Zero Liquid Discharge (ZLD) Treatment Plant Manufacturer

What is Zero Liquid Discharge (ZLD)?

Zero Liquid Discharge (ZLD) is an advanced wastewater treatment approach that ensures no liquid waste leaves your facility. It is ideal for industries facing water scarcity, high discharge costs, or strict environmental regulations.

ZLD may not be essential for every facility, but where it is required or makes environmental and financial sense, it plays a powerful role in turning wastewater into reusable water and manageable solids.

How Does a ZLD System Work?

At its core, a ZLD system treats wastewater, recovers clean water for reuse, and removes contaminants as solid waste. Here is a simple breakdown:

1. Pretreatment & Conditioning

• Removes suspended solids, metals, hardness, and silica
• Uses chemicals to bind fine particles and help them settle
• Produces sludge that is easy to manage

2. Phase-One Concentration

• Uses Reverse Osmosis (RO) and brine concentrators
• Recovers 60–80% of water before evaporation
• Prepares high-salinity brine for final treatment

3. Evaporation & Crystallization

• Evaporators boil off remaining water
• Crystallizers turn dissolved salts into dry solids
• Clean water is recovered for reuse

4. Reuse & Solid Waste Handling

• Treated water is stored and reused in industrial processes
• Solids are dewatered and sent for disposal or reuse

What’s Included in a ZLD System?

Every ZLD system is custom-built, but typically includes:

• Clarifier or reactor to remove hardness and metals
• Chemical dosing system for coagulation/flocculation
• Filter press for sludge dewatering
• Ultrafiltration (UF) membranes
• Reverse Osmosis (RO) system
• Brine concentrator
• Evaporator & crystallizer
• Recycle water tank & solid handling unit

Benefits of a ZLD System

• Up to 95% water recovery for reuse
• Meets stringent discharge norms
• Extracts useful byproducts like salts and brines
• Reduces environmental impact
• Converts waste into manageable solid form

Is ZLD Right for Your Industry?

ZLD is most beneficial for:

• Power plants
• Textile & dye industries
• Pharma & chemical units
• Refineries
• Any facility facing high water recovery needs

Why Choose WaTech?

With 27+ years of expertise, WaTech has been a trusted name in water treatment solutions. We offer:

• Fully customized ZLD plant designs
• Expert engineering and support
• Reliable systems built to last