Ibarra-Taquez Harold N, GilPavas Edison, Blatchley Ernest R, Gómez-García Miguel-Ángel, Dobrosz-Gómez Izabela
Grupo de Investigación en Procesos Reactivos Intensificados con Separación y Materiales Avanzados - PRISMA, Colombia; Departamento de Ingeniería Química, Facultad de Ingeniería y Arquitectura, Universidad Nacional de Colombia, Sede Manizales, Campus La Nubia, km 9 vía al Aeropuerto la Nubia, Apartado Aéreo 127, Manizales, Colombia.
GIPAB: Grupo de Investigación en Procesos Ambientales, Departamento de Ingeniería de Procesos, Universidad EAFIT, Cr 49 # 7 Sur 50, Medellín, Colombia.
J Environ Manage. 2017 Sep 15;200:530-538. doi: 10.1016/j.jenvman.2017.05.095. Epub 2017 Jun 16.
Soluble coffee production generates wastewater containing complex mixtures of organic macromolecules. In this work, a sequential Electrocoagulation-Electrooxidation (EC-EO) process, using aluminum and graphite electrodes, was proposed as an alternative way for the treatment of soluble coffee effluent. Process operational parameters were optimized, achieving total decolorization, as well as 74% and 63.5% of COD and TOC removal, respectively. The integrated EC-EO process yielded a highly oxidized (AOS = 1.629) and biocompatible (BOD/COD ≈ 0.6) effluent. The Molecular Weight Distribution (MWD) analysis showed that during the EC-EO process, EC effectively decomposed contaminants with molecular weight in the range of 10-30 kDa. In contrast, EO was quite efficient in mineralization of contaminants with molecular weight higher than 30 kDa. A kinetic analysis allowed determination of the time required to meet Colombian permissible discharge limits. Finally, a comprehensive operational cost analysis was performed. The integrated EC-EO process was demonstrated as an efficient alternative for the treatment of industrial effluents resulting from soluble coffee production.
速溶咖啡生产会产生含有有机大分子复杂混合物的废水。在这项工作中，提出了一种使用铝电极和石墨电极的顺序电凝聚 - 电氧化（EC - EO）工艺，作为处理速溶咖啡废水的替代方法。对工艺操作参数进行了优化，实现了完全脱色，以及分别去除74%的化学需氧量（COD）和63.5%的总有机碳（TOC）。集成的EC - EO工艺产生了高度氧化（氧化态 = 1.629）且生物相容性良好（生化需氧量/化学需氧量≈0.6）的废水。分子量分布（MWD）分析表明，在EC - EO工艺过程中，电凝聚有效地分解了分子量在10 - 30 kDa范围内的污染物。相比之下，电氧化对于分子量高于30 kDa的污染物矿化效率很高。动力学分析确定了达到哥伦比亚允许排放限值所需的时间。最后，进行了全面的运营成本分析。集成的EC - EO工艺被证明是处理速溶咖啡生产产生的工业废水的有效替代方法。
