城市污泥特性及真空抽滤浓缩实验研究  

Characteristics of Municipal Sludge and Vacuum Filtration Thickening Process

作　　者：乔玮[1] 王伟[1] 尹可清[1] 

机构地区：[1]清华大学环境科学与工程系,北京100084

出　　处：《环境科学》2008年第4期1109-1113,共5页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2006AA06Z384)

摘　　要：对某城市6座污水处理厂污泥做真空抽滤浓缩,并对污泥特性进行了研究.结果发现,污泥中每g固体(TS)相当于1 g化学需氧量(COD);每g挥发性固体(VS)相当于1.5 g COD,其线性回归R2分别为0.931 4和0.922 8.污泥中携带的COD占污水去除COD总量的60%.污泥有机物组成表现为高蛋白质低脂肪特征.调查发现传统重力浓缩污泥浓度普遍低于3.3%,浓缩效率低.在真空度-34.7 kPa下的真空抽滤实验表明,浓缩速率受污泥种类、浓度、PAM分子量以及添加量的影响.其中,污泥种类对浓缩速率影响较大,初沉污泥干固体抽滤速率为31 kg/(m2.h),剩余污泥速度低于15 kg/(m2.h),重力浓缩污泥的抽滤浓缩速度达到43 kg/(m2.h).抽滤液悬浮固体浓度普遍低于1.5 g/L.It was found that sludge total solid（TS） concentration was equal to chemical oxygen demand（COD）,while volatile solid（VS） was 1.5 times of COD concentration.R^2 of linear regression of TS and VS with COD was0.9314 and0.9228 respectively.Total COD in sludge was approximately 60% of that removed in water treatment process.Sludge contained high level protein and low fat.The TS of present gravity thickening sludge was universally lower than 3.3%.Efficiency of vacuum filtration process was determined by sludge type,sludge solid concentration,PAM molecular weight and PAM addition dose.Under-34.7 kPa pressure,sludge dry solid filtration thickening rate of primary sludge was up to 31kg/（m^2·h）. While,for wasted actived sludge the rate was lower than 15kg/（m^2·h）. Rate of gravity thickening sludge was up to 43kg/（m^2·h）. TS of vacuum filtrate were lower than 1.5g/L.

关 键 词：污泥特性 真空抽滤 浓缩 

分 类 号：X705[环境科学与工程—环境工程]