Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden.
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden.
Sci Total Environ. 2017 Jan 1;575:767-778. doi: 10.1016/j.scitotenv.2016.09.117. Epub 2016 Oct 1.
Globally, an enormous number of polluted areas are in need of remediation to prevent adverse effects on health and environment. In situ remediation and especially the monitoring thereof needs further development to avoid costly and hazardous shipments associated with excavation. The monitoring of in situ remediation actions needs easier and cheaper nondestructive methods for evaluation and verification of remediation degree and degradation status of the contaminants. We investigate the Direct Current resistivity and time-domain Induced Polarization tomography (DCIP) method and its use within the context of a DNAPL (Dense Non-Aqueous Phase Liquids) contaminated site in Varberg, Sweden, where an in situ remediation pilot test has been performed by stimulated reductive dechlorination by push injection. Our results show that the DCIP technique is an emerging and promising technique for mapping of underground structures and possibly biogeochemical spatial and temporal changes. The methodology could in combination with drilling, sampling and other complementary methods give an almost continuous image of the underground structures and delineation of the pollutant situation. It can be expected to have a future in monitoring approaches measuring time lapse induced polarization (IP), if more research is performed on the parameters and processes affecting the IP-signals verifying the interpretations. The IP technique can possibly be used for verification of the effectiveness of in situ remediation actions, as the current sampling methodology is inadequate.
全球范围内，有大量的污染区域需要修复，以防止对健康和环境造成不利影响。原位修复，特别是监测，需要进一步发展，以避免与挖掘相关的昂贵和危险的运输。原位修复措施的监测需要更简单和更便宜的非破坏性方法，以评估和验证修复程度和污染物的降解状态。我们研究了直流电阻率和时域激发极化层析成像（DCIP）方法及其在瑞典瓦尔贝里一个含有 DNAPL（致密非水相液体）污染场地的应用，在那里，通过推注刺激还原脱氯进行了原位修复试验。我们的结果表明，DCIP 技术是一种新兴的、有前途的技术，可用于地下结构的测绘以及可能的生物地球化学时空变化。该方法可与钻探、采样和其他补充方法相结合，几乎连续地对地下结构进行成像，并对污染物状况进行描绘。如果对影响 IP 信号的参数和过程进行更多的研究，以验证解释，那么该方法有望在测量时移感应极化（IP）的监测方法中得到应用。如果目前的采样方法不够充分，那么 IP 技术可能可用于验证原位修复措施的有效性。
