胞外聚合物蓄磷能力及与生物除磷的关系  

On the relation between EPS phosphorus-adsorbing tendency and the bio-phosphorus removal

作　　者：韩玮[1,2] 袁林江[1] 柴璐[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西安科技大学地质与环境学院,西安710054

出　　处：《安全与环境学报》2012年第5期23-28,共6页Journal of Safety and Environment

基　　金：西安市科技局创新支撑计划项目(CXY09025)

摘　　要：为探明胞外聚合物(EPS)在生物除磷过程中的作用,采用人工模拟城市污水,对不同污泥龄(SRT)下厌氧/好氧(A/O)交替运行的SBR生物除磷系统的除磷效果进行监测,并对单位质量的活性污泥中所包含的总磷质量、EPS中吸附的总磷质量以及细胞吸收的总磷质量进行测定。结果表明,当SRT小于48 d时,A/O-SBR城市污水生物除磷系统均能取得良好的除磷效果,连续监测出水总磷质量浓度均小于0.5 mg/L,达到《城镇污水处理厂排放标准》的一级标准。EPS具有一定的蓄磷能力,单位质量的活性污泥中EPS含磷量(简称EPS含磷量)不超过10mgP/gVSS,而同质量的活性污泥中的细胞含磷量(简称细胞含磷量)最高可达38 mgP/gVSS。EPS含磷量不随SRT发生变化,SRT在12～48 d时,EPS含磷量约为10 mgP/gVSS;而细胞含磷量会随SRT发生变化,SRT在12～48 d时,细胞含磷量在20～38mgP/gVSS之间变化。城市污水处理厂的活性污泥中细胞含磷量始终大于EPS含磷量,水中的磷酸盐主要以聚磷颗粒的形式储存于细胞内。在一个厌氧/好氧交替的反应周期内,EPS含磷量并不是一直保持在10 mgP/gVSS,而是出现波浪形变化趋势,有时甚至可高达20 mgP/gVSS。这种波动能够调节聚磷菌(PAO)胞外磷酸盐浓度,有利于聚磷菌抵抗高磷酸盐负荷。但在反应结束时EPS含磷量又会恢复到反应开始前的水平。因此,EPS在生物除磷过程中主要起缓冲作用,是胞内聚磷合成的中转站。This paper takes it as its goal to introduce its study results on the relation between EPS phosphorus-adsorbing trend and the bio-phosphorus removal. For this purpose, we have first of all to make clear the role the extra-cellular polymeric substances （EPS） are playing in the biological phosphorus removing process. And that is why we have conducted a simulated research of the urban sewage, trying to monitor the phosphorus removal effect of the anaerobic/aerobic （A/O） alternating SBR biological phosphorus removing system under the different sludge retention periods （SRP）. In doing so, we have collected sufficient qualified activated sludge samples, observed and counted all the necessary phosphorus content in the unit mass sample, the EPS adsorbed phosphorus content and the phosphorus-accumulating bacteria（PAO） adsorbed phosphorus content. The results of our study show that, when the SRP is shorter than 48 days, the A/O-SBR biological phosphorus removing system is expected to achieve good removal effect. However, when the effluent total phosphorus concentrations are kept continuously less than 0.5 mg/L, it is expected to reach the optimal standard of the urban sewage treatment and ideal emission. In such a situation, the EPS adsorbed phosphorus content can store a certain amount of phosphorus, no more than 10 mgP/gVSS per gram of the activated sludge EPS adsorbed phosphorus content. And, if there is no change taking place with the EPS adsorbed phosphorus content, there will be 38 mgP/gVSS with per gram of activated sludge of cells of phosphorus content until the sludge retention time changes. However, when the SRT goes on till 12 to 48 days, the EPS adsorbed phosphorus content would be going up to 10 mgP/gVSS, which may lead to intra-cellular phosphorus content change, too. During this period, the intra-cellular phosphorus content would change to 20-38 mgP/gVSS. In addition, the intra-cellular phosphorus content would always remain greater than the EPS adsorbed content,thus keeping the phosphate mai

关 键 词：环境工程学 生物除磷 A O-SBR 污泥龄 胞外聚合物 

分 类 号：X703[环境科学与工程—环境工程]