A heat exchanger including a hot process stream fluidly connected to an industrial process, a cold process stream fluidly connected to an industrial process, and a membrane distillation system. The membrane distillation system includes a vaporizing stream comprising a mixture of components, a condensing stream, and a membrane located between the vaporizing stream and the condensing stream. The vaporizing stream and condensing stream are in fluid communication through the membrane. The membrane distillation system also includes a first heat transfer area between the hot process stream and the vaporizing stream. Additionally, the membrane distillation system includes a second heat transfer area between the condensing stream and the cold process stream.