长泥龄污水生物除磷系统的除磷效果  

Effects of sludge retention time-length on the biological 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17-22,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);西安科技大学青年教师培育基金项目(200816)

摘　　要：为保证磷的去除率,城市污水处理厂生物除磷系统污泥龄一般控制在15 d左右。污泥龄越短,剩余污泥排放量越大,污泥处理费用越高。为探明长泥龄污水生物除磷系统的除磷效果及其作用机理,采用厌氧/好氧(A/O)交替运行的SBR反应器,以无水乙酸钠、葡萄糖、可溶性淀粉、蛋白胨为混合碳源,模拟城市污水处理系统,对污泥龄分别为12 d、20 d和48 d的生物除磷系统出水总磷质量浓度进行连续监测,研究污泥龄与胞内聚合物PHB(聚羟基丁酸)和PHV(聚羟基戊酸)质量比的关系。结果表明,对于进水COD为450 mg/L,总磷质量浓度达8 mg/L的城市生活污水生物除磷系统,由于碳源充足,污泥龄达到48 d仍能保证出水总磷质量浓度长期稳定达标,长泥龄不会影响除磷效果。由于我国生活污水水质的变化,城市污水处理厂最佳污泥龄约为48 d。污泥龄对聚磷菌体内的PHA(聚羟基烷酸)质量比及组成有重要影响。随着污泥龄的增长,PHA总量增加,聚磷菌得到了更多的吸磷驱动力,好氧时间不断减少,除磷效率不断增加。随着污泥龄的增长,聚菌体内的PHV质量比增加,而PHB质量比基本不变,因此PHB在PHA中占的比例有所下降。This paper is inclined to introduce our research results of the influence of the sludge retention time on the biological phosphorus removing efficiency. As we know, the urban sewage treatment plant sludge retention time is the key factor to ensure the efficiency of phosphorus removal, whose retention time is usually 15 days for the general biological phosphorus removal system. In addition, the shorter the sludge retention time and the greater the amount of surplus sludge discharge, the higher the sludge treatment cost would be. That is why we have investigated the biological phosphorus removal rate by using the urban sewage treatment system with longer sludge retention time and the SBR reactor by anaerobic/aerobic （A/O） alternate operation to simulate the urban sewage treatment system while taking the anhydrous sodium acetate, soluble starch, glucose, peptone as the carbon source mixture. As we know, if the sludge retention time were 12 days, 20 days and 48 days, we should keep monitoring the total effluent phosphorus concentration of the removal process while exploring the relation among the sludge retention time, the poly-＆beta;-hydroxyvalerate （PHB） and the poly-＆beta;-hydroxyvalerate （PHV） content. From the test results of ours it can be concluded that, on the condition when the effluent COD concentration reached 450 mg/L, the total phosphorus concentration could reach 8 mg/L in the sewage biological phosphorus removing system, if the carbon source of the rural sewage were enough. However, when the sludge retention time reaches 48 days, the total effluent phosphorus concentration can also be expected to reach the urban sewage treating emission standard steadily, for it can be found that the retention time prolonging did not influence the phosphorus removal efficiency, it also helps to reduce the surplus sludge discharge. Moreover, with the change of China＆rsquo;s urban sewage water quality, it tends to be optimal to prolong its urban sludge retention time till about 48day, which is actually

关 键 词：环境工程学 强化生物除磷 污泥龄 聚羟基烷酸 聚羟基丁酸 聚羟基戊酸 

分 类 号：X703[环境科学与工程—环境工程]