城市污水厂侧路回收磷技术研究与工程示范  

Side-stream Phosphorus Recovery Technology in Urban Sewage Treatment Plant and Demonstration Project

作　　者：聂超[1] 马伟芳[1,2] 郭浩[2] 韩东梅[2] 刘树模 

机构地区：[1]北京林业大学环境科学与工程学院,北京100083 [2]北京市可持续发展促进会,北京100084 [3]北京中联环工程股份有限公司,北京100161

出　　处：《中国给水排水》2014年第21期82-86,共5页China Water & Wastewater

基　　金：北京市科技计划项目(Z111100058911003)

摘　　要：针对污水厂生物除磷效率不高,普遍采用生物除磷辅以化学除磷的方式,研究采用二沉池污泥侧路厌氧释磷,释磷污泥重新回到曝气池,释磷后的上清液进行磷回收,不仅提高了生物除磷效率,同时回收了宝贵的磷资源。分别考察了释磷时间、p H值、反应时间、物料配比等因素对磷回收的影响,结果表明,厌氧释磷的最佳停留时间为4 h,回收磷酸铵镁的最佳药剂组合为Mg Cl2和氨水,物料的最佳配比n(N)∶n(Mg)∶n(P)=5∶1.6∶1,最佳p H值=10,最佳搅拌速率为400 r/min。在太原市2×104m3/d的开发区污水处理厂建立了侧路回收磷系统,通过对所得沉淀产物进行电镜扫描及能谱分析,可知斜方型晶体为目标产物鸟粪石,产物中夹杂无明显晶形的未知物质;示范工程的生物除磷效率提高了20%,回收磷酸铵镁量为400 kg/d。The biological and chemical phosphorus removal methods were widely used because the biological phosphorus removal efficiency was not high in sewage treatment plants. Side-stream anaerobic phosphorus release from secondary sludge, returning the phosphorus release sludge to the aeration tank and recovering phosphorus from the supernatant could improve the efficiency of biological phosphorus re- moval and recover phosphorus resource. The effects of phosphorus release time, pH, reaction time and ratio of materials on phosphorus recovery were investigated. The optimal conditions were as follows： the retention time for anaerobic phosphorus release was 4 h, the chemicals for recovering magnesium ammoni- um phosphate wereMgCl2andNH3·H2O, n （N） ： n （Mg） ： n （P） =5 ： 1.6 ： 1, pHwas 10, and the stirring rate was 400 r/min. A side-stream phosphorus recovery system was constructed in Taiyuan WWTP. SEM-EDX analysis of the precipitation product showed that oblique square crystal was target product struvite in which there ere unknown amorphous substances. The biological phosphorus removal ef- ficiency in the demonstration project was increased by 20% , and the recovery of magnesium ammoniumphosphate was 400 kg/d.

关 键 词：侧路回收磷 磷酸铵镁 工程示范 

分 类 号：X703[环境科学与工程—环境工程]