Does industrial waste water really have to be mixed with dangerous chemicals in order to clean them?

Is it possible to establish industrial processes free of any waste water?
Is recycling of effluent water possible to gain high-quality process water?

Seeking for the answers to these three questions lead to the establishment of the individual enterprise KBO Steffen Hartmann in 1992, which was complemented by the company STEFFEN HARTMANN RECYCLINGTECHNOLOGIEN GMBH in 2007.