Antibiotics are commonly used in livestock and poultry breeding along with organic arsenic. Through long-term accumulation, they can enter into the surrounding soil through various pathways and contaminate the soil. In this paper, tetracycline antibiotics (TCs) and roxarsone (ROX) contaminated soil were used as the representatives of the two kinds of veterinary drugs contaminated soil, respectively, to study the thermal desorption behavior and arsenic stabilization process. Different parameters like heating temperatures, heat duration, stabilizer type and dosage were optimized for effective removal of TCs and ROX. Furthermore, TCs and ROX removal path and ROX stabilization mechanism were explored. Results of the study showed that over 98% of tetracycline antibiotics and roxarsone were effectively removed at 300 °C for 60 min. The heat treatment process of TCs contaminated soil was controlled by the first-order kinetics. Based on the detection of degradation products and thermogravimetric analysis, the possible thermal degradation path of TCs and ROX was proposed. Addition of FeSO₄.7H₂O (10% by weight) as stabilizer during the heat treatment process yielded 96.7% stabilization rate. Through the analysis of arsenic fractions, valence and the characterization of soil samples collected after the heat treatment, mechanism of arsenic stabilization in ROX was explored. The results show that thermal treatment combined with chemical stabilization technology can not only degrade TCs and ROX efficiently and completely, but also convert organic arsenic into inorganic state, which is conducive to better stabilization, and finally achieve effective and safe remediation of this kind of contaminated soil.

抗生素通常与有机砷一起用于畜禽养殖。通过长期积累，它们可以通过各种途径进入周围的土壤并污染土壤。本文以四环素类抗生素（TCs）和罗沙酮（ROX）污染土壤为代表，分别对两种兽药污染土壤进行热解吸行为和砷稳定过程的研究。优化了加热温度，加热时间，稳定剂类型和剂量等不同参数，以有效去除TC和ROX。此外，探索了TC和ROX去除路径以及ROX稳定机理。研究结果表明，在300°C下60分钟可以有效去除98％以上的四环素抗生素和roxarsone。TCs污染土壤的热处理过程由一级动力学控制。基于降解产物的检测和热重分析，提出了TCs和ROX可能的热降解途径。添加硫酸铁在热处理过程中，作为稳定剂的₄ .7H ₂ O（10％重量）产生了96.7％的稳定率。通过分析砷含量，化合价和热处理后收集的土壤样品的特性，探讨了ROX中砷稳定的机理。结果表明，热处理与化学稳定化技术相结合，不仅可以有效，彻底地降解TCs和ROX，而且还可以将有机砷转化为无机态，有利于更好的稳定化，最终实现对此类污染物的有效安全修复。泥。