铜银负载沸石基质雨水滞留池的除菌性能

针对城市水体的病原微生物污染问题，设计了以铜银负载沸石为基质的雨水滞留池模拟柱，用于去除合流制溢流水中的以大肠菌群为指示菌的病原微生物；通过静态实验考察了制备的载铜和载银沸石的铜、银的流失量和除菌效果，并用模拟柱进行了含不同大肠杆菌浓度的进水及合流制溢流水的除菌实验。结果表明：载铜沸石的Cu²⁺流失量相对于载银沸石的Ag⁺流失量更小；在10⁵~10⁷ CFU·L⁻¹的进水大肠杆菌浓度下，2种沸石柱的除菌率均在90%以上；在连续18 d的运行过程中，2种沸石实验柱对大肠杆菌浓度为10⁶ CFU·L⁻¹的合流制溢流水的除菌率也保持在90%以上，且未受到水中的COD、TN、TP的影响。载铜和载银沸石基质滞留池可以有效地降低雨水中的病原微生物风险。

Bacterial removal performance of rainwater retention tank with copper or silver loaded zeolite substrate

To control pathogenic microorganisms pollution in urban water, a rainwater retention tank with filter media of copper or silver loaded zeolite was designed to remove pathogenic microorganisms with coliform bacteria as indicator bacteria in combined sewer overflow. The metal loss and bacteria-eliminating abilities of copper loaded and silver loaded zeolite were investigated by batch experiments, and the latter was further proved by filled simulated columns test for treating synthetic water with different coliform bacteria concentrations or combined sewer overflow. The results show that Cu2+ loss from copper loaded zeolite was lower than Ag+ loss from silver loaded zeolite. The bacterial removal efficiencies of the two zeolite columns were above 90% at the influent E. coli. concentration of 105~107 CFU·L−1. During 18 d consecutive filtration operation, the bacterial removal efficiencies of the two zeolite columns maintained above 90% for the combined sewer overflow with E. coli. of 106 CFU·L-1, which was not affected by COD, TN and TP. In short, the retention tank with filter media of copper or silver loaded zeolites can effectively reduce the risk of pathogenic bacteria in rainwater runoff.