Abstract

A method for solving the planning problem of optimal water allocation is presented. All the alternative systems are combined into an integrated system by employing structure variables or split ratios at the point where a water stream is split into more than two streams. The values of structure variables are determined for given process conditions so as to minimize the total cost, subject to constraints derived from material balances and interrelationships among water-using units and wastewater-treating units. The optimization problem is solved by using the Complex method. The method is illustrated by its application to the water allocation problem in a petroleum refinery.

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