Agitated Thin Film Evaporators/Dryers involved in Zero Liquid Discharged (ZLD) System – A Comparative Study

 Agitated Thin Film Evaporators/Dryers involved in Zero Liquid Discharged (ZLD) System – A Comparative Study

https://drive.google.com/file/d/1oHz2BkRBU2mRn4GV-8doQ94aEGX9Sg8C/view?usp=sharing

Waterman Engineers Australia

Zero Liquid Discharge System

Water is by far the most important commodity in today’s industrialized world. However, its increased use and contamination in industrial processes have put great threats to both its scarcity and environmental pollution. With such an alarming consequence, coming up with an idea like the “Zero Liquid Discharge System” or ZLD System that can effectively address the issues of water quality, security, ecosystems, and economic growth as well.

In the Zero Liquid Discharge (ZLD) technique, we generally focus on minimizing the waste and recycling the water without discharging it to the receiving bodies. In the conventional ZLD systems, we focus on the thermal processes, i.e., feeding the wastewater (brine) into evaporators and then to brine crystallizers of zld water treatment plants. The distillate then gets recycled in an effluent recycling system. While the rest of the solids are either disposed of or recovered as valuable by-products in the downstream processes of zero discharge system.

Advantages of the Zero Liquid Discharge System (ZLD)

We can use the ZLD system or Zero Liquid Discharge Systems. to recover valuable substances and sell them in the market to make it an economical process as well.

We can obtain a 50-99 % concentrated caustic soda through the ZLD system.

Sodium sulphate can also be recovered from a battery manufacturing resource.

Recovery of the pure sodium chloride which is saleable.

We can also recover gypsum from the mine water and flue gas desalinization wastewater.

Some other advantages include:

Waste management becomes easy due to the lower amount of wastewater.

The threat of water scarcity reduces due to a good effluent recycling system.

We can also minimize the capital spent on the transportation of the waste.

The thermal processes used in the Zero Liquid Discharge Systems generally use the following two unit operations.

For more info please visit https://watermanaustralia.com/agitated-thin-film-evaporators-dryers-involved-in-zero-liquid-discharged-zld-system/