This work develops a heuristic method for the design of batch water-using networks of multiple contaminants with regeneration unit based on the concepts of concentration potential. A water-using network involving regeneration unit can be formed by adding the regenerated stream(s) into the network involving reuse only. In the design procedure of the network operated in a single batch mode

time is taken as the primary factor and concentration potentials as the secondary one. For the networks operated in a repeated mode

the design procedure is similar to that for continuous processes

besides designing the storage tanks with the rules proposed. Continuous regeneration unit is selected in this work. With the proposed method

the network structure corresponding to the minimum freshwater consumption can be obtained. It is shown that the method proposed in this article is simple

effective and has clear engineering meaning.