NDLI: A laboratory column study on particles release in remediation of seawater intrusion region

Content Provider	Springer Nature Link
Author	Zhou, Jun Lin, Guoqing Liu, Jianbo Zhang, Peidong Gong, Lei
Copyright Year	2015
Abstract	In coastal areas, excessive exploitation of groundwater causes seawater intrusion. In artificial recharge of aquifer remediation process, the replacement of saltwater and freshwater with each other causes colloid release, and permeability also decreases. In this paper, the aquifer samples containing minimal clay mineral (mainly illite) in Dagu River aquifer were used. Adopting horizontal column experiments, we studied the influences of seepage velocity and ionic strength on particle release, as well as the relationship between them. In the column experiments, the Critical Salt Concentration (CSC) of the Dagu River aquifer was determined as 0.05 mol L$^{−1}$ approximately. This result was basically consistent with the DLVO theoretical calculation. For the constant seepage velocity, the salinity descending rate and partical release were slower, and the peak of particle concentration was lower. However, the total amount of released particles was almost constant at different salinity descending rate. For constant salinity descending rates, the peak of particle concentration decreased as seepage velocity increased, but the total amount of released particles rose up. The experiments also indicated the existence of a critical seepage velocity, which dropped with the decrease of salt concentration. When the concentration of NaCl solution decreased from 0.17 mol L$^{−1}$ to 0.06 mol L$^{−1}$, the critical seepage velocity decreased from 3 cm min$^{−1}$ to 2.5 cm min$^{−1}$, which is consistent to the results predicted by DLVO theory.
Starting Page	1013
Ending Page	1018
Page Count	6
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	14
Issue Number	6
e-ISSN	19935021
Language	English
Publisher	Science Press
Publisher Date	2015-11-07
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	seawater intrusion particles release critical salt concentration salinity descending rate critical seepage velocity Oceanography Meteorology
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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