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Zero Liquid Discharge (ZLD) is a treatment process that its goal is to remove all the liquid waste from a system. The focus of ZLD is to reduce economically wastewater and produce clean water that is suitable for reuse, thus saving money and being beneficial to the environment. ZLD systems employ the most advanced wastewater treatment technologies to purify and recycle virtually all of the wastewater produced.
ZLD technology includes pre-treatment and evaporation of industrial effluent until the dissolved solids precipitate as crystals. These crystal are removed and de-watered with filter press or centrifuge. The water vapor from evaporation is condensed and returned to the process.