原电池耦合A/O-MBR工艺去除畜禽养殖废水中的盐酸四环素

以畜禽养殖废水中的盐酸四环素(TC-HCl)为目标污染物，研究其在水环境中的降解特性，利用原电池与传统A/O-MBR工艺相耦合，去除水中的TC-HCl，并考察其效果。结果表明：废水中的物质组成、环境温度、TC-HCl初始质量浓度以及光照强度均会影响水体中TC-HCl的降解情况；TC-HCl的初始质量浓度为30 mg·L⁻¹，在28 ℃、40%光照下恒温培养60 h后的降解率为98.70%，降解过程符合一级反应动力学(R²=0.991)，半衰期为10.7 h。原电池耦合A/O-MBR工艺的进水COD、NH₃-N和TP分别为500、25、5 mg·L⁻¹时，系统出水水质可达《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准；对10.00 mg·L⁻¹的TC-HCl，系统15 min去除率可达92.02%。A/O-MBR工艺可明显强化传统A/O工艺的脱氮除磷效能；耦合原电池可将膜污染周期提升至24 d左右，有效延缓膜污染。

Removing tetracycline hydrochloride from livestock and poultry breeding wastewater by the coupling process of galvanic cell and A/O-MBR

Tetracycline hydrochloride (TC-HCl), one of the most detected antibiotics in livestock and poultry breeding wastewater, was taken as the target pollutant to study its degradation characteristics in the water environment. The coupling process of galvanic cell and the traditional A/O-MBR was used to remove TC-HCl from the simulated wastewater. The results showed that wastewater composition, ambient temperature, the initial mass concentration of TC-HCl and the light intensity affected on the degradation of TC-HCl in the wastewater. The degradation rate of TC-HCl with initial concentration of 30 mg·L−1 was 98.70% under 60 h thermostatic incubation conditions at 28 ℃ and 40% illumination. The degradation process followed the first-order reaction kinetics (R2=0.991), and the half-life was 10.7 h. When the influent concentration of COD, NH3-N and TP were 500, 25, 5 mg·L−1, respectively, the effluent water quality of the coupling process could meet the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918-2002). After 15min treatment by the coupling process, the removal rate of TC-HCl with initial concentration of 10 mg·L−1 could reach 92.02%. The A/O-MBR process could significantly enhanced the nitrogen and phosphorus removal efficiency of the traditional A/O process. The coupled galvanic cell could extended the membrane pollution cycle to 24 d, which could effectively delay membrane fouling.