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Jun 7, 2024 / in Uncategorized
Zero Liquid Discharge

Zero Liquid Discharge (ZLD) is a wastewater treatment process where no liquid waste is discharged at the end of the treatment cycle. In a ZLD system, all wastewater is purified and recycled, leaving behind only solid waste or salts that can be disposed of or reused.

The ZLD process typically involves multiple stages of treatment such as pretreatment**, reverse osmosis, evaporation, crystallization, and drying. Through these stages, contaminants are removed from the wastewater, and the purified water is recovered for reuse within the facility, while the remaining solid waste is either disposed of or recycled.

ZLD systems are often used in industries where water conservation is crucial, such as power plants, chemical manufacturing facilities, and textile industries. By implementing ZLD technology, these industries can minimize water usage, reduce wastewater disposal costs, and comply with environmental regulations regarding water discharge.

 **Pretreatment:
• Screening is a process carried out using a bar screen (automatic bar screen, manual bar screen…) which consists in retaining the large debris (plants, textiles, plastics…).
• Screening, which consists in filtering smaller particles through a fine screen.
• Decanting, which consists in letting the water rest so that the heavy particles settle at the bottom.
• Filtration, which consists of passing the water through a porous medium to remove impurities.
• Flotation, which consists of injecting air into the water to float the impurities
• and remove them from the surface.

Filcon Filters, liquid filtration experts may be able to assist in the pretreatment process.