镧改性粉煤灰合成沸石同步脱氨除磷研究.pdfVIP

中国环境科学 2011,31(7) ：1152~1158 China Environmental Science 镧改性粉煤灰合成沸石的同步脱氨除磷研究 1 2* 1,3 2 1 1 王 宇 ,谌建宇 ,李小明 ,骆其金 ,杨 麒 ,蒋 丽 (1.湖南大学环境科学与工程学院,湖南 长沙 410082 ；2.环境保护部华南环境科学研究所,广东 广州 510655 ；3.广西大学环境学院,广西 南宁 530004) 摘要：以火电厂固废粉煤灰为主要原料,采用改良水热法研制合成了低成本的 P 型沸石,对其进行了稀土镧改性处理, 以强化其脱氮除磷能 力.实验研究了改性镧离子浓度、投加量、pH 值对同步去除氨氮和磷的影响;运用 XRD 和 SEM 分析技术对合成沸石进行了表征.结果表明, 在改性镧离子浓度 0.5% 、pH 值为 4~8 、投加量为 10g/L 时,改性后的合成沸石对氨氮和磷的去除率分别达到 90%,95% 以上.改性后的合成 沸石对氨氮及磷的吸附动力学数据符合伪二级方程.Langmuir 方程能更好地描述氨氮及磷在改性合成沸石上的等温吸附行为,氨氮和磷的 Langmuir 最大吸附量分别为 3.94,1.65mg/g. 关键词：粉煤灰；P 型沸石；氮磷；镧离子改性 中图分类号：X703.5 文献标识码：A 文章编号：1000-6923(2011)07-1152-07 Stimultaneous removal of ammonium and phosphate in waste water by La-modified synthetic zeolite from coal fly ash. WANG Yu1 2* 1,3 2 1 1 , CHEN Jian-yu , LI Xiao-ming , LUO Qi-jin , YANG Qi , JIANG Li (1.College of Environmental Science and Engeering, Hunan University, Changsha 410082,China；2.South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China ；3.College of Environment,Guangxi University, Nanning 530004, China). China Environmental Science, 2011,31(7)：1152~1158 Abstract ：The low-cost P zeolite was synthesized from coal fly ash of power plants through the modified hydrothermal process, and further treated through the tombarthite La modification to improve its ammonium and phosphate removal efficiency. The experiments focused on testing the impact of modified lanthanum concentration, dosage, pH on ammonium and phosphate removal. X-ray diffraction (XRD) and scanning electronic microscope (SEM) were applied to observe the physical-chemical characteristics. Removal rate of ammonium and phosphate were 90%, 95% respectively under the