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Evaluation of the benefit of practically operating reverse osmosis system in the factory: taking the recycling of KI solution and water of the screen polarizing plate as an example
Journal of Water Reuse and Desalination ( IF 2.3 ) Pub Date : 2021-09-01 , DOI: 10.2166/wrd.2021.110
Shih-feng Tseng, Chien-Ming Lo, Chun-hsiung Hung

In recent years, with the advocacy of the circular economy and the rising awareness of environmental protection, energy saving, water saving and carbon reduction have become important topics for discussion today. The high-tech semiconductor, photoelectric, solar and other electronic industries involve high energy and water consumption. In addition to responding to the energy saving, water saving and carbon reduction, one of the main purposes of this system development is to reduce the use of materials and make the process chemicals reusable. In the practical factory operation, a large amount of water is used in the polarization process, and the wastewater generated in etching and pickling is discharged continuously. In order to recycle the water discharging from the manufacturing process, the reverse osmosis membrane system (RO membrane system) is often used for wastewater recycling. In this study, the KI waste liquid discharging from the process of a polarizing plate factory was concentrated with anti-fouling RO membrane. The quantity and arrangement of RO system membranes were simulated and designed with software, and the results, such as water volumes and pressures of inflow and outflow water for the membrane, changes of membrane pressure difference (ΔP), changes of permeating water quality, chemical cleaning frequency and water collection time, were discussed and the optimal parameters of RO membrane, such as the best water collection volume and time, chemical cleaning frequency, best concentration, time and temperature matching with cleaning in process (CIP) were inferred so as to improve the stability of the RO membrane system, enable RO permeating water to enter the water purifying system for reuse, reduce the treatment cost of wastewater recycle and improve the permeating water output efficiency of treatment equipment, accommodating effective utilization of water resources and economic benefits and to sustainable development of the industry.



中文翻译:

工厂实际运行反渗透系统的效益评价:以屏幕偏光板的KI溶液和水的回收利用为例

近年来,随着循环经济的倡导和环保意识的不断提高,节能、节水、减碳成为当今讨论的重要话题。高科技半导体、光电、太阳能等电子行业涉及高能耗和高水耗。除了应对节能、节水、减碳之外,该系统开发的主要目的之一是减少材料的使用,使工艺化学品可重复使用。在实际的工厂操作中,极化过程中使用了大量的水,蚀刻和酸洗产生的废水不断排放。为了回收制造过程中排放的水,反渗透膜系统(RO膜系统)常用于废水回收。本研究将偏光片厂生产过程中排出的KI废液用防污RO膜浓缩。通过软件对反渗透系统膜的数量和布置进行了模拟设计,得到了膜的水量、进出水压力、膜压差(ΔP ),渗透水质、化学清洗频率和集水时间的变化,讨论了反渗透膜的最佳参数,如最佳集水量和时间、化学清洗频率、最佳浓度、与清洗匹配的时间和温度从而提高RO膜系统的稳定性,使RO渗透水进入净水系统回用,降低废水回用的处理成本,提高处理设备的渗透水输出效率,有利于水资源的有效利用和经济效益,有利于行业的可持续发展。

更新日期:2021-09-03
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