Zero Liquid Discharge (ZLD)
Zero Liquid Discharge (ZLD) is a modern wastewater treatment concept aimed at recovering clean water from industrial effluents while leaving behind no liquid waste. The idea is to reuse as much water as possible and safely manage the remaining solids. While many companies follow the traditional route of ETP + RO + Evaporator + Dryer, this comes with high costs, complex operations, and a large plant footprint. At SED, we reimagined this process. Instead of relying on heavy pre-treatment, chemical dosing, and sludge handling, our ZLD system is built for direct effluent treatment. We remove the need for RO and ETP setups — our solution treats raw wastewater directly, returns clean water, and recovers solid residue in powder form — with no steam, no chemicals, and minimal footprint.
Industry Challenges in Traditional ZLD Systems
Most industries using the conventional ZLD route face these major problems
Large Footprint
ETPs, RO systems, cooling towers, and reboilers take up significant space.
High Energy Costs
Steam boilers and cooling systems need a lot of power and fuel.
Chemical Dependency
ETP and RO processes often rely on chemicals for pH control, coagulation, and scaling — increasing running costs.
Sludge Handling
ETPs produce large volumes of sludge that require frequent handling and disposal.
Manpower & Maintenance
Multiple systems require continuous manual supervision, cleaning, and intervention.
Scaling & Fouling
Traditional evaporators and dryers face major maintenance due to salt scaling and fouling, causing downtime.
Our Innovative Solution
Direct Effluent to Clean Water
- We take the effluent as-is (without pre-treatment).
- Our system processes it completely — evaporates the water and leaves solids behind.
No Chemicals, No Sludge
- Since we don’t use coagulants or pH modifiers, no sludge is generated.
- Eliminates the cost and Free of sludge handling and disposal.
MVR-Based Low-Temperature Evaporation
- Our evaporator works under vacuum, reducing the boiling point and cutting down energy use.
- Powered by Mechanical Vapor Recompression (MVR) — No steam needed.
- Lower operating cost, minimal heat loss, and highly efficient.
No Cooling Tower or Reboiler
- Our system doesn’t require bulky cooling towers or steam reboilers — drastically cutting CapEx and footprint.
Solid Output in Powder Form
- The final residue is a dry powder — easy to handle, store, or sell depending on its composition.
Fully Automatic & Compact
- Designed to run with minimal supervision.
- Skid-mounted options available.
- Fits into existing plants without large civil work.
Why Choose SED?
Pioneers in Steam-Free ZLD
Process Expertise
Customized Systems
Sustainable Engineering
