NDLI: Experimental evidence for hyperfiltration of saline water through compacted clay aquitard in the Hebei Plain

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Experimental evidence for hyperfiltration of saline water through compacted clay aquitard in the Hebei Plain

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Experimental evidence for hyperfiltration of saline water through compacted clay aquitard in the Hebei Plain

Content Provider	Springer Nature Link
Author	Wang, Ying Chen, Zongyu Duan, Baoqian Shao, Jingli
Copyright Year	2014
Abstract	It becomes an increasing concern that groundwater quality in exploited deep confined aquifer may deteriorate due to brackish water leakage from its overlying saline aquifer in Hebei Plain. However, the monitoring data show that the TDS does not significantly change in the exploited aquifer. Some physics or chemistry processes must have taken place in aquitards during brackish leakage. The semi-permeable membrane function of clay aquitard during the process of hyperfiltration (reverse osmosis) should be one of the most important processes. To confirm and test this hyperfiltration mechanism, a series of experiments were performed in which NaCl solutions were hydraulically forced through different clay sampled from aquitard. The solution 7 g/L in NaCl was forced through at 20 °C by a fluid pressure of 0.5 kN. The results show that hyperfiltration indeed happens in caly aquitard. Semi-permeability is quantified by the reflection coefficient σ. The mean rejection coefficients (σ) for clay samples #1, #2 and #3 were estimated to be 0.063, 0.164 and 0.040, respectively. This behavior of clay was well explained with the theory of the diffuse double layer. The hyperfiltration effect is to the great extent responsible for the chemical process in the aquitard.
Starting Page	1076
Ending Page	1082
Page Count	7
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	25
Issue Number	6
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2014-12-23
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	clay membrane reverse osmosis hyperfiltration aquifer salt Hebei Plain Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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