A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Migration characteristics of atrazine in porous media during managed aquifer recharge
To study the influences of sand and gravel layer and groundwater velocity of Yufuhe River on atrazine migration, adsorption-desorption and sand column experiments were carried out. Results show that the adsorption capacity of montmorillonite, raw sand and washed sand to atrazine sequentially weakens. In different media, the time for atrazine concentrations to peak in washed sand with montmorillonite (WSM), raw sand and washed sand is 60, 135 and 105 minutes respectively, and the peak concentration accounts for 84, 90 and 95% of the initial concentrations. Under different flow rates, the peak time in washed sand at flow rates of 100, 150 and 200 mL/min is 135, 105 and 75 minutes, and the peak time in WSM is 90, 60 and 45 minutes, respectively. Results from this study indicate that increasing flow velocity and suspended colloids concentrations can promote the migration of atrazine in aquifers, while the presence of clay minerals in sand and gravel layers can reduce atrazine migration. Thus, during Yellow River water recharging, the sand and gravel layer of Yufuhe River is helpful to protect the aquifer, but the colloids-associated migration of atrazine can contaminate groundwater in underlying karst aquifer. HIGHLIGHTS Migrations of atrazine in porous media are related to clay minerals and colloids.; Sand and gravel layer can retard the atrazine migration during managed aquifer recharge (MAR).; Increasing groundwater velocity would accelerate atrazine migration.; This study is significant to maintain the long-term operation of the MAR.;
Migration characteristics of atrazine in porous media during managed aquifer recharge
To study the influences of sand and gravel layer and groundwater velocity of Yufuhe River on atrazine migration, adsorption-desorption and sand column experiments were carried out. Results show that the adsorption capacity of montmorillonite, raw sand and washed sand to atrazine sequentially weakens. In different media, the time for atrazine concentrations to peak in washed sand with montmorillonite (WSM), raw sand and washed sand is 60, 135 and 105 minutes respectively, and the peak concentration accounts for 84, 90 and 95% of the initial concentrations. Under different flow rates, the peak time in washed sand at flow rates of 100, 150 and 200 mL/min is 135, 105 and 75 minutes, and the peak time in WSM is 90, 60 and 45 minutes, respectively. Results from this study indicate that increasing flow velocity and suspended colloids concentrations can promote the migration of atrazine in aquifers, while the presence of clay minerals in sand and gravel layers can reduce atrazine migration. Thus, during Yellow River water recharging, the sand and gravel layer of Yufuhe River is helpful to protect the aquifer, but the colloids-associated migration of atrazine can contaminate groundwater in underlying karst aquifer. HIGHLIGHTS Migrations of atrazine in porous media are related to clay minerals and colloids.; Sand and gravel layer can retard the atrazine migration during managed aquifer recharge (MAR).; Increasing groundwater velocity would accelerate atrazine migration.; This study is significant to maintain the long-term operation of the MAR.;
Migration characteristics of atrazine in porous media during managed aquifer recharge
Xiuxiu Sun (author) / Weiping Wang (author) / Weidong Zhao (author) / Shisong Qu (author) / Qingyang Zheng (author)
2021
Article (Journal)
Electronic Resource
Unknown
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