factors, including production characteristics, the use of chemicals, amount of wastewater emissions, and public concern, the site inspection, interview, and a two-stage groundwater quality survey of manufacturing industry of wafer fabrication, semiconductor, optoelectronic materials and components were firstly conducted. The results showed that the trace elements, such as indium (In) and molybdenum (Mo) might cause groundwater contamination by infiltration via underground pipelines damaged or effluents discharged to receiving water body. Hence the chemicals were amended as the items of the groundwater pollution monitoring/controlling standards.
Additionlly, the results of chemical compositions of groundwater and sediment, sequential extraction and XRD analysis of sediment in high groundwater Fe, Mn, As catchments implied that the As-contained Fe/Mn oxyhydroxides was the primary source of groundwater As. The reductive dissolution of the As-contained Fe/Mn oxyhydroxides, causing by reduction condition of subsurface lead to the release of Fe, Mn, As. Moreover, the distribution of As contamination potential and the procedure of anthropogenic/ geogenic source discrimination of groundwater As were established for further application in the groundwater pollution monitoring/ controlling standards.
The elevated nitrate content in groundwater of proximal area of Choshui river alluvial fan was critical. Based on the site inspection, interview, and groundwater quality survey, the extended agricultural practice was the main land use of this area. Chemical or organic fertilizers were often administered overdose during cultivation, accompanying with the thick gravel sedimentary and oxidation condition lead to the accumulation of nitrate contents in groundwater. Besides, pesticides were not amended as the items of the groundwater pollution monitoring/controlling standards, because pesticides were not detected in groundwater in this project.
The results of groundwater investigation in this project were used for the review and modification of the groundwater pollution monitoring/controlling standards and for the development the physico-chemical characteristics and toxicities of concerned pollutants groundwater. This project also provided suggestions of the groundwater pollution monitoring/controlling standards and information of global environmental issues.
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