摘要
构建了以25μm孔径尼龙网为粗孔材料的动态膜生物反应器处理模拟生活污水,通过阶跃法确定了动态膜的临界通量,设计了三种渗透通量水平(亚临界、临界和超临界通量)以研究其对动态膜污染物去除性能和膜污染的影响。结果表明,动态膜的临界通量在60~70 L/m^(2)·h之间,调整渗透通量对污染物的去除效果没有显著影响(COD和总氮的去除率均在90%以上);提高渗透通量导致了清洗频率增加,在长期过滤过程中可能会导致出水水质下降。生物活性分析发现,亚临界通量可能提高动态膜的硝化和反硝化速率。进一步分析胞外聚合物的含量发现,亚临界通量下动态膜滤饼层中的多糖含量更高,显著增加了滤饼层阻力,将清洗频率降至最低;超临界通量下动态膜滤饼层中可溶性微生物产物(SMP)和松散结合的胞外聚合物(LB-EPS)中的蛋白质和多糖的比值偏高,这可能会引起动态膜的快速污染。基于亚临界通量的反应器工况设计有助于系统优化运行。
A dynamic membrane bioreactor was constructed using 25μm pore diameter nylon mesh as the coarse pore material to treat simulated domestic sewage.The critical flux of the dynamic membrane was determined by the standard flux-step method,and three permeation flux levels(subcritical,critical,and supercritical flux)were designed to study their effects on the removal of contaminants and membrane fouling in the dynamic membrane.The results show that the critical flux of the dynamic membrane is between 60-70 L/(m^(2)·h),and adjusting the permeation flux has no significant effect on the removal of pollutants(the removal rates of COD and total nitrogen are both over 90%);increasing the permeation flux leads to an increase in cleaning frequency,which may result in a decrease in the quality of the effluent in the long-term filtration process.Biological activity analysis found that subcritical flux may increase the nitrification and denitrification rates of the dynamic membrane.Further analysis of the content of extracellular polymers revealed that the polysaccharide content in the dynamic membrane filter cake layer was higher under subcritical flux,significantly increasing the resistance of the filter cake layer and reducing the cleaning frequency to a minimum.In the dynamic membrane filter cake layer under supercritical flux,the ratio of proteins and polysaccharides in soluble microbial products(SMP)and loosely bound extracellular polymers(LB-EPS)was high,which may cause rapid contamination of the dynamic membrane.Reactor conditions designed based on subcritical flux can help optimize the system's operation.
作者
梁梓豪
吴珊
姚婧梅
阳春
周忠波
韩乐
LIANG Zihao;WU Shan;YAO Jingmei;YANG Chun;ZHOU Zhongbo;HAN Le(Key Laboratory of Eco-environment of Three Gorges Reservoir Area,Ministry of Education,College of Environment and Ecology,Chongqing University,400044;Department of Environmental Science and Engineering,College of Resources and Environment,Southwest University,400715:Chongqing,China)
出处
《水处理技术》
北大核心
2026年第3期107-112,共6页
Technology of Water Treatment
基金
国家重点研发计划项目(2022YFC3203402)。
关键词
动态膜
膜生物反应器
临界通量
胞外聚合物
膜污染阻力
dynamic membrane
membrane bioreactor
critical flux
extracellular polymeric substances
fouling resistance
