聚合硅酸镧絮凝剂的制备及其在高浊水中的深度除磷应用  

Synthesis of polymerized lanthanum silicate flocculant for deep phosphate removal in high turbidity water

作　　者：李文涛 吴晓梅 郑炎然 龚美佳 方宜宜 李杨 肖峰 夏志林 钟润生[1] LI Wentao;WU Xiaomei;ZHENG Yanran;GONG Meijia;FANG Yiyi;LI Yang;XIAO Feng;XIA Zhilin;ZHONG Runsheng(Shenzhen Institute of Information Technology,Shenzhen 518172,China;North China Electric Power University,Beijing 102206,China;Shenzhen Changlong Technology Industry Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]深圳信息职业技术学院,深圳518172 [2]华北电力大学,北京102206 [3]深圳市长隆科技有限公司,深圳518000

出　　处：《环境保护科学》2024年第5期150-156,162,共8页Environmental Protection Science

基　　金：深圳市校企合作项目(SZIIT2021KJ026);深圳市科技计划项目(20220820003755001)。

摘　　要：针对高浊污水深度处理中聚合氯化铝除磷低效问题,设计出一种新型高效除磷剂-聚合硅酸镧(PLSC)。样品表征数据显示,聚合硅酸分子结构中部分硅被镧取代形成La-OH和Si-OLa基团,对磷去除效果进一步强化。实验数据结果显示,在高浊水中PLSC深度除磷时pH、温度、离子强度等适用范围广,呈现出高效除磷行为。利用FTIR、Zeta电位和SEM-EDS手段分析PLSC除磷机理,探讨发现PLSC表面La-OH对磷具有极强吸附作用,其中La与P络合方式主要以双齿双核为主。当高岭土存在时La与P络合方式由双齿双核向单齿单核转变,促进PLSC对磷去除效果。In view of the low efficiency of phosphate removal by polyaluminum chloride in the advanced treatment of high turbidity wastewater,a new efficient phosphorus removal agent-polymerized lanthanum silicate(PLSC),was designed.The characterization data showed that the part of silicon atoms in the molecular structure of polymerized silicic acid was replaced by lanthanum atoms to form the La-OH and Si-O-La groups,which further enhanced the phosphate removal efficiency.The experimental results showed that the pH,temperature and ionic strength of PLSC deep phosphorus removal in high turbidity water had a wide application range,showing high efficiency phosphorus removal behavior.The mechanism of phosphate removal by PLSC was analyzed by FTIR,Zeta potential and SEM-EDS,indicating that the La-OH group on the PLSC surface had a strong adsorption interaction on the phosphate,and the complexation mode of La-P was mainly double-toothed and double-nucleated.In the presence of kaolin,the complexation mode of La-P changed from two-tooth two-core to single-tooth single-core,which promoted the phosphate removal by PLSC.

关 键 词：聚合硅酸镧 絮凝 深度除磷 高岭土 高浊水 

分 类 号：X703[环境科学与工程—环境工程] TQ421[化学工程]