Open AccessColloid clogging of saturated porous media under varying ionic strength and roughness during managed aquifer recharge
Author(s) -
DU Xinqiang,
Yalin Song,
Xueyan Ye,
Ran Luo
Publication year - 2019
Publication title -
journal of water reuse and desalination
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.548
H-Index - 16
eISSN - 2408-9370
pISSN - 2220-1319
DOI - 10.2166/wrd.2019.041
Subject(s) - clogging , permeability (electromagnetism) , colloid , porous medium , porosity , materials science , surface roughness , pervious concrete , surface finish , groundwater recharge , chemical engineering , geotechnical engineering , aquifer , composite material , chemistry , membrane , geology , engineering , groundwater , cement , biochemistry , archaeology , history
Column experiments were conducted to examine the clogging effects of colloids under controlled conditions of solution ionic strength (IS) and porous media roughness. The results showed that colloids in recharge water play an important role in the clogging process of saturated porous media, such that even a small amount of colloid may cause a large reduction in the permeability of the porous medium. Clogging at the pore throat was inferred to be the main reason for the severe permeability reduction of porous media. The characteristics of colloid clogging were clearly influenced by both IS and medium roughness. Recharge water with a higher IS facilitated greater attachment of colloids to the surface of the saturated porous medium, which lead to superficial clogging, while collectors with a rough surface resulted in greater clogging than collectors with a
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