不同活性污泥中污泥质量浓度对沉降性的影响  

Impacts of mixed liquor suspended solids on settle ability in different activated sludge

作　　者：彭赵旭[1] 彭永臻[1,2] 于振波[1] 刘旭亮[1] 柴同志[1] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090 [2]北京工业大学环境与能源学院,北京100022

出　　处：《哈尔滨商业大学学报（自然科学版）》2012年第1期23-26,48,共5页Journal of Harbin University of Commerce：Natural Sciences Edition

基　　金：高等学校博士学科点专项科研基金(20091103110011);北京市属高等学校人才强教计划资助项目(00500054R7001)

摘　　要：为了考察污泥质量浓度对活性污泥沉降性的影响,采用100 mL量筒进行批沉降试验,分别研究了不膨胀污泥、丝状菌膨胀污泥和非丝状菌膨胀污泥在不同质量浓度下的沉降性能.结果表明,当质量浓度过低时,所有污泥都具有沉速快,泥水分界面模糊,沉后上清液浑浊的特性.当质量浓度升高时,沉速都会减慢,且泥水分界面分别因拥挤沉淀(不膨胀污泥)和交联分离(膨胀污泥)作用而变得清晰.当用污泥沉降比(SV)来表征沉降性时,不膨胀污泥对质量浓度变化敏感,而膨胀污泥则一直保持在90%以上.当用污泥容积指数(SVI)来表征沉降性时,对不膨胀污泥取沉降60 min的SVI可消除质量浓度的影响.对膨胀污泥需要设定一个特定质量浓度下的标准值,其他质量浓度下的SVI按照反比例关系换算到该质量浓度下再进行比较.In order to investigate the impacts of mixed liquor suspended solids （MLSS） concentration on sludge settleability, batch settling tests were carried out by 100 mL cylinders. The sludge settleability under different MLSS in non-bulking sludge, filamentous bulking sludge and non-filamentous bulking sludge dere investigated. The results show that, when MLSS was thin, all kinds of sludge had the characteristics of quick settling rate, fuzzy solid/ liquid interface and tubid supernatant. When MLSS was dense, the settling speed would decrease. Meanwhile, the solid/liquid interface was changing clearer by the hindered settling （non-bulking sludge） and crosslinked separation （bulking sludge）, respectively. When SV was used to describe sludge settleability, it was very sensitive to MLSS in non-bulking sludge, while it kept above 90% all the time in bulking sludge. When SVI was used to de- scribe sludge settleabi!ity, the impacts of MLSS can be eliminated by calculating after settling 60 mins in non-bulking sludge. In bulking sludge, a standard SVI value under a certain MLSS should be set, the SVI under other MLSS could be conversed to the value under this MLSS according to inversely proportional relationship to compare sludge settleability.

关 键 词：活性污泥 丝状菌膨胀 污泥沉降性 拥挤沉淀 交联分离 

分 类 号：X703[环境科学与工程—环境工程]