Furukawa Yasuhide, Mukai Kazuhiro, Ohmura Keisuke, Kobayashi Takeshi
Takenaka Corporation, Research and Development Institute, 1-5-1 Ohtsuka, Inzai, Chiba, 270-1395, Japan.
Yokohama National University, 79-1 Tokiwadai, Hotogayaku, Yokogama, 240-8501, Japan.
Environ Sci Pollut Res Int. 2017 Mar;24(7):6504-6511. doi: 10.1007/s11356-016-8283-8. Epub 2017 Jan 10.
Soil contamination has become a crucial issue in urban redevelopment. Japan has many contaminated sites on which manufacturing has been conducted over several decades. Site holders are now under pressure to manage chemical contamination; however, the use of heavy machinery is difficult in remedial operations on restricted sites, especially where there are still working factories. The slant well is a potentially useful technique in such settings, but its use is technically challenging because of the need for high drilling accuracy and the difficulty in sealing the slanted bores. In this study, we investigated an improved technique for slant drilling that can be used around existing structures to treat contaminated soil and groundwater. A key to this novel approach was the use of water-swelling materials as sealants. Research at a test site investigated the accuracy of drilling. Tracer tests were also conducted using sodium chloride and urea. The improved slant borings showed a deviation of less than 2% from the target bore. The spread of the two tracers at different depths was demonstrated. The proposed technique provides a useful approach to the treatment of brownfield sites in countries where in situ remediation has not yet been undertaken.
土壤污染已成为城市重建中的一个关键问题。日本有许多受污染场地，几十年来一直在这些场地进行制造业活动。场地所有者目前面临着管理化学污染的压力；然而，在受限场地进行修复作业时，使用重型机械很困难，尤其是在仍有工厂在运营的地方。斜井在这种情况下可能是一种有用的技术，但由于需要高精度钻孔以及密封斜孔存在困难，其应用在技术上具有挑战性。在本研究中，我们研究了一种改进的斜向钻孔技术，该技术可用于现有建筑物周围以处理受污染的土壤和地下水。这种新方法的关键是使用水溶胀材料作为密封剂。在一个试验场地进行的研究考察了钻孔的精度。还使用氯化钠和尿素进行了示踪剂测试。改进后的斜孔与目标孔的偏差小于2%。展示了两种示踪剂在不同深度的扩散情况。所提出的技术为尚未进行原位修复的国家的棕地治理提供了一种有用的方法。
