Zero Liquid Discharge ZLD
The Benefits of Zero Liquid Discharge
ZLD improves the environmental and economic footprint of a plant
In order to increase the environmental friendliness of industrial plants, ZLD is used in a wide variety of fields. Zero Liquid Discharge improves the environmental and economic footprint of a plant. Firstly by reusing water, and secondly by avoiding the discharge of wastewater, which could incur high costs or damage the environment. In this way, ZLD helps companies comply with strict regulations and guidelines regarding wastewater disposal and water reuse, as well as protecting the local environment. In addition, ZLD enables the recovery of valuable resources from wastewater, which can be reused in the industrial process or sold.
Zero Liquid Discharge helps to:
- Protect the environment and water resources
- Fulfill government regulations
- Achieve higher levels of water recovery
- Reduce wastewater volumes
- Reduce costs
- Recover salts from wastewater (e.g. potassium sulfate, sodium sulfate, sodium chloride, lithium salts, mixed salts)
Industries that use ZLD include e.g.:
- Oil, gas & refineries
- Power generation
- Steel & mining
- Cellulose & paper
- Tanning & textile dyeing
- Beverages & food
- Drinking water treatment
What is ZLD?
Zero Liquid Discharge (ZLD) is a treatment process focused on the economical reduction of wastewater. This produces clean water suitable for reuse, saving money and protecting the environment.
ZLD systems utilize advanced wastewater/desalination technologies to treat and recycle virtually all the wastewater generated. In this process, the components dissolved in the water are converted into reusable solids such as sludge and salt.
Different technologies are typically combined, such as thermal evaporation, crystallization, desalination and drying, and centrifugal separation.
The ZLD process
The first step is to filter or precipitate waste and chemicals that are easy to remove. The wastewater is then concentrated by means of evaporation. In the third step, the concentrated waste stream is fed into a crystallizer. In the last and decisive step, this suspension of water and crystallized solid is separated using a centrifuge. The efficiency of the upstream steps matters little; it is the use of the right centrifuge that determines the overall efficiency of the plant.
If you are interested in what one of our experts has to say about ZLD, read this article.
Get even more information about Zero Liquid Discharge and why the CONTURBEX offfers a number of advantages in ZLD processes.
Conturbex centrifuges ideal for zero liquid discharge process
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