关键词: 用水网络, 间歇过程, 废水, 再生, 优化

Abstract: Currently,the problem of water scarcity and water pollution is increasingly severe. It is an effective way of fresh water conservation and environmental protection by reusing regenerated wastewater. In order to achieve reasonable utilization of process sources with different qualities for maximum reuse of water in batch processes,a superstructure of water-using network was proposed involving source-sink,source-intermediate storage tank-sink,source-continuous regeneration system-sink and source-wastewater disposal system. The mathematical formulation is based on a continuous time representation. With multi-objective optimization design method,design problems for minimizing the freshwater consumption,the regeneration rate of the regeneration unit and the number of intermediate storage tanks can be achieved in turn. Finally,an applicable network configuration with the minimum amount of freshwater consumption and wastewater discharge was obtained. Additionally,in consideration of the actual production process of multiple batch cycles,this paper focused on the design,analysis and optimization problem of water-using network from start-up to the steady state. A case study was solved to demonstrate the effectiveness of the proposed approach.

Key words: water-using network, batch processes, waste water, regeneration, optimization