A/O系统回流污泥磷的释放及好氧段对其的影响  

Release of Phosphorus from the Returned Sludge of A/O Biological Phosphorus Removal System: Effects of Aerobic Aeration Time and SRT

作　　者：刘伦[1,2] 袁林江 LIU Lun;YUAN Lin-jiang(Shaanxi Province Key Laboratory of Environmental Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Laboratory of Northwest Water Resources,Environment and Ecology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学陕西省环境工程重点实验室,陕西西安710055 [2]教育部西北水资源与环境生态重点实验室,陕西西安710055

出　　处：《中国给水排水》2019年第21期6-10,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51278406)

摘　　要：将城市污水处理厂污泥中的磷以化学沉淀的方式回收,既可回收资源又可减少磷的最终排放量。其中Phostrip工艺就是污泥磷回收的一种知名工艺,它通过对二沉池富含磷的污泥在回流到前端反应器前将其中的磷进行化学回收。回流污泥磷的释放会对侧流污泥磷的化学回收工艺产生重要的影响,但对此目前尚缺乏足够的研究。为此采用A/O反应器,研究了污泥停留时间以及前端曝气时间对侧流污泥磷释放的影响,探究了污泥磷释放的规律。结果表明:在侧流厌氧反应器中污泥仅释放出少量的磷,释磷混合液的日平均浓度仅为3.66 mg/L,远低于进水磷浓度(8mg/L);延长污泥厌氧释磷池的停留时间(5.5 h内)可在一定程度上提高磷的释放量,但5.5 h后效果不显著;在污泥摄磷阶段的曝气时间分别为1、2、4 h情况下,在厌氧环境中释磷量分别为6.39、6.74、5.79 mg/gMLSS,表明缩短好氧阶段曝气时间有助于提高侧流磷释放量。If the phosphorus in the sludge of municipal wastewater treatment plants can be recovered by chemical precipitation,phosphorus discharge will be reduced and its resources recycling can be achieved simultaneously.The Phostrip is a well-known chemical phosphorus recovery process from activated sludge in settling tank before returning to the front of the prcocess.The phosphorus release of the side-stream sludge has an important effect on the operation of the process.The influence of sludge retention time and aeration time in the front tank on phosphorus release was studied in an A/O system.The results showed that a small amount of phosphorus release in side-stream was observed with the daily average concentration of 3.66 mg/L,which was less than that of 8 mg/L in influent.Prolonging anaerobic retention time of the sludge improved the release of phosphorus to some extent within 5.5 h,but could not achieve more after that.The release of phosphorus in the anaerobic environment by the phosphorus-rich sludges experienced three different aeration time,i.e.,1 h,2 h and 4 h,were 6.39 mg/gMLSS,6.74 mg/gMLSS and 5.79 mg/gMLSS,respectively,indicating that the reducing aeration time could effectively improve the phosphorus release.

关 键 词：A/0生物除磷系统 化学磷回收 富磷污泥 污泥停留时间 磷释放 

分 类 号：TU992[建筑科学—市政工程]