Everything to know about Zero Liquid Discharge Water Treatment Technology


The wastewater has been a growing concerns of environmentalists and a large amount of wastewater is coming from the industries like pharmaceutical, tanneries, sewages, nuclear, petroleum and electric power plants. The increased disposal of wastewater in fresh water sources lead environmental concerns and the wastewater treatment plants came-up as a way to resolve the concern of wastewater. The wastewater treatment plants use to treat the wastewater coming out of industries or domestic sewages and then release it into some fresh water bodies or reuse it for the purpose of domestic needs and irrigation purpose.

What is zero liquid discharge system (ZLD)?

Zero Liquid Discharge (ZLD) is one of the advanced system for wastewater treatment, the ZLD use to treat the wastewater in way that the waste discharge is minimum whereas the amount of treated water coming out of the plant is maximum in compare to other ways of water treatment. The ZLD is the water treatment process which is designed to recover almost all the water from industrial processes, leaving behind only the solid waste, or a small volume of concentrated brine.

Key Components of ZLD Systems:

The ZLD is the process which use the following components for the treatment of the wastewater, and to save the maximum of the treated water while discharging the bare minimum waste after treatment.

  • Pre-treatment: The pre-treatment is to removes any large particles, oil, and other contaminants present in the wastewater. So, it’s the step to separate the contaminants from the wastewater.
  • Concentration: In this phase, the wastewater is concentrated by the process like evaporation or reverse osmosis to reduce the water volumes.
  • Crystallization: As the word crystallization refers the solidification of the water, in this step the concentrated water is further treated to produce solid crystals, which can be disposed of.
  • Dewatering: In this step the concentrated debris or waste is further dewatered to removing the remained waste water.
  • Brine management: The brine management is the last step to ZLD treatment. In this step the concentrated brine, which contains most of the dissolved solids from the wastewater, is treated further to reduce its volume and recover valuable salts.

Importance of ZLD:

Although all types of wastewater treatment is the way to remove the contaminants and minimise the pollutants present in the wastewater, so that the pollution could be reduced and while discharging the treated water. The ZLD came up as an advanced way to treat the wastewater so that the amount of discharged water could minimized.

  • Environmental Compliance: The ZLD systems helps industries and commercial plants to meet the strict environmental laws and regulations by eliminating liquid waste discharge.
  • Resource Recovery: The ZLD is the best way to save the fresh water sources as well as the underground water sources. The places having water scarcity can use the ZLD system which helps in maximum utilization of the water by living minimum discharged wastewater. We can use the treated water in domestic needs or for irrigation purpose and by doing this we are not only saving the water resources but also the electricity.
  • Water Conservation: Conservation of water is one of the essential need of humanity and ZLD is the best possible way to save maximum water.

How to choose a right zero liquid discharge system?

Choosing the right ZLD is the as important as any other essential thing of the treatment plant. Well, for choosing the right ZLD plant you can opt following two criteria.

  • Economic Viability: Do consider your economic viability before choosing any ZLD plant, make sure to analyse all possible expenses which may be incurred while setting-up the plant and whether the needed cost is sustainable and viable for you or not.
  • Technological Advancements: Do check and find whether the technologies provided to you is upgraded and advanced or not.

Challenges to zero liquid discharge system:

Despite having many benefits, we can’t deny that there are various challenges which needs to be addressed. Well, following are few of the major challenges to zero liquid discharge system.

  • Energy Consumption: The ZLD systems do require a significant amount of energy inputs for its various processes which leads to higher energy consumption.
  • High Costs: Implementing ZLD systems can be expensive due to need of various advanced technologies and energy requirements in ZLD.
  • Scaling Issues: Scaling-up or scaling-down of the ZLD system is not convenient and thus it should be properly scaled by keeping future needs in mind.

Now, this is all about the ZLD system, you got to know about the challenges, importance and components of the ZLD system and if you want to setup one than make sure to contact us, we Trity Environ Solution are best in manufacturing the wastewater treatment plant you can reach us by making a call to us on 91 9821030072 or email us at enquiry@trityenviro.com.

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