A growing number of industrial operators face the challenge of developing more sustainable solutions for their production sites. For water needs, SUEZ’s Zero Liquid Discharge (ZLD) process is a complete and cost-effective solution recovering high quality water for re-use while enhancing the production of solid by-products and reducing the facility’s environmental footprint.
The ZLD System removes unwanted solids from streams and returns high-quality water to the plant process (source). Membrane filtration (such as reverse osmosis) may be used to concentrate the stream and to return the clean permeate to the process. In this case, a much smaller volume (the reject) will require evaporation, thus enhancing performance and reducing power consumption. In many cases, falling film evaporation is used to further concentrate the brine prior to crystallization.