Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing 100085, China; College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China.
Research Center for Eco-Environmental Science, Chinese Academy of Science, Beijing 100085, China.
J Environ Manage. 2024 Apr;356:120709. doi: 10.1016/j.jenvman.2024.120709. Epub 2024 Mar 27.
The removal of tetracycline from the sewage plant effluents through advanced treatment methods is key to controlling tetracycline levels in the water environment. In this study, modified quartz sands (QS) were used in a biological sand filter to remove tetracycline. The modified QS, with different surface characteristics, were prepared using glass etching technology combined with subsequent chemical modification methods, including hydroxylation treatment, metal ion modification, and amino modification. The adsorption efficiency of hydroxylated QS was higher than that of metal ion modified and amino modified QS, with adsorption efficiencies of 20.4331 mg/kg, 12.8736 mg/kg, and 10.1737 mg/kg, respectively. Results indicated that QS primarily reduce tetracycline through adsorption. Adsorption on ordinary QS fit the pseudo-first-order kinetic model, while adsorption on other modified QS and biofilm-coated QS fit the pseudo-second-order kinetics model. Biodegradation was identified as another mechanism for tetracycline reduction, which fit the zero-order kinetic model. Pseudomonas alcaligenes and unclassified Pseudomonas accounted for 96.6% of the total tetracycline-degrading bacteria. This study elucidates the effectiveness and mechanisms of five types of QS in treating tetracycline from sewage plant effluents. It provides a novel method for tetracycline reduction in real-world wastewater scenarios.
通过高级处理方法从污水处理厂废水中去除四环素是控制水环境中四环素水平的关键。在这项研究中，改性石英砂（QS）被用于生物砂滤器中去除四环素。具有不同表面特性的改性 QS 通过玻璃蚀刻技术与随后的化学改性方法（包括羟化处理、金属离子改性和氨基改性）制备。经羟化处理的 QS 的吸附效率高于金属离子改性和氨基改性的 QS，吸附效率分别为 20.4331mg/kg、12.8736mg/kg 和 10.1737mg/kg。结果表明，QS 主要通过吸附来降低四环素。普通 QS 上的吸附符合拟一级动力学模型，而其他改性 QS 和生物膜覆盖 QS 上的吸附符合拟二级动力学模型。生物降解被确定为降低四环素的另一种机制，符合零级动力学模型。假单胞菌和未分类假单胞菌占总四环素降解菌的 96.6%。本研究阐明了五种 QS 处理污水处理厂废水中四环素的有效性和机制。它为实际废水场景中的四环素降低提供了一种新方法。
