Zero Liquid Discharge (ZLD)
Product Info
Zero Liquid Discharge is a process that is beneficial to industrial and municipal organizations as well as the environment because no effluent, or discharge, is left over.- Increasingly, legislation and industry demand a zero liquid discharge with a solid product that can either be sold more readily dumped in a sealed landfill.
- ZLD systems employ the most advanced wastewater treatment technologies to purify and recycle virtually all of the wastewater produced.
A zero liquid discharge facility (ZLD) is an industrial plant without discharge of waste waters. Target ZLD is normally reached by:
- Waste water strong recovery
- Separation by evaporation or boiling of water part of waste water not reusable, in evaporators, crystallizers and condensate recovery. ZLD plants produce solid waste.
- ZLD discharge system overview ZLD technology includes pre-treatment and evaporation of the industrial effluent until the dissolved solids precipitate as crystals. These crystals are removed and dewatered. The water vapor from evaporation is condensed and returned to the process.
Technologies used for treatment of various effluents
- Precipitation
- Membrane filtration
- Electrolytic separation
- Ion exchange
- Adsorption
- Air and steam stripping Evaporation and distillation Chemical oxidation Biological oxidation or reduction.
ZLD discharge system overview ZLD technology includes pre-treatment and evaporation of the industrial effluent until the dissolved solids precipitate as crystals. These crystals are removed and dewatered. The water vapor from evaporation is condensed and returned to the process.