This work explores the technical viability in the use ofMoringa oleifera Lam. seeds produced in Ecuador as an adsorbent medium for copper (Cu), nickel (Ni) and chromium (Cr) present in water that could be implemented in future Water Resource Recovery Facilities in Ecuador. The seeds were prepared following a sequence of washing, drying, crushing, sieving, rewashing, and final drying. Two treatments were performed based on particle size. Treatment 1 consisted on a mixture of 70% of particles larger than 2 mm and 30% of particles between 1 and 2 mm; while Treatment 2 consisted only on 1 - 2 mm particles. Batch experiments were performed with metal concentrations ranging from 10 to 150 ppm, a dose of 1.00 g of MO per liter, and mechanical stirring for 1 hour. Treatment 2 showed to be more favorable to metal removal and the Langmuir model better characterized adsorption of the three metals.The best kinetic description of the three metals is that of a pseudo first-order reaction where the adsorption capacities are 50.93 mg Cu/g MO, 30.14 mg Ni/g MO, and 40.98 mg Cr/g MO, with removal percentage of 37 - 53 %, 39 - 76%, and 11 - 33%, respectively.
Este trabajo presenta un modelo de salto de partículas en tres dimensiones generado mediante dinámica de fluidos computacional (CFD) cuya aplicación puede extenderse en cualquier lugar geográfico y actividad que involucre una exposición directa de partículas hacia la atmósfera por acción del viento. El fenómeno de salto de partículas involucra la interacción de diversos procesos como: el movimiento de la partícula en el salto, las modificaciones del perfil de viento a través de la transferencia de momento entre el flujo de viento y las partículas en salto, y la colisión de partículas con el suelo que ocasionará la posterior salpicadura de partículas de la superficie en la corriente del fluido. Este modelo de dispersión describe el comportamiento del viento generado por distintas velocidades en dirección horizontal y el perfil formado por diferentes rugosidades del terreno. Además, incluye la trayectoria de movimiento de partículas debido a las fuerza de cizalladura del aire, gravedad, arrastre y efectos turbulencia debido al retardo del viento.
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