Wastewater purification has been considered to be a major cost not only for industries but also for society as a whole. Current technologies in the market are both costly and time consuming. This study proposed a supercritical CO₂ (SCCO₂)-driven countercurrent system for separating the emulsified oil from water (Case 1) and reducing the chemical oxygen demand (COD) from electroplating wastewater (Case 2). The effects of the operating parameters, including temperature, pressure and residence time/CO₂ flow rate/CO₂-to-feed ratio, were discussed. In addition, a design for recycling CO₂ was developed for the purpose of saving CO₂ costs. Taking commercialization into consideration, the process was scaled-up to 250 tonnes/day, and the recommended processing fee was $1.12/tonne for a payback period of 1.29 year, based on the process simulation and techno-economic analysis (TEA). Compared to the current process, this technology has advantages including that it is low cost, efficient, and most importantly, environmentally friendly.

废水净化被认为不仅是工业的费用，而且是整个社会的主要费用。市场上的当前技术既昂贵又费时。这项研究提出了一种超临界CO ₂（SCCO ₂）驱动的逆流系统，用于从水中分离乳化油（案例1）并减少电镀废水中的化学需氧量（COD）（案例2）。讨论了操作参数的影响，包括温度，压力和停留时间/ CO ₂流量/ CO _2-进料比。另外，为了节省CO ₂，开发了用于CO ₂再循环的设计。费用。考虑到商业化，该工艺的规模扩大到每天250吨，基于工艺模拟和技术经济分析（TEA），建议的加工费为1.12美元/吨，投资回收期为1.29年。与当前工艺相比，该技术具有以下优势：低成本，高效，最重要的是环境友好。