ZERO LIQUID DISCHARGE
Zero Liquid Discharge (ZLD) Systems Manufacturer in India | Water Recovery Solutions
Zero Liquid Discharge (ZLD) systems are advanced water recovery solutions designed to eliminate liquid discharge from industrial and municipal wastewater treatment processes. These systems recover nearly all water from effluents, leaving only solid residues for safe disposal or reuse.
As a trusted Zero Liquid Discharge (ZLD) systems manufacturer in India, we provide customized solutions for industrial water recovery, wastewater minimization, and sustainable water management.
1. Introduction
Industrial wastewater often contains dissolved solids, organic matter, oils, and chemicals that require advanced treatment. ZLD systems eliminate liquid discharge by recovering almost all water and converting waste into reusable water and solid residues.
Our ZLD systems integrate ultrafiltration, reverse osmosis, evaporators, crystallizers, and advanced separation technologies for maximum efficiency and sustainability.
2. Importance of ZLD Systems
- Eliminates liquid waste discharge into the environment
- Ensures strict environmental compliance
- Enables high water recovery and reuse
- Reduces environmental pollution and ecological impact
- Improves industrial water management efficiency
3. Key Benefits
Elimination of Liquid Discharge
Recovers nearly all water, leaving only solid residues.
Environmental Compliance
Ensures zero discharge into natural water bodies, meeting strict regulations.
Water Conservation & Reuse
Maximizes reuse of treated water in industrial operations.
Cost Efficiency
Reduces freshwater procurement and wastewater disposal costs.
Sustainability
Minimizes environmental footprint through complete water recovery.
Process Efficiency
Ensures continuous supply of high-quality reusable water.
4. Core Features of ZLD Systems
Ultrafiltration (UF)
Function: Removes suspended solids and large particles.
Impact: Prepares water for advanced treatment stages.
Reverse Osmosis (RO)
Function: Removes dissolved salts and contaminants using membranes.
Impact: Produces high-quality reusable water.
Evaporators
Function: Concentrates wastewater by evaporating water.
Impact: Reduces liquid volume and recovers water.
Crystallizers
Function: Converts dissolved solids into crystals.
Impact: Enables safe disposal or reuse of solids.
Advanced Separation Technologies
Function: Includes membrane distillation and electrolysis methods.
Impact: Enhances recovery efficiency for complex effluents.
5. Technical Specifications
| Component | Specifications |
|---|---|
| Capacity Range | 10 m³/day – 5000 m³/day (customizable) |
| Technologies | UF, RO, Evaporation, Crystallization, Advanced separation |
| Material of Construction | SS 304 / SS 316 / FRP |
| Operating Pressure | UF/RO: 1–30 bar; Evaporator: Thermal/steam based |
| Water Recovery Rate | Up to 98–99% depending on feedwater |
| Automation | PLC / SCADA Monitoring & Control |
| Power Supply | 415 V / 3 Phase / 50 Hz |
| Maintenance | Membrane cleaning, crystallizer inspection, residue handling |
6. Process Flow of ZLD Systems
- Raw Effluent Intake: Screening removes large debris.
- Ultrafiltration (UF): Removes suspended solids.
- Reverse Osmosis (RO): Produces high-quality permeate water.
- Evaporation: Concentrates brine and recovers water.
- Crystallization: Converts dissolved solids into crystals.
- Water Recovery: Condensed water reused in processes.
- Solid Waste Handling: Crystals disposed or reused safely.
7. Industries Served
- Power Generation: Cooling and boiler water recovery.
- Oil & Gas: Produced water and refinery effluent treatment.
- Chemical & Fertilizers: Process water recovery and reuse.
- Hospitality: Wastewater reuse for landscaping and cooling.
- Food & Beverage: Water recovery from process effluents.
- Textile Industries: Dye wastewater treatment and reuse.
- Real Estate: Sewage reuse for irrigation and cooling.
- Pharmaceuticals: Solvent and effluent treatment for compliance.
- Pulp & Paper: Process water recovery and reuse.
- Mining & Electronics: Industrial effluent recycling.
8. Case Studies
Case Study 1: Power Plant ZLD – 1200 m³/day
Challenge: High TDS wastewater causing disposal issues.
Solution: UF + RO + evaporator + crystallizer system.
Outcome: 98% water recovery and zero liquid discharge achieved.
Case Study 2: Pharmaceutical ZLD – 500 m³/day
Challenge: Solvent-laden wastewater.
Solution: RO + thermal evaporation + crystallization.
Outcome: Safe reuse of water and compliant residue management.
Case Study 3: Textile ZLD – 800 m³/day
Challenge: Dye wastewater with high pollution load.
Solution: UF + RO + evaporation + crystallization.
Outcome: Eliminated discharge and enabled water reuse.
Frequently Asked Questions (FAQs)
ZLD systems are water recovery solutions that eliminate liquid discharge by recovering water from wastewater and leaving only solid residues.
ZLD systems are water recovery solutions that eliminate liquid discharge by recovering water from wastewater and leaving only solid residues.
A company that designs, supplies, and installs ZLD systems for industrial and municipal wastewater treatment applications.
Yes, the recovered water is safe for industrial processes, cooling, irrigation, or other non-potable applications.
Pharmaceuticals, food & beverages, chemicals, textiles, power generation, oil & gas, mining, real estate, and municipal water treatment.
Crystallized solids can be safely disposed of in compliance with environmental norms or reused in industrial applications where appropriate.
We provide various equipment for effective treatment of waste water to ZLD waste water to zld norms after initial treatment Zero Liquid Discharge is a classification of water treatment processes intended to reduce wastewater efficiently and produce clean water that is suitable for reuse.
Zero Liquid Discharge (ZLD)
The ZLD system uses a variety of modern wastewater treatment technologies to store, collect, and reuse ‘treated’ wastewater, ensuring that no wastewater is discharged into the environment.
Installation of equipment and systems that allow industrial effluent to be entirely cycled via permeate and converted to solid utilizing a concentration and heat evaporation process for the dissolved organic and inorganic compounds and salts. ZLD systems employ wastewater treatment technologies and desalination to purify and recycle virtually all wastewater received.
- Involves a range of advanced water treatment technologies.
-
Pre-treatment: Waste water is filtered using membrane technologies such as ultra-filtration, Reverse osmosis etc. separated water is reused, and a concentrate (polluted stream)
is further treated. -
Evaporation: The concentrate is next sent through a brine concentrator, which is a mechanical evaporator that uses a
mix of heat and vapor compression to produce wet sludge. - Crystallization:Using high pressure steam, the sludge is converted to solid waste, and any residual water is clean enough to reuse.
- A Common ZLD approach is to concentrate the wastewater through well designed multiple membrane systems and then dispose of it as a liquid brine or further crystallize the brine to a solid.
- A typical evaporator uses tube-style heat exchangers. The evaporated water is recovered and recycled while the brine is concentrated to a higher solids Concentration.
- Concentrated brine treatment is done in a crystallizing system, such as Agitated Thin Film Dryer (ATFD) or a spray dryer. Crystallized solids in most of the cases is categorized as hazardous waste and disposed off periodicall
- Several advantages come with implementing ZLD, such as, corporate accountability, and environmental care. By decreasing off-site trucking, running an internal ZLD plant can save disposal costs, promote water reuse, and reduce greenhouse gas emissions. As a result, the climate and nearby ecosystems are less affected.