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Chemcial Industry and Engineering 2024, Vol. 41 Issue (6) :128-135    DOI: 10.13353/j.issn.1004.9533.20230832
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Investigation on influencing factors of crystallization characteristics of phosphorus-based minerals in urine diversion system
YAN Zhengxu1, CHEN Jing2, YANG Zhen3, CHENG Shikun4, LI Zifu4
1. China Urban Construction Design & Research Institute Co., Ltd., Beijing 100120, China;
2. Engineering Design and Research Institute, China Architecture Design & Research Group, Beijing 100044, China;
3. School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing Normal University, Nanjing 210023, China;
4. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

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Abstract The deposition of phosphorus-based minerals in urine diversion system has been one of the main challenges to establish large-scale urine diversion system. The crystallization characteristics of phosphorus-based minerals were systematically evaluated in this paper, and the effects of various factors such as pH, calcium-magnesium molar ratio, citrate, and rotational speed on the crystallization characteristics of phosphorus-based minerals were studied. The results indicated that the pH and the calcium-magnesium molar ratio were the main factors affecting the crystallization characteristics of phosphorus-based minerals in urine. The increase in the initial pH resulted in a decrease in the purity of struvite in the crystalline substance. When the initial pH increased from 7.0 to 8.0, the initial supersaturation index of HAP[Ca10(PO4)6(OH)2], OCP[Ca4H(PO4)3·3H2O(s)], ACP[Ca3(PO4)2] and TCP[Ca3(PO4)2] increased significantly, resulting in a rapid increase in the proportion of Ca-P compounds in the crystalline substance. The growth process of struvite crystals was influenced by Ca-P compounds, which resulted in the transformation of crystal morphology from regular polyhedral crystals to irregularly shaped crystals. And the crystal surface was covered by a large number of amorphous Ca-P compounds. Compared with calcium and magnesium ions, phosphate is "excessive" in urine. There was no obvious competition relationship between Ca-P compounds and Mg-P compounds. Calcium ions mainly affected the growth process of struvite crystals. With the increase of the initial calcium-magnesium molar ratio, the proportion of struvite crystals in the crystalline substance decreased, which was mainly due to the formation of more Ca-P compounds in the yellow water as the concentration of calcium ions increased.
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Articles by authors
YAN Zhengxu
CHEN Jing
YANG Zhen
CHENG Shikun
LI Zifu
Keywords： phosphorus-based minerals   urine diversion   spontaneous precipitation   crystallization characteristics     
Received 2023-12-18;
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YAN Zhengxu, CHEN Jing, YANG Zhen, CHENG Shikun, LI Zifu.Investigation on influencing factors of crystallization characteristics of phosphorus-based minerals in urine diversion system[J]  Chemcial Industry and Engineering, 2024,V41(6): 128-135
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