能耗和水质因素对紫外LED灭活深海油田注水常见细菌的影响

The influence of energy consumption and water quality on the inactiviation of bacteria subsea oil-field injection water by ultraviolet light-emitting diodes

为了探究紫外LED应用于深海油田注水消毒的可行性,通过静态实验考察了255、280、350 nm紫外线对腐生菌、铁细菌和硫酸盐还原菌的消毒能力,并结合光电转换效率考察各紫外LED的能耗差异;此外,考察了水质因素对紫外线透射率及紫外LED灭活异养菌效果的影响.结果表明,紫外LED的单位灭活率能耗受紫外线灭活速率常数和该波长紫外LED的光电转换效率共同影响,尽管255 nm紫外线对腐生菌、铁细菌和硫酸盐还原菌灭活速率常数最大,但280 nm紫外LED针对受试菌种的单位灭活率能耗最低;颗粒物和铁离子等水质因素主要通过影响紫外线透射率对消毒效果产生影响,当紫外线透射率较高时对消毒效果的影响不大;驱动电流相同时,280 nm紫外LED对高细菌负荷水样的消毒更有优势.

The applicability of UV-LEDs on sterilizing bacterial in subsea injection water are investigated. The inactivation efficiency of 255,280,350 nm ultraviolet on saprophytic bacteria,iron bacteria and sulfate reducing bacteria are tested in batch. The discrepancy of energy consumption is analyzed in terms of disinfection efficiency and wall-plug efficiency. Meanwhile,effects of water quality factors on UV transmittance and disinfection efficiency of saprophytic bacteria are studied. The electrical energy consumption of UV-LED is determined by inactivation rate constant and wall-plug efficiency together. The results indicate that although 255 nm UV-LED obtains optimum disinfection effect,280 nm UV-LED approves to be practical owing to low electrical energy consumption. Water quality factors such as particles and Fe ion mainly affect disinfection effect through changing UV transmittance,and the impact on disinfection efficiency is negligible with higher UV transmittance. The 280 nm UV-LED shows advantage in sterilization of samples with high bacteria loads,under the same electric current.