中国环境科学

作者：李祎楠, 聂小保, 万俊力, 姜恒, 王郭起, 欧阳帅, 王正博

单位：1. 长沙理工大学水利与环境工程学院, 湖南 长沙 41014;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

关键词：CaP结晶,磷回收,离子簇,成簇,团聚

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)

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.

来源：2024年第11期

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