Zero Liquid Discharge Systems

We offer our clients Zero Liquid Discharge Systems that is an advanced wastewater treatment service. Zero Liquid Discharge Water Treatment (ZLD) is a term used to describe the complete elimination of liquid discharge from a manufacturing process. A well-designed (ZLD) Zero Liquid Discharge Water Treatment system is used to minimize the volume of liquid waste that requires treatment, while also producing a clean stream suitable for use elsewhere in the plant processes.

A common ZLD approach is to concentrate the waste water and then dispose of it as a liquid brine, or further crystallize the brine to a solid. A typical evaporator uses tube-style heat exchangers. The evaporated water is recovered and recycled while the brine is continually concentrated to a higher solids concentration. Concentrated brine is disposed of in a variety of ways, such as sending it to a publicly owned treatment works, using evaporation ponds in areas with net positive evaporative climates, or by treatment in a crystallizing system, such as a circulating-magma crystallizer or a spray dryer. Crystallized solids can be landfilled or applied to land, depending upon the crystal characteristics.

As environmental, political and public health entities place more focus on waste water management, ZLD strategies are more often being evaluated for feasibility in industrial facilities. The ZLD approach taken, however, greatly depends on the quality of water available for use.

ZLD System improve operations and it has great benefits like:

  • Reduction or elimination of costly regulatory compliance
  • Reliable chemical/physical processes
  • Small footprint
  • Ease of operation
  • Almost 100% water recovery
  • Almost 100% metals and chemical recovery
  • Modular construction
  • Low costs