Zero Liquid Discharge (ZLD) System

Zero Liquid Discharge (ZLD) Systems for Complete Water Recovery

As pollution control norms tighten and water scarcity concerns grow across Gujarat's industrial belt, more facilities are moving beyond standard effluent treatment toward complete water recovery. Renora Hydrotech designs, manufactures, installs, and commissions complete Zero Liquid Discharge (ZLD) systems tailored to each industry's specific wastewater characteristics — helping businesses eliminate liquid discharge entirely while recovering water for reuse.

What is a Zero Liquid Discharge (ZLD) System?

A Zero Liquid Discharge system is an advanced wastewater treatment process that recovers reusable water from industrial effluent while converting the remaining dissolved solids into solid waste for safe disposal. The objective of a ZLD plant is to ensure that no liquid waste is discharged into the environment — instead, water is treated, recovered, and reused within the facility, with only a small volume of solid residue requiring disposal.

ZLD systems are widely adopted in industries where water conservation, environmental compliance, and wastewater reuse are business-critical, particularly for red-category, high-pollution-load industries operating under strict GPCB and CPCB norms.

Our Complete ZLD Process

Renora Hydrotech engineers ZLD systems as an integrated treatment train, combining the following stages:

1. Dissolved Air Flotation (DAF) System — Removes suspended solids, oils, grease, and other floating contaminants using dissolved air bubbles, significantly reducing the load on downstream treatment equipment and improving overall system efficiency.
2. Pressure Sand Filter (PSF) — Effectively removes fine suspended particles, turbidity, and impurities, ensuring cleaner water before membrane filtration.
3. Activated Carbon Filter (Optional) — For applications requiring removal of colour, odour, chlorine, and organic contaminants, activated carbon filtration enhances water quality and protects RO membranes from fouling.
4. Pressure Vessels & Media Filtration Units — High-quality filtration vessels designed for reliable performance under varying operating conditions, ensuring efficient filtration and long service life.
5. Reverse Osmosis (RO) Plant — Recovers a major portion of treated water by removing dissolved salts, minerals, and contaminants. The recovered water can be reused in industrial processes, significantly reducing freshwater consumption.
6. Evaporator System — The RO reject stream is further treated in an evaporator, where remaining water is separated through evaporation and recovered for reuse. The final concentrated slurry is processed for solid waste disposal, achieving complete Zero Liquid Discharge.

Why Industries Choose Renora Hydrotech's ZLD Systems

1. High Water Recovery Efficiency — Up to 95–99% water recovery depending on wastewater quality, drastically reducing dependence on freshwater sources.
2. Regulatory Compliance — Systems designed to meet GPCB and CPCB environmental regulations for industries mandated to achieve zero discharge.
3. Customized Design — Every ZLD system is engineered based on thorough wastewater analysis specific to your facility's effluent characteristics.
4. Robust, Energy-Efficient Construction — Built for reliable, low-maintenance operation even under continuous high-TDS process conditions.
5. Automation Ready — PLC/SCADA integration available for facilities wanting centralized monitoring and control across all treatment stages.
6. End-to-End Execution — From engineering and manufacturing to installation, commissioning, and operator training — all handled by one accountable team.

Industries & Applications We Serve

• Textile & dyeing industries
• Pharmaceutical industries
• Chemical manufacturing
• Food & beverage processing
• Paper & pulp industries
• Electroplating plants
• Power plants
• Automotive industries
• Industrial parks & Common Effluent Treatment Plants (CETPs)

Our ZLD System Design & Delivery Process

1. Effluent Characterization — We conduct thorough wastewater analysis to understand your specific TDS, contaminant profile, and flow rate before designing your system.
2. Custom System Engineering — Each treatment stage — DAF, filtration, RO, and evaporation — is sized and configured based on your facility's wastewater analysis and water recovery targets.
3. Manufacturing & Quality Control — All equipment, including pressure vessels and filtration units, is manufactured in-house for reliable performance and long service life.
4. Installation & Commissioning — Complete on-site installation and system commissioning, including operator training for smooth day-to-day operation.
5. After-Sales Support — Responsive AMC (Annual Maintenance Contract) support and ongoing service to keep your ZLD system performing reliably over the long term.

Benefits of Choosing a ZLD System

• Up to 95–99% water recovery (depending on wastewater quality)
• Significant reduction in water procurement costs
• Zero wastewater discharge
• Reduced environmental footprint
• Long-term operational savings
• Improved sustainability and ESG performance
• Reliable and consistent plant operation

Why Choose Renora Hydrotech for Your ZLD Project

Unlike vendors who supply individual components, Renora Hydrotech engineers, manufactures, and delivers the complete ZLD treatment train — DAF, filtration, RO, and evaporation — as a single integrated system. This means better overall water recovery, optimized performance across all stages, and one accountable partner from initial wastewater analysis through installation, commissioning, and long-term AMC support.

Frequently Asked Questions

Is ZLD mandatory for all industries?
Not for all — GPCB and CPCB typically mandate ZLD for red-category, high-pollution-load industries such as textile dyeing, chemical manufacturing, and pharmaceuticals, particularly in water-stressed regions like Gujarat.

How much water can a ZLD system recover?
Depending on wastewater quality, Renora Hydrotech's ZLD systems can achieve up to 95–99% water recovery, leaving only a small quantity of solid residue for disposal.

What happens to the concentrated slurry from the evaporator stage?
The final concentrated slurry is processed and disposed of as solid waste through authorized waste handling channels, completing the zero-liquid-discharge objective.

Can an existing ETP be upgraded into a full ZLD system?
Yes, Renora Hydrotech regularly designs ZLD upgrades for facilities with existing treatment infrastructure, adding DAF, RO, and evaporation stages to achieve full zero-discharge compliance.

Does Renora Hydrotech provide automation for ZLD systems?
Yes, PLC/SCADA integration is available for facilities that want centralized monitoring and control across all ZLD treatment stages.

What kind of after-sales support is available?
We provide installation, commissioning, and operator training, along with responsive after-sales service and AMC (Annual Maintenance Contract) support for long-term reliable operation.