污泥臭氧原位减量工艺中四环素及大环内酯类抗生素的去除

建立了一套中试规模的污泥臭氧原位减量(SOR)系统,通过长期(111 d)运行考察了其对四环素、土霉素、强力霉素和阿奇霉素的去除效果.结果表明,SOR工艺可以实现剩余污泥零排放,化学需氧量和氮的去除性能与常规厌氧/缺氧/好氧(A/A/O)工艺接近,但除磷性能有所下降.SOR工艺出水中目标抗生素浓度与常规A/A/O工艺无明显差别,而污泥中目标抗生素含量明显低于常规A/A/O工艺.质量衡算表明,目标抗生素在A/A/O及SOR工艺中的输入输出均渐趋平衡;SOR工艺进水中91.2%～98.1%的目标抗生素被臭氧降解,而常规A/A/O工艺进水中82.3%～91.2%的目标抗生素随剩余污泥排放.因此,SOR工艺可以同步削减污水处理厂中剩余污泥及抗生素向环境中的排放.

Removal of tetracycline and macrolide antibiotics during in-situ sludge ozone-reduction process

An in-situ sludge ozone-reduction (SOR) system was established at pilot scale, which was operated continuously for 111 d to investigate the removal efficiencies of tetracycline, oxytetracycline, doxytetracycline, and azithromycin. Results indicate that the SOR process could achieve zero discharge of excess sludge, and the removal efficiencies of chemical oxygen demand and nitrogen were close to those obtained in a conventional anaerobic/anoxic/oxic (A/A/O) process, whereas a significant decline in phosphorus removal efficiency was observed. There was little difference in the effluent concentrations of target antibiotics between the SOR and conventional A/A/O processes; however, the target antibiotic concentrations in the sludge decreased significantly in the SOR process. Results of mass balance analysis show that the inputs and outputs of target antibiotics were balanced gradually during a long-term operation of both conventional A/A/O and SOR processes. Ozonation could degrade 91.2%~98.1% of target antibiotics present in the influent of the SOR process, while 82.3%~91.2% of target antibiotics present in the influent of the conventional A/A/O process were released along with excess sludge. Therefore, the SOR process could simultaneously reduce the discharge of excess sludge and antibiotics from wastewater treatment plants to the environment.