We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Influences of changes in pH, temperature, and particle size on surface reaction resistance and diffusion resistance in the struvite dissolution process.
- Authors
Chen, Guangyuan; Zhang, Meng; Zhou, Tong; Ding, Zhongxiang; Tang, Haiying; Ji, Yuanhui; Wang, Changsong
- Abstract
Struvite (MgNH 4 PO 4 ·6 H 2 O,MAP), a type of high-quality, slow-release fertilizer, is the main component of urinary stones in animals and humans and causes scale formation in industrial pipes. Therefore, MAP dissolution is an important research topic. Herein, MAP dissolution experiments are performed and a thermodynamic model is developed to evaluate the influences of pH, temperature (T), and particle size (P s) on surface reaction resistance (1/k s) and diffusion resistance (1/k d). The results show that MAP solubility decreases with an increase in pH and the effects of pH change are more obvious than those of T or P s. The total resistance (1/k T) of MAP dissolution increases with pH increase, P s growth, or T reduction. The comparison of 1/k s and 1/k d reveals surface reaction as the MAP dissolution control step and indicates a linear relation among 1/k s , 1/k d , and the natural logarithm of P s at pH 7.0. [Display omitted] • The solubility of struvite is more affected by pH than temperature and particle size. • The resistances during the dissolution process of struvite were calculated. • Surface reaction is the controlling step in the dissolution of struvite. • The resistance was found to have a linear relationship with particle size at pH 7.
- Subjects
SURFACE reactions; SURFACE resistance; URINARY calculi; PH effect; TEMPERATURE; SILICON isotopes
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2023, Vol 200, p42
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2023.10.048