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- W3154246762 endingPage "125908" @default.
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- W3154246762 abstract "The increasing amount of antibiotics entering the environment through manure usage and sludge application from wastewater treatment plants (WWTP) attracts much concern due to their potential threat to ecological security and human health. When biochar, a soil and water amendment, is introduced into the soil for remediation, the antibiotics are usually co-present with the biochar colloids (BC) or pre-accumulated in soils. However, little is known about the effect of antibiotics on the behavior of BC. Column experiments were conducted at three different pH values to study the effect of sulfamethazine (SMT) or ciprofloxacin (CIP) on BC transport. Under certain conditions (co-present in the influent and pre-sorbed on quartz sand), large numbers of cation and zwitterion forms of the less mobile CIP at pH 5 and 7 led to less negatively-charged surface of BC and quartz sand, resulted in higher BC retention compared to the highly mobile SMT. The decrease in BC transport became more significant with a higher amount of SMT or CIP pre-sorption. Therefore, when biochar is applied into soils polluted by antibiotics, the pH-dependency and the loading amount of antibiotics in soil matrix should be paid attention to as they might affect the transport of BC and the related facilitated-contaminants transport. • Co-present SMT/CIP inhibited the transport of biochar colloids (BC) at pH 5 and 7. • Pre-sorbed SMT/CIP on grain surface decreased BC transport due to charge shielding. • More SMT/CIP accumulation on grain surface caused less BC transport. • Compared to mobile SMT, more CIP were accumulated, resulting in more BC retention." @default.
- W3154246762 created "2021-04-26" @default.
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- W3154246762 date "2021-09-01" @default.
- W3154246762 modified "2023-09-29" @default.
- W3154246762 title "Accumulation of sulfamethazine and ciprofloxacin on grain surface decreases the transport of biochar colloids in saturated porous media" @default.
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- W3154246762 doi "https://doi.org/10.1016/j.jhazmat.2021.125908" @default.
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