Evaluation of the environmental and economic scope of an electrocoagulation process for the treatment of wastewater from the instant coffee industry

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Izabela Dobrosz-Gómez, Harold N. Ibarra-Taquez, Miguel-Ángel Gómez-García
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Abstract

In this study, an industrial wastewater from instant coffee production was treated by electrocoagulation (EC). The effect of various EC operating parameters, such as electrode type, current density, support electrolyte concentration and stirring velocity, were investigated to determine the optimal operating EC conditions. The scope of electrocoagulation (EC) was assessed, in environmental and economic terms, for the treatment of industrial wastewater originated from the production of instant coffee. The evaluation included the effect of EC operating factors (electrode type, current density, supporting electrolyte concentration and stirring velocity) on Color removal, COD and TOC degradation, toxicity, molecular weight distribution, as well as the total operating cost. The following optimal operating conditions were established through a series of preliminary experiments, a Box-Behnken design of experiments, Response Surface Methodology application, and multi-objective optimization analysis: the pair of Fe (anode)-stainless steel (cathode) electrodes, supporting electrolyte = 1.78 g of NaCl/L; current density = 150 A/m2; electrode gap = 3 mm; stirring velocity = 350 RPM; and pH0 = 4.7 (that of raw industrial effluent). Finally, the kinetic study allowed defining the electrolysis operation time of ca. 180 min required to comply with the maximum permissible discharge limits for the production of instant coffee the discharge of soluble coffee effluents, in terms of COD concentration, established by current Colombian legislation. The EC reached ca. 97% decolorization, as well as 72% and 65% of COD and TOC removal degradation, respectively, with total operating costs of 6.26 USD/m3. This yielded an oxidized (COS = 2.87), biocompatible (BOD5/COD = 0.437) and non-toxic effluent, free of contaminants with molecular weight > 30 kDa. The EC appeared as an effective alternative for the treatment of industrial wastewater from the production of instant coffee within the framework of different Sustainable Development Goals (number 6 (Clean water and sanitation), number 7 (Clean and affordable energy), number 9 (Industry, innovation and infrastructure) and 13 (Climate action)).

Abstract Image

评估用于处理速溶咖啡行业废水的电凝工艺的环境和经济范围
本研究采用电凝法(EC)处理速溶咖啡生产过程中产生的工业废水。研究了各种电凝操作参数(如电极类型、电流密度、支撑电解质浓度和搅拌速度)的影响,以确定最佳的电凝操作条件。从环境和经济角度评估了电凝(EC)处理速溶咖啡生产过程中产生的工业废水的范围。评估内容包括电凝操作因素(电极类型、电流密度、辅助电解质浓度和搅拌速度)对色度去除率、化学需氧量和总有机碳降解率、毒性、分子量分布以及总操作成本的影响。通过一系列初步实验、箱-贝肯实验设计、响应面方法应用和多目标优化分析,确定了以下最佳运行条件:一对铁(阳极)-不锈钢(阴极)电极,支持电解质 = 1.78 克 NaCl/升;电流密度 = 150 A/m2 ;电极间隙 = 3 毫米;搅拌速度 = 350 转/分钟;pH0 = 4.7(原始工业废水)。最后,动力学研究确定了约 180 分钟的电解操作时间,以符合哥伦比亚现行法律规定的速溶咖啡生产过程中可溶性咖啡废水的最大允许排放限值(COD 浓度)。EC 的脱色率约为 97%,COD 和 TOC 的去除降解率分别为 72% 和 65%,总运行成本为 6.26 美元/立方米。这产生了氧化(COS = 2.87)、生物相容性(BOD5/COD = 0.437)和无毒的污水,不含分子量为 30 kDa 的污染物。在不同的可持续发展目标(第 6 个目标(清洁水和卫生)、第 7 个目标(清洁和负担得起的能源)、第 9 个目标(工业、创新和基础设施)和第 13 个目标(气候行动))框架内,EC 似乎是处理速溶咖啡生产过程中产生的工业废水的有效替代品。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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