National Engineering Research Center for Urban Pollution Control, Tongji University, Shanghai, China.
Environ Technol. 2012 Jun;33(10-12):1167-74. doi: 10.1080/09593330.2011.618929.
This study focused on the disinfection of dual electrodes with a gas diffusion cathode using total heterotrophic bacteria as indicator microorganisms. Batch tests were performed to study the effects of platinum load W(Pt) and the pore-forming agent content WNH4HCO3 in gas diffusion electrodes on the germicidal efficacy eta and H2O2 yield. The results showed that the disinfection improved with W(Pt), but its efficiency at W(Pt) of 3 per thousand was equivalent to W(Pt) of 4 per thousand. The right amount of the pore-forming agent improved disinfection. Continuous tests were performed to study residence times (RTs), pH and oxygen flow rates Qo2 on the germicidal efficacy and H2O2 yield. The results indicated that at the steady state total heterotrophic bacteria in the outlet stream were completely inactivated under our experimental conditions. Disinfection improved with increasing RT. This phenomenon was more significant when RT < 20 min. A drop in pH value resulted in the rapid rise of germicidal efficacy, while disinfection shortened with an increasing oxygen flow rate Qo2. The operating costs are high. Further research is required to fully understand all parameters and reduce operating costs.
本研究采用总异养菌作为指示微生物，聚焦于双极膜气体扩散阴极的消毒。通过批量试验研究了气体扩散电极中铂载量 W(Pt)和造孔剂 WNH4HCO3 含量对杀菌效率 eta 和 H2O2 产量的影响。结果表明，消毒效果随 W(Pt)的增加而提高，但 W(Pt)为 3‰时的效率与 W(Pt)为 4‰时相当。适量的造孔剂可提高消毒效果。通过连续试验研究了停留时间（RTs）、pH 值和氧气流量 Qo2 对杀菌效率和 H2O2 产量的影响。结果表明，在我们的实验条件下，出口流中的总异养菌在稳定状态下完全失活。随着 RT 的增加，消毒效果提高。当 RT<20min 时，这种现象更为显著。pH 值下降会导致杀菌效率迅速上升，而随着氧气流量 Qo2 的增加，消毒时间会缩短。运行成本较高。需要进一步研究以充分了解所有参数并降低运行成本。
