CaP结晶体系中离子簇对磷回收效果的影响  

Influence of ion cluster on phosphorous recovery efficiency in CaP crystallization system

作　　者：李祎楠 聂小保[1,2] 万俊力 姜恒[3] 王郭起 欧阳帅 王正博 LI Yi-nan;NIE Xiao-bao;WAN Jun-li;JIANG Heng;WANG Guo-qi;OU Yang-shuai;WANG Zheng-bo(School of Hydraulic&Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha 410114,China;Hunan Water Resources and Hydropower Survey,Design,Planning and Research Co.,Ltd,Changsha 410007,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]洞庭湖水环境治理与生态修复湖南省重点实验室,湖南长沙410114 [3]湖南省水利水电勘测设计规划研究总院有限公司,湖南长沙410007

出　　处：《中国环境科学》2024年第11期6194-6200,共7页China Environmental Science

基　　金：湖南省环保科研项目(HBKT-2022001);水利部重大科技项目(SKS-2022079);郴州国家可持续发展议程创新示范区建设省级专项(2022sfq51);长沙理工大学水利与环境工程学院研究生“双一流”建设项目(2022040212)。

摘　　要：为提高污水磷酸钙(CaP)结晶的磷回收效果,对CaP结晶体系中的离子簇进行了研究,探讨离子簇成簇和团聚对磷回收的影响.结果表明,采用Ca离子选择电极原位监测结晶体系游离态Ca浓度,结合结晶态P含量和产物Ca/P物质的量比的异位分析结果,可以实现对离子簇的定量分析.该方法操作简单,准确度较高.CaP结晶过程分为初期的离子簇成簇和团聚(0~20s)、中期的离子簇成簇(20~3000s)和后期的离子簇团聚(3000~7200s),3个阶段的磷回收率分别为11.1%、3.9%和28.5%.磷的回收主要是通过离子簇团聚实现.通过投加晶种,调控CaP离子簇的成簇和团聚过程,有望提升污水CaP结晶的磷回收效果.To improve the P recovery efficiency of CaP crystallization from wastewater,ion cluster presented in CaP crystallization system and its effects on P recovery were studied.The results indicate that in-situ monitoring of free Ca concentration with selective electrode,combined with ex-situ analysis results of crystalline P and Ca/P molar ratio in CaP,can achieve quantitative analysis of ion clusters in CaP crystallization system.Such method is easy to be operated and has high accuracy.The CaP crystallization process can be divided into three stages:initial ion cluster formation and aggregation(0~20s),mid-term ion cluster formation(20~3000s),and later ion cluster aggregation(3000~7200s),of which the P recovery rates are 11.1%,3.9%,and 28.5%,respectively,indicating the main P recovery of achieved by ion cluster aggregation.The introduction of crystal seeds into CaP crystallization system of wastewater can regulating the clustering and aggregation process of CaP ion clusters,therefore improve the P recovery performance.

关 键 词：CaP结晶 磷回收 离子簇 成簇 团聚 

分 类 号：X703.1[环境科学与工程—环境工程]