磷酸铵镁结晶法回收牛粪厌氧消化液中氮、磷  

Magnesium Ammonium Phosphate Crystallization in Recovering Nitrogen and Phosphorus from Cow Manure Anaerobic Digestate

作　　者：公维佳[1] 常素青[1] 罗立娜[1] 邵俊达 王田田[1] 邹杰鑫 

机构地区：[1]东北农业大学工程学院,黑龙江哈尔滨150030

出　　处：《中国给水排水》2016年第11期105-108,113,共5页China Water & Wastewater

基　　金：教育部高等学校博士学科点专项科研基金资助项目(20132325120006);东北农业大学博士启动基金资助项目(2012RCB72);东北农业大学青年才俊项目(14QC35);黑龙江省大学生创新创业训练计划项目(201510224022)

摘　　要：以牛粪厌氧消化液为研究对象，选用MgCl2·6H2O和Na，HPO4·12H2O为沉淀剂，进行磷酸铵镁（MAP）结晶试验，研究了氮磷比、镁磷比、pH值、反应温度和搅拌速度对磷酸铵镁结晶过程的影响；并利用扫描电镜（SEM）、X射线衍射（XRD）对产物进行表征。结果表明，当氮磷比为1．2、镁磷比为1．0、pH值在8．5～10．5之间时，氮的回收率均在75．0％以上，磷的回收率可达99．0％，溶液中剩余PO^34--P浓度均在8．0mg／L以下。此外，MAP结晶法可同步去除消化液中的部分悬浮物；而提高反应温度和搅拌速度不能明显增加氮、磷的回收率。MgC12 · 6H2O and Na2HPO4 · 12H2O were chosen as precipitants to conduct magnesi- um ammonium phosphate （MAP） crystallization experiments for cow manure anaerobic digestate. The effects of N/P ratios, Mg/P ratios, pH, temperature and stirring speed on the MAP crystallization were investigated. The properties of crystallized products were characterized using scanning electron microsco- py （SEM） and X-ray diffraction （XRD）. The results showed that the recovery rates of nitrogen and phosphorus were over 75.0% and 99.0% respectively when the N/P ratio, Mg/P ratio and the pH value were 1.2, 1.0 and 8.5 to 10.5 respectively, with residual PO43- - P concentration of below 8.0 mg/L. MAP crystallization could also remove suspended matters from the digestate. The recovery rates of nitro- gen and phosphorus could not be improved significantly by increasing temperature and stirring speed.

关 键 词：牛粪 厌氧消化液 磷酸铵镁 氮磷回收 

分 类 号：X713[环境科学与工程—环境工程]