Перегляд за Автор "Yao-Hui Huang"

Зараз показуємо 1 - 1 з 1
  • Ескіз
    ДокументВідкритий доступ
    Application of low-solubility dolomite mineral for phosphorus recovery
    (КПІ ім. Ігоря Сікорського, 2025) Thi-Hanh Ha; Yao-Hui Huang; Ming-Chun Lu
    This study aimed to determine whether seeding with low-solubility dolomite improves the efficiency, product quality, and scalability of phosphorus (P) recovery by fluidized-bed crystallization compared with an unseeded (homogeneous) mode, and to identify operating conditions that maximize recovery while yielding a reusable product. Two continuous 350-mL reactors were run in parallel under identical hydrodynamics (up-flow 30 m·h-1; surface loading 0.9 kg·m-2·h-1) and chemistry designed to favor calcium phosphate formation (pH 7.7; Ca/P = 3.5): a seeded system using dolomite as heterogeneous nuclei and an unseeded control. Seeding increased crystallization of both P and Ca from about 60% to about 80%; under optimal conditions, total removals reached ~85% for P and ~92% for Ca. X-ray diffraction and Raman spectroscopy confirmed tricalcium phosphate (Ca3(PO4)2·xH2O) as the dominant phase in both modes, while microscopy showed that the seeded bed produced larger, denser pellets with fewer fines, simplifying solid–liquid separation and supporting scale-up. Sensitivity tests across pH 6–8.7 validated the selected set-point, and “blank” runs with dolomite alone showed minimal P removal, indicating that performance gains arise from controlled supersaturation with added calcium. The recovered P, in a stable crystalline form, is suitable for slow-release fertilizers and as feedstock for bio-ceramics and bioactive glass. Note: The results presented in this abstract have been published in Separation and Purification Technology as: Ha, T.H., Mahasti, N.N., Lu, M.C., and Huang, Y.H. (2022). Sep. Purif. Technol. 303, 122192. https://doi.org/10.1016/j.seppur.2022.122192