中文摘要：

以9种磺胺类、4种氟喹诺酮类以及1种氯霉素为目标物,调查研究了它们在兰州市两个生活污水处理厂中的含量水平和去除特性,初步评估了其在受纳水体中的环境风险.结果表明：污水处理厂进水和出水中均有抗生素检出,浓度差别较大,进水中抗生素浓度在nd~55.25μg·L~（-1）之间,出水中浓度在nd~9.78μg·L~（-1）之间,脱水污泥中抗生素的平均浓度高于活性污泥;抗生素在整个污水处理工艺中的去除率为15.39%~100%,生物转化或降解作用是二级处理过程中的主要去除机制;污水处理厂排水增加了受纳水体中抗生素的浓度,是受纳水体中抗生素的来源之一,环境中低浓度、多种抗生素长期残留,存在较大的潜在风险.

英文摘要：

Antibiotics in the aquatic environment can cause adverse ecological risk and health impacts due to their long-term residue. The antibiotics,including nine sulfonamides,four fluoroquinolones and one chloramphenicol were selected as target compounds to investigate their occurrence and removal efficiency in two sewage treatment plants（ STPs） of Lanzhou. The potential toxicological risk of receiving waters was preliminary assessed at the same time.The results show that,all targets were detected in STPs influent and effluent,and the concentrations varied greatly,ranging from nd ~ 55.25 μg·L~（-1）in influent and nd ~ 9.78 μg·L~（-1）in effluent,with higher average concentration of antibiotics at dewatering sludge. Removal rate of the targets was between15.39% and 100%. biotransformation or degradation is the main removal mechanism in the secondary treatment. Incomplete removal leads to the release of these antibiotics into the receiving water,indicating the STPs effluent is an important source of antibiotic contamination.