Status : Verified
| Personal Name | Valderama, Victor Jr. E. |
|---|---|
| Resource Title | A Crystallization Platform for Sustainable Resource Recovery: Tunable Phase-Selective Recovery of Copper and Nickel from Electroplating Wastewater |
| Date Issued | 1 January 2026 |
| Abstract | Electroplating wastewater is a significant source of copper and nickel contamination, often generating large volumes of unstable sludge when treated using conventional precipitation methods. This study developed a tunable crystallization platform based on the Fluidized-Bed Homogeneous Crystallization Process (FBHCP) to achieve phase-selective recovery of these metals from synthetic electroplating wastewater. Two systems were designed using carbonate and phosphate precipitants to evaluate the interactive effects of pH, molar ratio, and influent flow rate on removal and granulation efficiencies through factorial and Central Composite Design (CCD) optimization. The carbonate system achieved optimal recovery at pH 9.0, molar ratio 1.5, and flow rate 20 mL min⁻¹, yielding 98.84 % copper and 90.13 % nickel removal with crystalline phases dominated by glaukosphaerite and malachite. The phosphate system, operated at pH 9.5, molar ratio 1.5, and flow rate 10 mL min⁻¹, attained > 99.9 % simultaneous recovery of both metals, producing dense, hollow granules primarily composed of Ludjibaite (Cu₅(PO₄)₂(OH)₄). Kinetic and thermodynamic analyses revealed precipitant-dependent crystallization pathways governed by supersaturation control and hydrodynamic stability. Both systems minimized sludge formation and energy use. Overall, FBHCP demonstrates a sustainable, phase-selective crystallization platform that transforms metal-laden wastewater into reusable resources—advancing circular economy and zero-waste goals. |
| Degree Course | PhD Environmental Engineering |
| Language | English |
| Keyword | Fluidized-bed homogeneous crystallization; Electroplating wastewater; Resource recovery; Carbonate; Phosphate; Copper; Nickel |
| Material Type | Thesis/Dissertation |
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Category : I - Has patentable or registrable invention of creation.
Access Permission : Limited Access