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Zero liquid discharge (ZLD) is a wastewater treatment process, which is designed to remove liquid waste from the system. This is done to achieve zero discharge at the end of wastewater management cycle so that no liquid waste leaves the boundary of the facility. It is a progressive wastewater treatment process that is comprised of reverse osmosis, ultrafiltration, evaporation/crystallization, and fractional electro deionization. There are two types of zero liquid discharge systems namely conventional ZLD systems and hybrid ZLD systems. Conventional ZLD system includes falling film brine concentrators, vertical tube vertical tube evaporators (seed slurry concentrators) and non-seeded evaporators, forced circulation crystallizers, horizontal spray film evaporators, filter presses, centrifuges and drum dryers for sludge dewatering. Moreover, hybrid ZLD system involves integrated automated system with membrane pre-concentrators, followed by thermal/evaporation technologies.