水质对紫外消毒在两种典型再生水中应用的影响  

Influence of water quality on UV disinfection in two typical reclaimed waters

作　　者：王秀娟[1] 胡学香[1] 胡春[1] 

机构地区：[1]中国科学院生态环境研究中心水质学国家重点实验室,北京100085

出　　处：《环境工程学报》2012年第12期4289-4293,共5页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07314-003;2009ZX07424-003);北京市教育委员会共建项目专项资助

摘　　要：以大肠杆菌为对象,研究了再生水水质变化对紫外消毒效果和光复活的影响。结果表明,紫外对大肠杆菌有很强的灭活作用,在紫外剂量为4 mJ/cm2时,大肠杆菌的灭活率达到了4.41个对数级。腐殖酸、铁和2种再生水水体中其他溶解性物质会影响光吸收和紫外透射率,但对紫外消毒动力学无影响。在颗粒物浓度为0～200 mg/L的范围内,外源高岭土和活性污泥等颗粒物的投加对紫外消毒效果影响较小,而再生水水样W1中原有的2.6 mg/L的颗粒物则会极大地影响消毒效果,使UV对细菌的灭活出现明显的拖尾现象。腐殖酸会增强紫外损伤大肠杆菌的光复活能力,但2种再生水中细菌的光复活能力相对磷酸盐缓冲溶液(PBS)中减弱,减弱程度在不同水样中有所不同。The effect of water quality on UV disinfection was studied using E. coli as testing bacteria. The result showed that UV could inactivate E. coli effectively and 4.41-1g reduction was achieved at the UV dose of 4 mJ/cm2. Ferric ion and humic acid and dissolved matter in reclaimed waters all had effects on light absorbance degree and UV transmittance of water sample, but no marked effect on inactivation rate of E. coli. At the range of particles concentration （0 -200 mg/L）, activated sludge particles and kaolin clay particles shielded E. coli to an insignificant degree relative to particle-free control conditions, while the particles present in W1 reclaimed wa- ter （2.6 mg/L） provided significant protection, showing a significant tailing. Humic acid enforced the photore- activation ability of UV-damaged E. coli, but in reclaimed water, the photoreactivation ability reduced to varying degrees according to different water samples.

关 键 词：再生水 紫外消毒 大肠杆菌 光复活 水质 

分 类 号：X703[环境科学与工程—环境工程]