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采用分段设计法研究水处理过程。根据给水浓度和产水浓度要求的不同,以年费用最小为目标,将水处理过程作为超结构模型,进而优化设计段数和每段的工艺参数。研究表明,当进水浓度为5 000 ppm～35 000 ppm时,制备生活用水采用反渗透法处理费用最低,而制备纯水采用反渗透+离子交换联合法处理费用最低;当进水浓度为500 ppm～5 000 ppm时,前者采用电渗析法处理费用最低,而后者采用电渗析+离子交换联合法处理费用最低;当进水浓度小于500 ppm时,制备纯水采用离子交换法费用最低。
Using subsection design method to study the water treatment process. According to the requirements of water supply concentration and water production concentration, taking the annual cost as the minimum, the water treatment process is taken as the superstructure model to optimize the design of the number of sections and the process parameters of each section. The results show that when the influent concentration is 5 000 ppm-35 000 ppm, the cost of preparation of domestic water is the lowest by reverse osmosis, while the cost of preparation of pure water by reverse osmosis + ion exchange is the lowest. When the influent concentration is 500 For the former, the cost of electrodialysis treatment is the lowest, while the latter is the lowest by electrodialysis + ion exchange method. When the influent concentration is less than 500 ppm, the cost of preparing pure water by ion exchange method is the lowest.