According to CPCB, “Zero Liquid discharge (ZLD) refers to the installation of facilities and system which will enable industrial effluent for absolute recycling of permeate and converting solute (dissolved organic and inorganic compounds/salts) into residue in the solid form by adopting a method of concentration and thermal evaporation”.

ZLD helps an industry in eliminating the discharge of wastewater into nearby water bodies or on land, by enabling efficient recycling of wastewater streams. The institute has formulated an “Action Plan cum Roadmap towards ZLD” for some of it’s studies for industrial sectors such as Textile and Ferrous & Non-Ferrous.