Application of low-solubility dolomite mineral for phosphorus recovery
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Дата
2025
Автори
Науковий керівник
Назва журналу
Номер ISSN
Назва тому
Видавець
КПІ ім. Ігоря Сікорського
Анотація
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
Опис
Ключові слова
fluidized-bed crystallization (FBC/FBHC), seeded crystallization, unseeded crystallization, dolomite (CaMgCO3)2, phosphorus recovery, calcium crystallization, pH optimization, tricalcium phosphate (Ca3(PO4)2·xH2O), slow-release fertilizer, bio-ceramics, кристалізація у псевдозрідженому шарі (FBC/FBHC), досівний метод, бездосівний метод, доломіт (CaMgCO3)2, відновлення фосфору, кристалізація кальцію, оптимізація pH, трикальційфосфат (Ca3(PO4)2·xH2O), добриво з повільним вивільненням, біокераміка
Бібліографічний опис
Thi-Hanh Ha. Application of low-solubility dolomite mineral for phosphorus recovery / Thi-Hanh Ha, Yao-Hui Huang , Ming-Chun Lu // Матеріали XХV Міжнародної науково-практичної конференції «Екологія. Людина. Суспільство» пам’яті д-ра Дмитра СТЕФАНИШИНА (12 червня 2025 р., м. Київ, Україна). – Київ : КПІ ім. Ігоря Сікорського, 2025. – С. 319-320.