Methodology development for colloid investigation in groundwater

We examined ultrafiltration and cross flow filtration of groundwater by using an in-situ water monitoring system and a batch type airtight container to identify colloid in groundwater and spring water(at -300m access / research gallery). Additionally, the following know-hows were summarized. Ultrafiltration method using in-situ water monitoring system is possible to ultrafiltrate groundwater maintaining airtight condition. On the other hand, groundwater is contaminated by artificial materials generated drilling borehole. So groundwater is changed with the passage of time. Ultrafiltration method using batch type airtight container is possible to prevent temporal change of groundwater during ultrafiltration. But it is impossible to ultrafiltrate on site. Cross flow filtration method using batch type airtight container is easy to operate, compared with ultrafiltration using an in-situ water monitoring system and a batch type airtight container. However, only a few kinds of filtration membrane are available for colloid size separation. (author)