Typical Sulfonamide Antibiotics Removal by Biochar-Amended River Coarse Sand during Groundwater Recharge

Rui Liu, Hechun Yu, Xiaoshu Hou (), Xiang Liu, Erping Bi, Wenjing Wang and Miao Li
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Rui Liu: China Urban Construction Design & Research Institute Co., Ltd., Beijing 100120, China
Hechun Yu: Nanchang Institute of Environmental Science Co., Ltd., Nanchang 330000, China
Xiaoshu Hou: Chinese Academy of Environmental Planning, Beijing 100012, China
Xiang Liu: School of Environment, Tsinghua University, Beijing 100084, China
Erping Bi: Key Laboratory of Water Resources and Environment Engineering, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
Wenjing Wang: China Urban Construction Design & Research Institute Co., Ltd., Beijing 100120, China
Miao Li: School of Environment, Tsinghua University, Beijing 100084, China

IJERPH, 2022, vol. 19, issue 24, 1-12

Abstract: The high porosity of medium-coarse sand (MCS) layers in groundwater recharge areas presents a high environmental risk. Sulfamethoxazole (SMX) and trimethoprim (TMP) are two common sulfonamide antibiotics in surface water that have a high propensity to migrate into groundwater. In this study, four biochars were prepared and biochar-amended soil aquifer treatment (SAT) columns were constructed to remove SMX and TMP. Batch experiments demonstrated that the sorption isotherms conformed to the Freundlich model. The maximum adsorptions of biochars prepared at 700 °C were 54.73 and 67.62 mg/g for SMX and 59.3 and 73.38 mg/g for TMP. Electrostatic interaction may be one of the primary mechanisms of adsorption. The column experiments showed that the SMX and TMP removal rate of the biochar-amended SAT was as high as 96%, while that of the MCS SAT was less than 5%. The addition of biochar greatly improved the retention capacity of the pollutants in the MCS layer in the groundwater recharge area and effectively reduced environmental risk.

Keywords: sulfonamide antibiotics; biochar; river coarse sand; groundwater recharge (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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