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Investigation of Hazardous Substances Transformation in Groundwater and Amending Water Pollution

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. Following the results of the first project, this project held consultation meeting and public hearing, and finished promulgation of Groundwater Pollution Monitoring/Controlling Standards on December, 18th, 2013 according to the official standard procedure. Consultation meeting was also held to review regulatory suitability of cyanides, and to deliberate subsequent revision program. Additionally, 139 potential regulatory groundwater pollutants were established, scored, and classed based on physical/chemical properties and health effects. 19 data-completed pollutants had high priority as monitoring/controlling items, such as acrylonitrile and benzidine. Site inspection, interview, and a two-stage groundwater, soil and sediment quality survey of Petroleum and Chemical Industry were conducted. The results showed that phthalates, nonylphenol, bispehnol A were actually distributed in groundwater, and detected concentrations were between 10-1 and 10-5 mg/L. The necessity of these pollutants to be monitoring/controlling items should be continually assessed in the future. For the elevated groundwater NH4+ concentration of Choshui river alluvial fan, the H and O isotopte compositions of rain water, river water and deep monitoring well groundwater were analyzed to establish the background of subsurface environment. The river water from 3 different chachments were collected to verify the difference of water sources. The results were further adopted for verifying of isotope composition of shallow monitoring well groundwater. The H and O isotope of different water body were also determined, including ditch, paddy field, irrigation channel, private wells to understand the plausible sources of groundwater NH4+ contents. The results indicated that the influences of different surface water on shallow groundwater were significant and lead to the heavier O isotope and increased NH4+ concentration. For groundwater chromium, nickel, selenium and fluoride issue, groundwater investigation and quality analysis were completed. This project already established potential areas for soil chromium/nickel pollution in Hualien-Taitung Valley, and defined naturally-attributed or anthropogenically-attributed areas for groundwater fluoride in Tainan Science Park. Future monitoring plans, quality management and advice on standard revision also presented in this project. Aforementioned results and suggestions could submit to competent authorities as practical implementation references.
Groundwater Pollution Monitoring/Control Standards;High-tech and sunrise industries;Groundwater quality survey