Elimination of persistent emerging micropollutants in a suspended-bed photocatalytic reactor: influence of operating conditions and combination with aerobic biological treatment
Elimination of persistent emerging micropollutants in a suspended-bed photocatalytic reactor: influence of operating conditions and combination with aerobic biological treatment
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DOI：
10.1039/c6pp00319b
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发表时间：
2016-11
影响因子：
3.1
通讯作者：
N. Pronina;D. Klauson;T. Rudenko;K. Künnis-Beres;I. Kamenev;S. Kamenev;A. Moiseev;Joachim Deubener;M. Krichevskaya
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文献类型：
--
作者：
N. Pronina;D. Klauson;T. Rudenko;K. Künnis-Beres;I. Kamenev;S. Kamenev;A. Moiseev;Joachim Deubener;M. Krichevskaya
以TiO_2溶胶-凝胶包覆的膨胀粘土颗粒为床层材料，在实验室规模的光催化悬浮床反应器中考察了强力霉素、泼尼松龙、阿莫西林和磺胺甲咪唑及其混合物的氧化去除效果。药物分子对含TiO_2涂层的吸附亲和力越大，其光催化降解潜力越大。通过优化流化工艺参数，提高了光催化反应器的药物去除性能。在高床负载下的反应器操作由催化剂涂层的耐磨性决定。通过最佳负载增强了涂层床的长期稳定性，实现了更高的去除率，同时对涂层颗粒施加适度的机械应力。光催化预处理降低了多西环素溶液对几种细菌菌株的毒性，包括环境细菌恶臭假单胞菌和从活性污泥中新鲜分离的细菌菌株。用光催化处理和生物氧化的组合处理含强力霉素的水导致在生物反应器出口中98%的目标去除，而在生物过程的操作中没有劣化。
A larger, lab-scale photocatalytic suspended-bed reactor using TiO_2 sol-gel-coated expanded clay granules as a bed material was evaluated for oxidative removal of the persistent pharmaceuticals doxycycline, prednisolone, amoxicillin, and sulfamethizole, as well as their mixture, in ppm concentrations. The photocatalytic degradation potential of drug molecules increases as their adsorption affinity increases towards TiO_2-containing coatings. The performance of the photocatalytic reactor in the removal of drugs was improved by optimizing the fluidization process parameters. The reactor operation at high bed loadings is determined by the abrasion resistance of the catalyst coating. The long-term stability of the coated bed was enhanced by optimal loading, achieving a higher removal rate while placing moderate mechanical stress on the coated granules. The photocatalytic pretreatment decreased the toxicity of doxycycline solutions to several bacterial strains, including the environmental bacterium Pseudomonas putida and bacterial strains freshly isolated from the activated sludge. The treatment of doxycycline-containing water with a combination of photocatalytic treatment and bio-oxidation resulted in 98% removal of the target in the bioreactor outlet, with no deterioration in the operation of the biological process.