逐步非线性规划法求解多组分废水最小化问题

对多组分用水系统的优化设计即废水最小化问题进行了研究，在逐步线性规划法的基础上，提出了逐步非线性规划法的过程优化设计方法。新方法首先按每个组分的限定浓度对各操作进行排序，然后对每个操作序列进行逐级优化匹配。然后通过比较选出一个用水量最小的设计，作为过程的最终设计。其中，对单元操作i的优化匹配就是解非线性规划问题。并通过一个实例计算结果表明，本文算法是简单而有效的。

Step by step non-linear programming method for wastewater minimization of multiple contaminants

The optimization design of the water-using systems of multiple contaminants, i. e. wastewater minimization, is addressed. Stem from the step by step linear programming method, a modified method is proposed, which we name step by step non-linear programming method. From the beginning, the processes are collated according to the limiting operating data of each contaminant, and then the matching between the rich streams and lean steams (water sources) is optimized step by step in accordance to the collated processes for each process sequence, ultimately the design of water-using network, which minimizes fresh water usage, is selected by comparison. Which of, the mathematical formulation of the optimization problem for operation i leads to a non-linear programming. One example is solved to demonstrate the effectiveness and convenience of the new method.