We offer our clients Zero Liquid Discharge Systems designed on advanced user friendly technologies. Zero Liquid Discharge (ZLD) is a term used to describe the complete elimination of liquid discharge from a manufacturing process. A well-designed Zero Liquid Discharge (ZLD) 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 wastewater through well designed multiple measure systems and then dispose of it as a liquid brine, or further crystallize the brine to a solid. A typical evaporator (MEE) 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 (ATFD) or a spray dryer. Crystallized solids can be landfilled or applied to land, depending upon the crystal characteristics. However in most of the cases it is categorised as hazardous waste.
As environmental, political and public health entities place more focus on wastewater 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
a) Cost effective solution towards low salinity rejects having a feed salinity between 5 to 10%. b) Best steam economy. c) Low power costs due to first stages of falling film evaporation. d) Flexibility in selection of material of construction. e) Combination of pre-heaters and thermo vapor compressor ensures further steam economy.
2. FORCED FILM EVAPORATORS (MULTI EFFECT EVAPORATOR - MEE)
a) Cost effective solution towards high salinity rejects. b) Reverse feed arrangement ensures maximum utility of motive steam. c) Horizontal configuration reduces space and height requirement and provides ease of monitoring and maintenance. d) All monitor- able parameters can be visualized at one level apart from virtual visualization on the HMI/ SCADA screen.
3. ATFD (AGITATED THIN FILM DRYER) CRYSTALLISERS (MEE)
a) Crystallizes the final slurry to salt containing less than 10% moisture. b) Adjustable blade arrangement ensures flexibility to varying input quality of crystallizable salts. c) Minimal maintenance and extremely compact design saves on space requirements. d) Placed on the same platform as that of evaporator flash vessels and hence can be easily monitored at one level apart from virtual visualization on the HMI/ SCADA screen.