饮用水中悬浮颗粒物对微生物聚集和消毒效果的影响

Effect of suspended particles in drinking water on microbial aggregation and disinfection

针对目前有关消毒剂胁迫下颗粒物对微生物保护作用机制尚不清晰,以饮用水中微生物为研究对象,通过构建静态模拟实验装置,解析消毒剂胁迫下针铁矿对微生物聚集和消毒效果的影响机制.结果表明,当未投加消毒剂氯时,针铁矿浓度对水中微生物失活率基本没有影响;而当有氯存在时,针铁矿促进氯的衰减、微生物胞外聚合物的分泌以及其聚集行为,进而增强其抵抗消毒剂灭活的能力,尤其在0.5mg/L氯时,其保护效果较为显著.

Considering that the mechanism of disinfection-stressed protection effects of suspended particles on microbes remained unclear,this study investigated the chlorination-stressed protection effects of these particles on microbes in drinking water by analyzing microbial physiological characteristics and aggregation behaviors via a static experimental setup.The results showed that goethite dosage had a minor impact on the logarithmic inactivation rate on microbes in drinking water when the absence of chlorine.However,the presence of goethite stimulated microbial aggregation behaviors and the chlorine decay process,thus goethite playing a protective role when associating with chlorination stress,particularly at 0.5mg/L chlorine.