Core Processes

• Pre-treatment: Involves processes such as filtration, coagulation and sedimentation, and ion exchange to remove suspended solids, organics, and other contaminants from the wastewater.
• Concentration: Utilizes membrane technologies (such as reverse osmosis, nanofiltration) or evaporation and concentration techniques to further reduce the volume of treated water.
• Crystallization: The highly concentrated liquid waste undergoes evaporation or other methods to remove the remaining water, leaving behind solid materials that can be treated as solid waste or recovered as resources.
• Reuse: The treated water can be reused in production processes, reducing the consumption of fresh water.

Characteristics

• High Water Recovery Rate: ZLD systems can recover over 90% of the wastewater.
• High Energy Consumption: Due to the involvement of evaporation and crystallization processes, ZLD systems typically have relatively high energy consumption.
• Complexity: ZLD projects usually require a combination of multiple technologies and must be customized for different types of wastewater.
• High Investment and Operating Costs: The complexity and high energy consumption of the systems result in higher initial investment and operating costs.

Application

• Power Industry: Particularly in thermal power plants, which have high water consumption and complex wastewater composition.
• Chemical and Pharmaceutical Industries: These industries often produce wastewater with high concentrations of toxic and hazardous substances that require stringent treatment through ZLD systems.
• Mining and Smelting Industry: Wastewater contains large amounts of heavy metals and other difficult-to-degrade substances.
• Textile and Dyeing Industry: Wastewater typically contains large amounts of organic pollutants and color, requiring advanced treatment.