Researchgroup Lab4U, Faculty of Industrial Engineering, Katholieke Universiteit Leuven (KU Leuven - Diepenbeek), Agoralaan gebouw B, bus 8, Diepenbeek, Belgium.
Researchgroup Lab4U, Department of Industrial Science and Technology, Catholic University College Limburg, Agoralaan gebouw B, bus 3, Diepenbeek, Belgium.
Sci Total Environ. 2014 Jul 1;485-486:764-768. doi: 10.1016/j.scitotenv.2013.11.112. Epub 2013 Dec 8.
Despite the overall high efficacy of cyclodextrins to accelerate the treatment of soil aquifer remediation by in-situ soil flushing, the use in practice remains limited because of the high costs of cyclodextrin and high concentrations needed to significantly reduce the treatment time. The current study tested the potential of activated carbon to treat washing water originating from soil flushing in order to selectively separate hydrocarbon contaminants from washing water containing cyclodextrin and subsequently reuse the cyclodextrin solution for reinfiltration. A high recovery of the cyclodextrin from the washing water would reduce the costs and would make the technique economically feasible for soil remediation. This study aimed to investigate whether cyclodextrin can pass through the activated carbon filter without reducing the cyclodextrin concentration when the contaminated washing water is treated and whether the presence of cyclodextrin negatively affects the purification potential of activated carbon to remove the organic pollutants from the pumped soil water. Lab-scale column experiments showed that with the appropriate activated carbon 100% of cyclodextrin (randomly-methylated-β-cyclodextrin) can be recovered from the washing water and that the effect on the efficiency of activated carbon to remove the hydrocarbon contaminants remains limited. These results show that additional field tests are useful to make in-situ soil flushing with cyclodextrin both a technical and an economical interesting technique. These results might stimulate the application of cyclodextrin in soil treatment technology.
尽管环糊精在原位土壤冲洗修复土壤含水层方面具有很高的整体效率，但由于环糊精成本高且需要高浓度才能显著缩短处理时间，因此其在实践中的应用仍然有限。本研究测试了活性炭处理土壤冲洗产生的洗涤水的潜力，以便从含有环糊精的洗涤水中选择性分离烃类污染物，并随后再用环糊精溶液进行再渗透。从洗涤水中高回收率的环糊精可以降低成本，并使该技术在土壤修复方面具有经济可行性。本研究旨在探讨在处理受污染的洗涤水时，环糊精是否可以通过活性炭过滤器而不降低其浓度，以及环糊精的存在是否会对活性炭去除有机污染物的净化潜力产生负面影响。实验室规模的柱实验表明，通过适当的活性炭，可以从洗涤水中回收 100%的环糊精（随机甲基-β-环糊精），并且对活性炭去除烃类污染物的效率的影响仍然有限。这些结果表明，需要进行更多的现场测试，以使原位土壤冲洗与环糊精相结合成为一种技术和经济上都有趣的技术。这些结果可能会刺激环糊精在土壤处理技术中的应用。
