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Evaluation of the Biostability of Elodea (Egeria densa) and Orange Peel as Bioadsorbent Materials for Pb (II) and Cr (III) in Solution
Evaluación de la bio-estabilidad de la Elodea (Egeria densa) y la cáscara de naranja como bio-adsorbentes de Pb (II) y Cr (III) en solución
DOI:
https://doi.org/10.15446/ing.investig.95432Keywords:
bioadsorption, chromium, lead, biodegradation, biostability (en)bioadsorción, cromo, plomo, biodegradación, bioestabilidad (es)
A variety of plant-based materials can be used in innovative methods to treat water pollution through bio-adsorption. This work evaluated, under lab conditions, the presence of native microorganisms in orange peel (OP) and elodea (Egeria densa, ELO), the aerobic degradation and biostability of the bio-adsorbents, and the contribution of microorganisms to the bio-adsorption of Pb (II) and Cr (III). The microbial characterization and biostability of OP and ELO were conducted using 2 g of dried bio-adsorbent and a solution of the metallic ions at 450 mg/L. ELO had a larger number of bacteria, fungi, and yeast than OP. After 2 hours of contact with a 450 mg/L Pb (II) and Cr (III) solution, this value decreased by 80-86% in both bio-adsorbents. After 25 days, the microorganisms showed adaptation to the Pb (II) and Cr (III) concentrations. According to the bio-degradation test, OP had a stability of over 7,01 months, while that of ELO was 2,61 months, with a CO2 value of 1 439,9 mg after 46 days of incubation. The microorganisms tolerated a high metal concentration, but they did not contribute significantly to Cr (III) bio-adsorption in ELO. The microorganisms present in the adsorbents affect the stability of the materials, as the bio-adsorbents provide a nutrient-rich substrate. OP had higher bio-stability and could be used in pilot tests for the treatment of metal-polluted water.
Diversos materiales de origen vegetal pueden utilizarse en métodos innovadores para tratar la contaminación del agua mediante la bioadsorción. Este trabajo evaluó, en condiciones de laboratorio, la presencia de microorganismos nativos en la cáscara de naranja (CN) y elodea (Egeria densa, ELO), la degradación aeróbica, la bioestabilidad de los bioadsorbentes y la contribución de los microorganismos en la bioadsorción de Pb (II) y Cr (III). La caracterización microbiana y la estabilidad de CN y ELO se determinaron con 2 g de bioadsorbente seco y una solución de los iones metálicos a una concentración de 450 mg/L. ELO presentó un mayor número de bacterias, hongos y levaduras que CN. Después de 2 horas de contacto con una solución de 450 mg/L de Pb (II) y Cr (III), este valor disminuyó en 80-86% en ambos bioadsorbentes. A los 25 días, los microorganismos mostraron adaptación a las concentraciones de Pb (II) y Cr (III). Según el ensayo de biodegradación, CN presentó una estabilidad de más de 7,01 meses, mientras que la de ELO fue de 2,61 meses, con un valor de CO2 de 1 439,9 mg a los 46 días de incubación. Los microorganismos toleraron una alta concentración de los metales, pero no contribuyeron significativamente a la bioadsorción del Cr (III) en ELO. Los microorganismos presentes en los adsorbentes afectan a la estabilidad de los materiales, ya que los bioadsorbentes proporcionan un sustrato rico en nutrientes. CN presentó una mayor bioestabilidad y puede ser utilizada en pruebas piloto para el tratamiento de aguas contaminadas con metales.
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