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| Influence of ion cluster on phosphorous recovery efficiency in CaP crystallization system |
| LI Yi-nan1,2, NIE Xiao-bao1,2, WAN Jun-li1,2, JIANG Heng3, WANG Guo-qi1,2, OU Yang-shuai1,2, WANG Zheng-bo1,2 |
1. School of Hydraulic & Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China;
3. Hunan Water Resources and Hydropower Survey, Design, Planning and Research Co., Ltd, Changsha 410007, China |
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Abstract 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.
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Received: 20 March 2024
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