好氧颗粒污泥负载纳米二氧化钛强化磺胺嘧啶降解的机制及性能

Mechanisms and performance of enhanced sulfadiazine degradation by nano TiO-loaded aerobic granular sludge

抗生素在传统污水处理厂的去除效果有限,基于此,制备了一种将纳米二氧化钛(TiO_(2))吸附在好氧颗粒污泥上的生物纳米材料,该材料可以在不影响其他污染物去除性能的情况下提高废水中磺胺嘧啶(SDZ)类抗生素的降解,并强化中间产物的进一步转化。结果表明,AGS对TiO_(2)的吸附满足伪二级吸附动力学,得到的生物纳米材料结构稳定;在TiO_(2)为20 mg·L^(-1)时吸附速率最快、对污泥内细胞和胞外聚合物影响较小;用该材料降解含SDZ的模拟废水时,紫外光照会促进生物纳米材料中异养菌的活性,提高耗氧有机污染物、SDZ及其中间产物对氨基苯磺酸的去除率,10 h内SDZ平均降解速率可达0.97 mg·(L·h)^(-1)。以上获得的新型生物纳米材料可为抗生素废水的处理提供新的技术选择。

The removal effect of antibiotics in conventional wastewater treatment plants is limited. In this study, we prepared a new biological nanomaterial by loading nano titanium dioxide(TiO_(2)) onto aerobic granular sludge(AGS). This biological nanomaterial could improve the degradation of sulfadiazine(SDZ) and facilitate the further conversion of intermediate products without affecting the system performance. The experimental results showed that the adsorption of TiO_(2) on AGS was fitted with pseudo-second-order kinetics model and the structure of the prepared biological nanomaterial was stable. At TiO_(2) of 20 mg·L^(-1), the fastest adsorption rate occurred, and the TiO_(2) had a minor negative effect on cell viability and extracellular polymeric substances. The UV light could promote the activity of heterotrophic bacteria in biological nanomaterials, and improve the removal of COD, SDZ and SDZ intermediate products(4-ABS), and the average degradation rate could reach0.97 mg·(L·h)^(-1) in 10 hours. The nanomaterial provides a new technincal choice for antibiotic wastewater treatment.