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| Effect of ionic strength and humic acid on the collaborative transport of kaolinite and sulfamethazine |
| Received:March 03, 2017 |
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| KeyWord:kaolinite;sulfamethazine;porous media;humic acid;DLVO theory |
| Author Name | Affiliation | E-mail | | FENG Tong-tong | Key Laboratory of Groundwater Cycle and Environmental Evolution, China University of Geosciences(Beijing), Beijing 100083, China
College of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China | | | YANG Wen | College of Resource and Environment, China Agricultural University, Beijing 100193, China | | | LIU Ke-si | Department of Pratacultural Sciences, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China | | | TONG Ju-xiu | Key Laboratory of Groundwater Cycle and Environmental Evolution, China University of Geosciences(Beijing), Beijing 100083, China
College of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China | | | SHANG Jian-ying | College of Resource and Environment, China Agricultural University, Beijing 100193, China
Key Laboratory of Arable Land Conservation(North China), Ministry of Agriculture, Beijing 100193, China | jyshang@cau.edu.cn |
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| Abstract: |
| To investigate the effect of soil environmental condition on clay-facilitated sulfamethazine(SM2) transport, kaolinite and SM2 were used as the experimental materials, and column experiments were conducted under different ionic strength(IS) and humic acid(HA) conditions. The results showed that when the IS of the background solution was 0.1 mmol·L-1, the relative concentration of the kaolinite breakthrough curve slightly decreased, from 76% to 70%, after adding SM2 to the suspension. The relative concentration of the SM2 breakthrough curve increased from 5.4% to 50% when a small amount of kaolinite was mixed into the solution. These results show that SM2 slightly inhibited kaolinite mobility in porous media, and kaolinite significantly facilitated the transport of SM2 in porous media. When the IS of the solution increased from 0.1 mmol·L-1 to 10 mmol·L-1, the relative concentrations of kaolinite in the effluents were 70%(0.1 mmol·L-1), 27%(1 mmol·L-1), and 3%(10 mmol·L-1), and the corresponding relative concentrations of SM2 were 50%(0.1 mmol·L-1), 48%(1 mmol·L-1), and 17%(10 mmol·L-1). However, when HA was present in the suspension with high IS(10 mmol·L-1), the relative concentrations of kaolinite and SM2 in the effluents increased from 3% to 57% and 17% to 50%, respectively. These phenomena indicated that facilitated SM2 was reduced as the leaching amount of kaolinite decreased with the IS increasing, and HA enhanced the mobility of kaolinite and facilitated SM2 transport under the condition of high IS. |
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