化学沉淀法回收污泥中氮磷的影响因素研究  

Impact Factors on Recovery of Nitrogen and Phosphorus by Chemical Precipitation in Sludge

作　　者：员建[1] 苑宏英[1] 陈轶[1] 池勇志[1] 

机构地区：[1]天津城市建设学院环境与市政工程系,天津市水质科学与技术重点实验室,天津300384

出　　处：《环境科学与技术》2011年第6期148-151,共4页Environmental Science & Technology

基　　金：天津市高等学校科技发展基金计划项目(20060521);天津市自然科学基金项目(08JCYBJC13200)

摘　　要：污水处理厂污泥上清液中富集着较高浓度溶解性的氮磷,将此部分氮磷形成磷酸盐沉淀(如磷酸氨镁、磷酸钙、磷酸铝等)加以回收利用,受到各种因素的影响。文章以正交试验得出的影响因素为基础,深入研究了pH、初始PO43--P的浓度、Mg/P和反应时间对某污水厂污泥上清液中磷酸氨镁沉淀法回收氮磷的影响。结果表明:pH是影响污泥上清液中氮磷回收的关键因素,最佳pH范围9.5～10.5,控制pH=10.0,初始PO43--P浓度在78.20 mg/L以上,无外加镁剂,搅拌时间为10 min,PO43--P和NH4+-N回收率分别可达到90%和20%。Sludge supernatant of wastewater treatment plant contains a great quantity of soluble nitrogen and phosphorus.Many parameters affected on the recovery and reuse process of phosphorus precipitation including magnesium ammonium phosphate,calcium phosphate and aluminum phosphate.Based on the results of orthogonal experiment,effect of pH,initial PO43——P concentration,Mg/P and reaction time on recovery of nitrogen and phosphorus for magnesium ammonium phosphate precipitation in sludge supernatant were studied.Results showed that pH was the key parameter,under the optimal condition of nitrogen and phosphorus recovery for precipitation in sludge supernatant as pH 9.5~10.5,initial PO43——P concentrations over 78.20 mg/L,no plus magnesium and 10 min of reaction time,the recovery rate of NH4＋-N and PO43——P was 90% and 20% respectively.

关 键 词：污泥上清液 氮磷 磷酸氨镁沉淀法 

分 类 号：X703.1[环境科学与工程—环境工程]