营养失衡下的分层分质EPS对异型膨胀污泥及其沉降性差异影响  

Different effect of EPS in layers and its components on settleability of heterogenic bulking activated sludge with condition of nutritional imbalance

作　　者：胡小兵[1,2] 韦京云 林睿 汪坤 常静[1] 顾娴静 张琳 钟梅英[1] HU Xiao-bing;WEI Jing-yun;LIN Rui;WANG Kun;CHANG Jing;GU Xian-jing;ZHANG Lin;ZHONG Mei-ying(College of Architectural Engineering,Anhui University of Technology,Ma’anshan 243032,China;Engineering Research Center of Water Purification and Utilization Technology Based on Biofilm Process,Ministry of Education,Ma’anshan 243032,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002 [2]生物膜法水质净化及利用技术教育部工程研究中心,安徽马鞍山243032

出　　处：《中国环境科学》2019年第12期5110-5118,共9页China Environmental Science

基　　金：国家自然科学基金项目(51878001)

摘　　要：为探索EPS对膨胀污泥沉降性的影响,通过减少进水P源、N源的方式培养异型膨胀活性污泥,分析不同层、不同组分EPS对异型膨胀污泥沉降性影响.结果表明:异型膨胀(非丝状菌粘性膨胀、丝状菌膨胀)活性污泥EPS多糖组分Total-PS、中层组分(L-PS)含量均高于正常污泥.非丝状菌粘性膨胀污泥EPS各层多糖含量高于丝状菌膨胀污泥,而各层蛋白质(PN)含量均低于丝状菌膨胀污泥.非丝状菌粘性膨胀污泥Total-EPS((229±94) mg/g MLSS)、PS/PN值不仅显著高于正常活性污泥((86±16)mg/g MLSS),也高于丝状菌膨胀污泥(108±30)mg/gMLSS).非丝状菌粘性膨胀污泥EPS多糖总量Total-PS、蛋白质总量Total-PN越高,SVI值越大,污泥沉降性越差,越易膨胀,且EPS蛋白质组分对污泥膨胀作用大于多糖;从不同层EPS看,松散外层(S层)EPS对非丝状菌粘性膨胀作用最大(S-PN与SVI值相关性最大,r为0.881,P<0.05),是主要影响因子.丝状菌膨胀污泥,除了内层紧密型T-PN对SVI值影响较大外,其他各层、各组分EPS含量与SVI均呈微弱负相关.To explore the different effects of extracellular polymeric substance(EPS) on settleability of bulking sludge,the influent conditions changed with shortage of elements P and N for culture different bulking sludges,the EPS in different layers and their components in bulking sludges were analyzed.The results showed that no matter in the non-filamentous viscous bulking sludge or in the filamentous bulking sludge,the contents of Total-PS,of EPS in the outer layer(S-PS、S-PN),and of EPS in the middle layer(L-PS)were higher than those in the normal activated sludge.Polysaccharide content in EPS of all layers in non-filamentous viscous bulking sludge was more than that in filamentous bulking sludge,while the contents of PN of all layers in non-filamentous viscous bulking sludge were lower than those in filamentous bulking sludge.Total-EPS((229±94) mg/g MLSS) in non-filamentous viscous bulking sludge was higher than that in normal activated sludge((86±16) mg/g MLSS) and filamentous bulking sludge((108±30) mg/g MLSS).The higher the contents of Total-P,Total-PN in non-filamentous viscous bulking sludge were,the bigger SVI value was and the worse sludge settleability was.Protein had more great effect on the sludge settleability than polysaccharide did.In the view of EPS in layers,the EPS in incompact outer layer(layer S) was the key to the formation of non-filamentous viscous bulking sludge(value of S-PN and SVI had the greatest correlation,r=0.881,P<0.05).Total contents of EPS components,the EPS contents in the different layers but tightly bond T-PN were all weak-negative correlated with SVI.

关 键 词：异型膨胀污泥 分层胞外聚合物 蛋白质组分 多糖组分 沉降性能 

分 类 号：X703[环境科学与工程—环境工程]