活性污泥对病毒的生物吸附特性

Biosorption Characteristics of f2 Bacteriophage onto Activated Sludge

针对污水处理过程中可能存在的病原微生物对人体健康的风险,以f2噬菌体为模型病毒,采用静态吸附方法,研究病毒在活性污泥上的生物吸附特性及其影响因素,以期了解病毒在活性污泥处理系统中固液两相体系的分配规律.结果表明,活性污泥对病毒的吸附速率快,吸附量大,在120 min时即能达到吸附平衡,平衡吸附率高达96%以上,对病毒的去除效果较为理想;该吸附符合Freundlich吸附等温式,且吸附率随着病毒浓度的增加而呈现出下降趋势;另外,pH值、金属阳离子浓度及有机物浓度均可显著影响病毒在活性污泥上的吸附.

A series of static adsorption experiments by activated sludge were conducted for virus removal with f2 bacteriophage,which was seeded with a high concentration as surrogates for human enteric viruses.Adsorption kinetics had shown equilibrium conditions were established in some 120 minutes and the activated sludge could get rid of more than 96% f2 bacteriophage,with 85% of total adsorption occurring in less than an hour.Freundlich isotherm model adequately described the adsorption which indicated that the removal mechanism of virus is based on a multilayer adsorption in such a heterogeneous aqueous solution system.Adsorption capacity was found to vary with pH value,metallic cation concentration and organic content in wastewater,demonstrating the importance of these parameters for the removal of virus.