College of Land Science and Technology, China Agricultural University, Beijing 100193, China.
Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China.
J Hazard Mater. 2021 Sep 5;417:125908. doi: 10.1016/j.jhazmat.2021.125908. Epub 2021 Apr 21.
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.
由于抗生素通过粪便使用和污水处理厂（WWTP）中的污泥应用进入环境的数量不断增加，由于其对生态安全和人类健康的潜在威胁，引起了广泛关注。当生物炭作为一种土壤和水的改良剂被引入土壤进行修复时，抗生素通常与生物炭胶体（BC）共存或预先积累在土壤中。然而，人们对抗生素对 BC 行为的影响知之甚少。在三种不同的 pH 值下进行了柱实验，以研究磺胺甲恶唑（SMT）或环丙沙星（CIP）对 BC 迁移的影响。在某些条件下（在进水中和石英砂上预先吸附），数量较多的较少移动的 CIP 的阳离子和两性离子形式在 pH 值为 5 和 7 时导致 BC 和石英砂的表面带较少的负电荷，导致 BC 的保留率高于高度移动的 SMT。随着 SMT 或 CIP 预吸附量的增加，BC 迁移的减少变得更加显著。因此，当生物炭应用于被抗生素污染的土壤中时，应该注意 pH 值依赖性和土壤基质中抗生素的加载量，因为它们可能会影响 BC 的迁移和相关的促进污染物的迁移。
