Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia E-mail:
Innovation Center of the Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia.
Water Sci Technol. 2019 Sep;80(6):1085-1098. doi: 10.2166/wst.2019.348.
Hospital wastewaters can become a route for dissemination of antibiotic-resistant bacteria to the environment if not properly treated. Some of these bacteria are able to survive conventional disinfection treatments (e.g. chlorination, UV irradiation), which evokes the need for novel disinfection methods. The metal-exchanged zeolites were tested as novel antibacterial agents for wastewater treatment. The natural zeolite clinoptilolite enriched with silver (AgNZ) showed far better antibacterial activity towards hospital pathogenic bacterium Acinetobacter baumannii when compared with copper-exchanged zeolite (CuNZ), with minimal bactericidal concentration of 0.25-2 (AgNZ) compared with 32-64 mg L (CuNZ) in a batch system and respective log 5.6 reduction compared with log 0.5 reduction in a flow system with pure bacterial culture. In the flow system with real effluent wastewater from the treatment plant, the removal of carbapenem-resistant bacteria using AgNZ was 90-100% during the 4 days of the experimental run. These results indicate that the AgNZ efficiently removes pathogenic bacteria from the wastewater, including A. baumannii, and is promising as a disinfectant material in a bead filter system.
如果医院废水得不到妥善处理，可能会成为抗生素耐药菌传播到环境中的途径。其中一些细菌能够耐受常规消毒处理（例如氯化、紫外线照射），这就需要新型的消毒方法。金属交换沸石被测试为用于废水处理的新型抗菌剂。与铜交换沸石（CuNZ）相比，富含银的天然沸石斜发沸石（AgNZ）对医院病原菌鲍曼不动杆菌具有更好的抗菌活性，在批次系统中，最小杀菌浓度为 0.25-2（AgNZ），而在纯细菌培养物的流量系统中，相应的对数减少为 0.5 减少了 5.6。在处理厂实际废水的流量系统中，使用 AgNZ 可去除 90-100%的耐碳青霉烯菌。这些结果表明，AgNZ 可有效地从废水中去除致病菌，包括鲍曼不动杆菌，有望成为珠滤系统中的消毒剂材料。
