耦合多个废水处理过程的再生再利用水网络优化设计

Optimal design of regeneration reutilization water network coupled with multiple wastewater treatment processes

为了探讨处理后废水的分级利用,本文提出耦合多个水处理过程再生再利用水网络,包括多股新鲜水源,过程水源/水阱以及多个水处理过程串联构成的水处理系统。首先对水网络进行详细的物料衡算分析,结合自动确定目标值的方法,分别以最小化高品质新鲜水源的流率,新鲜水源的总流率和运行成本为目标函数,构建3个优化的非线性规划模型,利用商业优化软件LINGO V13.0建模及内置的Global Solver进行求解,并对优化结果进行分析比较。结果表明,模型Ⅲ优化的总运行成本达到最低值440.83 RMB/h,新鲜水量适中,整体水处理系统的负荷较低,而且最终污染物排放浓度低于设定的上限值,有利于满足未来日益严格的环保法规要求。

In order to investigate the cascade utilization of treated wastewater, this paper introduced regeneration reutilization water network coupled with multiple wastewater treatment processes, includes multiple freshwater sources, process water sources/sinks and wastewater treatment system with multiple wastewater treatment units in series. The material balance of water network is firstly performed in detail. Combined with automated targeting approach, three non-linear programming models with minimizing the flowrate of freshwater with highest quality, total flowrate of freshwater and operation cost as object functions are presented. The models are coded in the commercial optimization software LINGO V13.0 and the incorporated Global Solver is utilized to solve the models. The comparison for the optimized results shows that, the operation cost for model III reaches the minimum value （440.83 RMB/h）, the flowrate of freshwater is moderate, the total capacity of wastewater treatment system is at a comparatively low level. In addition, the final emission concentration of contaminant is lower than the regulated value and it is favorable to fulfil the increasing stricter requirements of environmental regulations.