重金属对鸟粪石法回收的沉淀物的组成和晶形的影响  

The Effect of the Heavy Metal on Composition/Crystal Shape of Precipitate that Recovery from Wastewater by Struvite

作　　者：黄颖[1] 

机构地区：[1]华侨大学材料科学与工程学院,福建泉州362011

出　　处：《化学工程与装备》2008年第3期21-25,共5页Chemical Engineering & Equipment

摘　　要：利用氯化镁为沉淀剂,以磷酸铵镁沉淀的形式回收废水中的磷。探讨当废水中含有镍、铅、镉、铬这几种重金属时,生成的沉淀物的组成和晶形。沉淀物采用元素分析(ICP)、扫描电镜(SEM-EDS)进行分析,结果表明:当模拟废水中镍、铅、镉、铬的浓度由国家二级排放标准的一倍增大为八倍时,其生成的沉淀物均为斜方形晶体,晶型未受到废水中重金属化合物沉淀的影响;当废水中重金属的浓度为一倍时,沉淀物中镍、铅和镉分别约超标19倍、9倍和17倍;为八倍时,则分别约超标115倍、15倍和68倍,但铬都未超标。Using magnesium salt as setting agent, recovered phosphorous by MAP precipitate from synthetic wastewater, then study the composition and crystal shape of the precipitate when the heavy metal such as Ni、Pb、 Cr and Cd in the wastewater. The precipitates were analyzed by ICP and SEM-EDS. According to the national wastewater discharge standard level 2, when the concentrate of heavy metal in the wastewater is become from a time to eight times than it,the crystal shape of the precipitate is orthorhombic shape; w...

关 键 词：重金属 鸟粪石 沉淀物 组成 晶形 

分 类 号：X703[环境科学与工程—环境工程]