环丙沙星对强化生物除磷系统的长期影响及其动力学研究  

Long-term effects of ciprofloxacin on enhanced biological phosphorus removal system and its kinetics

作　　者：王如意[1] 林逸文 楼菊青[1] 蔡靖[1] 孙培德[1] WANG Ruyi;LIN Yiwen;LOU Juqing;CAI Jing;SUN Peide(School of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310012)

机构地区：[1]浙江工商大学环境科学与工程学院,杭州310012

出　　处：《环境科学学报》2024年第6期11-19,共9页Acta Scientiae Circumstantiae

基　　金：浙江工商大学“数字+”学科建设管理项目(No.SZJ2022C010);浙江省属高校基本业务费专项资金(No.QRK22004);浙江省基础公益研究计划项目(No.LGF19E080003)。

摘　　要：为控制水体富营养化,强化生物除磷(Enhanced biological phosphorus removal,EBPR)是一种普遍应用的污水磷去除技术.环丙沙星(Ciprofloxacin,CIP)作为使用广泛的一种喹诺酮类药物,具有污水中浓度高、生物毒性效应显著等特点.本文通过考察不同浓度CIP对EBPR系统的除磷性能、污泥特性、胞外聚合物(Extracellular polymeric substances, EPS)、活性氧(Reactive oxygen species, ROS)及吸、释磷速率的长期影响,揭示其作用机制及动力学影响规律.研究结果表明,CIP在EBPR系统中几乎不被吸附降解,且对厌氧磷释放和好氧磷吸收过程的抑制作用存在剂量效应和时间效应.CIP为0.005 mg·L^(-1)时,EBPR系统的除磷效果逐渐变差,50 d后好氧末的PO43--P的浓度为1.26 mg·L^(-1).CIP分别为0.05 mg·L^(-1)和0.1 mg·L^(-1)时,除磷效果出现了快速恶化后恢复并稳定的现象,但污泥出现严重的膨胀.进一步分析发现,由于EPS含量的降低以及ROS的快速增加,导致试验的前10 d除磷效率下降.10 d后,除磷效率出现的稳定和回升的现象可能与EPS总量和组成的相对稳定以及ROS的下降及稳定有关.此外,Hill方程可以较好地拟合CIP对EBPR系统的最大释磷速率和最大吸磷速率的抑制作用,Hill方程参数随着作用时间的变化而变化.Enhanced biological phosphorus removal(EBPR)is a widely applied process for removing phosphorus(P)from wastewater,addressing eutrophication problems.Ciprofloxacin(CIP),a prevalent fluoroquinolone antibiotics,poses a challenge due to its high concentration in wastewater and significant biological toxicity.This study investigates the long-term effects of CIP on phosphorus removal performance,sludge characteristics,extracellular polymeric substances(EPS),reactive oxygen species(ROS),phosphorus release rate,and phosphorus uptake rate in the EBPR system,aiming to reveal its mechanism and kinetics.The results showed that minimal adsorption and degradation of CIP in the EBPR system,with its inhibitory effect on anaerobic phosphorus release and aerobic phosphorus uptake being dose-and time-dependent.At 0.005 mg·L^(-1) CIP,phosphorus removal efficiency gradually declined and the PO43--P was 1.26 mg·L^(-1) at the end of the aerobic phase on day 50.At 0.05 mg·L^(-1) and 0.1 mg·L^(-1) CIP concnetrations,rapid phosphorus removal efficiencies deterioration ensued,followed by recovery and eventual stablity,albeit with severe sludge bulking.Further investigation indicated that reduced EPS production and the heightened ROS levels during the initial 10 day operation led to reduced phosphorus removal efficiency.Subsequently,phosphorus removal efficiency became stable and recovered might be related to the stability of EPS production and composition and the decrease and stability of ROS.Furthermore,the Hill function well fitted the inhibitory effect of CIP on the maximum phosphorus release rate and the maximum phosphorus uptake rate in the EBPR system,with parameters varing over time.

关 键 词：活性污泥 胞外聚合物 活性氧 Hill方程 

分 类 号：X703[环境科学与工程—环境工程]