Heavy-duty thermal concentration and drying infrastructure designed to eliminate liquid waste entirely, recover pure condensate, and crystallize solid salts.
Multiple Effect Evaporator (MEE) Systems for the concentration and volume reduction of high-TDS wastewater, RO reject, process effluent and other difficult-to-treat industrial streams. MEE systems use multiple evaporation effects operating at progressively lower pressures and temperatures, allowing vapour generated in one effect to be reused as the heating medium for the next effect. This enables efficient utilization of thermal energy compared with single-effect evaporation. MEE systems are widely used as part of Zero Liquid Discharge (ZLD), wastewater concentration and water-recovery systems.
The feed is introduced into the evaporation system and heated under controlled operating conditions. In a multiple-effect arrangement, vapour generated from one evaporation effect is reused to provide heating to the subsequent effect. Each successive effect generally operates at a lower pressure and corresponding boiling temperature. This cascading utilization of vapour reduces the external steam requirement and improves overall thermal efficiency.
Mechanical Vapor Recompression (MVR) Evaporation Systems for the concentration and volume reduction of high-TDS wastewater, RO reject, process effluent and other challenging industrial streams. MVR technology uses a mechanical compressor or blower to recompress the generated secondary vapour, increasing its pressure and saturation temperature so that it can be reused as the heating medium within the evaporator. By recycling the vapour within the evaporation process, MVR can significantly reduce the requirement for continuous external steam compared with conventional evaporation systems.
The feed enters the evaporator and is heated under controlled vacuum or low-pressure conditions. As water evaporates, the generated secondary vapour is directed to the Mechanical Vapor Recompressor (MVR). The compressor increases the vapour pressure and temperature.
The recompressed vapour is then returned to the heat-transfer section of the evaporator, where it provides the energy required to evaporate additional water.
Agitated Thin Film Dryer (ATFD) systems for the thermal drying and solidification of concentrated wastewater streams generated in Zero Liquid Discharge (ZLD) and industrial wastewater treatment systems. An ATFD is designed to handle concentrated liquors, slurries and difficult-to-process streams by spreading the feed into a thin, highly turbulent film over a heated surface. A rotating agitator continuously renews the film, promoting efficient heat transfer and evaporation while reducing the tendency for solids to form a stagnant layer on the heat-transfer surface. The system is particularly suitable for MEE concentrates, RO reject concentrates and high-TDS industrial wastewater, where further evaporation and moisture removal are required to achieve near-zero liquid discharge.
The concentrated feed enters the ATFD and is distributed over the heated internal surface. A mechanically driven rotor continuously agitates and spreads the material into a thin film.
The continuous agitation provides:
As moisture evaporates, the remaining material becomes progressively concentrated and eventually forms a dry or semi-dry solid, which is discharged from the dryer.
A Solvent Stripper is a wastewater treatment unit used to remove volatile organic compounds (VOCs) and volatile solvents from industrial wastewater by transferring them from the liquid phase into a gas phase, usually using steam, air, or another suitable stripping medium.
In chemical, pharmaceutical, petrochemical and specialty chemical industries, solvent stripping is often used as a pretreatment step before biological treatment, MEE, RO or a Zero Liquid Discharge (ZLD) system.
The process operates on the principle of volatilization and mass transfer. When wastewater contacts steam or stripping gas inside a packed or tray column, volatile solvents transfer from the liquid into the gas phase. The solvent-rich vapour is then sent to a condenser and/or vapour recovery system, while the treated wastewater exits from the bottom of the column.
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