Departament of Mechanical Engineering, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170525, Ecuador.
Departament of Civil and Environmental Engineering, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170525, Ecuador.
Sci Total Environ. 2021 Dec 20;801:149666. doi: 10.1016/j.scitotenv.2021.149666. Epub 2021 Aug 14.
The caffeine adsorptive performance and compatibility characteristics (Eisenia foetida Savigny) of rice husk, peanut shell, corn cob and coconut fiber were studied, aiming to assess the suitability of these residues for vermifilter beds. For this purpose, the agro-industrial residues were characterized and the E. foetida Savigny compatibility was determined by acute and chronic toxicity tests. Batch adsorption tests were performed using caffeine solutions. Optimal adsorption conditions, kinetic models, isotherm type and the influence of three particle sizes (120-150, 300-600, 800-2000 μm) in the caffeine removal were determined. Coconut fiber (120-150 μm) proved to be the most efficient residue for the caffeine removal (94.2%), requiring 4 g/L for 30 min. However, coconut fiber was the less compatible for earthworms (14d-LC = 82%). The results obtained allow to define adequate strategies, such as mixing highly adsorptive residues with the more compatible ones, to choose the most effective materials for vermifiltration technologies.
研究了稻壳、花生壳、玉米芯和椰子纤维对咖啡因的吸附性能和兼容性特征（赤子爱胜蚓），旨在评估这些残留物是否适合用作蚯蚓过滤器床。为此，对农业工业残留物进行了表征，并通过急性和慢性毒性试验确定了赤子爱胜蚓的兼容性。使用咖啡因溶液进行批量吸附试验。确定了最佳吸附条件、动力学模型、等温线类型以及三种粒径（120-150、300-600 和 800-2000 μm）对咖啡因去除的影响。对于咖啡因的去除，椰子纤维（120-150 μm）是最有效的残留物（去除率为 94.2%），需要 4 g/L 并作用 30 分钟。然而，椰子纤维对蚯蚓的兼容性最差（14d-LC = 82%）。研究结果可以定义合适的策略，例如将高吸附性的残留物与更兼容的残留物混合使用，以选择最有效的材料用于蚯蚓过滤技术。
