A Zero Liquid Discharge (ZLD) system is a wastewater treatment process designed to eliminate liquid waste discharge from an industrial facility. The goal is to recover and reuse nearly all water while converting dissolved contaminants into solid waste for disposal or recovery.
Zero Liquid Discharge (ZLD) System employ the most advanced wastewater treatment technologies to purify and recycle virtually all of the wastewater produced. Dew provides equipment for industrial and sewage treatment plants to effectively reuse their wastewater effluent in order to achieve zero liquid discharge.
Zero Liquid Discharge (ZLD) systems provide numerous economic and environmental advantages for plant managers-water is recycled and reused, saving on the cost and treatment of raw water.
At Dew, we are dedicated to delivering innovative Zero Liquid Discharge (ZLD) solutions tailored to the unique requirements of industrial and sewage treatment plants.
At Dew, we offer a suite of advanced processes to efficiently manage water cycles for industrial applications, addressing the pressing need for sustainable water management and conservation. Our range of processes includes:
- Filtration and Segregation
- Biological Treatment
- Physical and Chemical Separation
- Chemical Treatment
- Sludge Treatment
- Concentrate Recovery and Treatment
How a ZLD System Works
A typical ZLD system consists of the following stages:
Pre-treatment
- Removes suspended solids, oils, hardness, and heavy metals.
- Common processes:
- Coagulation and flocculation
- Clarification
- Filtration
- pH adjustment
Membrane Treatment
- Concentrates wastewater while recovering clean water.
- Technologies include:
- Ultrafiltration (UF)
- Reverse Osmosis (RO)
- Nanofiltration (NF)
Thermal Concentration
- The concentrated brine from the membrane system is further concentrated using:
- Brine concentrator
- Multiple-effect evaporator (MEE)
- Mechanical Vapor Recompression (MVR)
- The concentrated brine from the membrane system is further concentrated using:
Crystallization
- Remaining dissolved salts are crystallized into solid form using a crystallizer.
Solid Handling
- The crystals are separated, dried, and disposed of or reused if valuable.
Water Recovery
- Distilled water from evaporation and permeate from RO are recycled back into the process.
Zero Liquid Discharge (ZLD) Systems: A Sustainable Solution
In response to the increasing scarcity of freshwater resources, environmental concerns regarding industrial wastewater discharge, and tightening regulatory controls, Dew provides cutting-edge Zero Liquid Discharge (ZLD) systems. These systems offer numerous advantages, including:
- Removal of dissolved solids from wastewater, returning distilled water to the process
- Utilization of reverse osmosis (membrane filtration) to concentrate waste streams, minimizing the volume requiring further treatment
- Energy-efficient falling film evaporation to concentrate water up to crystallization point, followed by forced-circulation crystallization to form crystals
- Dewatering of crystal-laden brine and recycling of collected condensate, eliminating liquid discharge
Customized Zero Liquid Discharge ( ZLD) Solutions from Dew
With over 20 years of expertise in designing, delivering, commissioning, and servicing ZLD systems, Dew offers a comprehensive portfolio of technologies tailored to your specific needs. Our ZLD solutions incorporate a range of equipment, including ultrafiltration (UF), reverse osmosis (RO), electrodeionization (EDI), and ion exchange, ensuring optimal performance.
Key Features of Dew Zero Liquid Discharge (ZLD) Systems:
- Potential reduction in water consumption by up to 90%, leading to cost savings and environmental protection
- Comprehensive range of technologies, including brine concentrators, evaporators, and crystallizers
- Tailored solutions to fit your wastewater characteristics, flow rates, and end-product requirements
Benefits of Zero Liquid Discharge (ZLD) Evaporator and Crystallizer Systems:
- Recovery of distilled water from waste streams
- Reduction of wastewater discharge, with potential capture of valuable by-products
- Flexibility to adjust treatment processes based on specific plant needs
Comprehensive Support from Dew
Dew also offers pilot treatment systems and analytical testing to ensure the efficacy of treatment prior to installation. Additionally, we provide parts and service for all equipment, including those from other manufacturers, ensuring uninterrupted operation.
Experience the benefits of sustainable water management with Dew’s innovative ZLD solutions. Contact us today to learn more about how our advanced processes can enhance efficiency, reduce environmental impact, and meet regulatory requirements for your industrial water treatment needs.
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