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连续流光催化消毒器灭活E.coli及病毒的性能

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Indexed by:期刊论文

Date of Publication:2018-05-03

Journal:环境科学学报

Volume:38

Issue:9

Page Number:3645-3651

ISSN No.:0253-2468

Key Words:光催化;连续流反应器;E.coli噬菌体;光复活

Abstract:紫外消毒是污水处理常用技术.紫外线仅能破坏微生物的遗传物质,阻断其繁殖,并不能彻底杀死微生物,一旦停止紫外光照射,微生物可在修复酶的作用下恢复活性光催化过程能产生强氧化性·OH,破坏细胞壁和细胞膜,彻底杀死微生物.为考察光催化技术消毒效率、抑制复活性能及应用潜力,在市售紫外消毒器中安装了光催化组件,搭建了连续流动式光催化消毒器.以大肠杆菌(E.coli)和噬菌体为目标物评价其消毒能力.紫外剂量50 mJ·cm-2条件下,初始浓度3.40× 106 CFU·mL-1的E.coli原水流经紫外消毒器后被去除4.12 log10的E.coli,而流经光催化消毒器后去除4.79 log10.同时光催化处理后E.coli的光复活率仅为紫外消毒后的17%.连续运行40 h的灭菌能力稳定.光催化设备对噬菌体F2和噬菌体MS2的去除率分别为6.37 log10和6.00 log10,表明该设备也具有病毒去除能力.

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