Laws and Mechanism of the Fe (III) Clogging of Porous Media in Managed Aquifer Recharge

The use of stormwater for managed aquifer recharge (MAR) has become one the most important ways to deal with water shortages and corresponding environmental geological problems, especially in north China. Fe (III) clogging porous media is a common significant problem that influences effect infiltration rate. This paper focuses on migration characteristics mechanisms iron hydroxides sand columns. results indicate permeability significantly decreased at inlet fine column inside coarse column. We demonstrated that, when concentration was higher, smaller medium size produced more rapidly, there clogging. More than 80% injected remained column, 50% retained within 1 cm inlet. mass retention increased decrease particles increase concentration. main material caused hydroxide colloids, which were form granular or flocculent membrane coating quartz sand. blocking filtration deep bed filtration, adsorption, deposition, strongly affected by coagulation colloidal particles.