Zero Liquid discharge is a process beneficial to industrial and municipal organizations as well as the environment because it saves money and no effluent, or discharge, is left over. ZLD systems employ the most advanced wastewater treatment technologies to purify and recycle virtually all of the wastewater produced. Also, Zero Liquid Discharge technologies help plants meet discharge and water reuse requirements, enabling a business to:-
- Meet stringent cooling tower blowdwn and flue gas desulfurizat on (FGD) dicharge rgulations
- Treat and recover valuable products from wastewater streams
- Better manage produced water
A ZLD is an industrial plant without discharge of wastewaters. Target ZLD is a plant without any discharge of wastewater.
Target ZLD is normally reached by:-
- Wastewater strong recovery clarification needed
- Separation by evaporation or boiling of water part of wastewater not reusable, in evaporators,
crystallized, and condensate recovery. ZLD plants Produce Solid Waste.
Reverse Osmosis
SystemRO is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water. In reverse osmosis, an applied pressure is used to overcome osmotic pressure, a colligative property, that is driven by chemical potential differences of the solvent, a thermodynamic parameter. Ro can remove many types of dissolved and suspended species from water, including bacteria, and is used in both industrial processes ad the production of potable water. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side. To be “selective”, this membrane should not allow large molecules or ions through the pores(holes) but should allow a smaller component of the solution (such as solvent molecules) to pass freelynull