Mechanical Vapour Recompression

MVR Evaporator
High-Efficiency ZLD System

Rototech's MVR evaporators use mechanical vapour recompression to recycle vapour energy — cutting steam consumption by up to 90% versus conventional multi-effect evaporation. Ideal for ZLD, RO reject, and high-volume wastewater treatment.

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90% less steamvs. conventional MEE

High capacity1,000 – 50,000 L/hr

ISO CertifiedManufacturing & QA

Turnkey EPCDesign to commissioning

Rototech MVR Evaporator System — Mechanical Vapour Recompression for ZLD

Manufactured in Ahmedabad, Gujarat, India

ISO Certified 90% Energy Saving ZLD Ready

How It Works

What is an MVR Evaporator?

In a Mechanical Vapour Recompression (MVR) evaporator, the secondary vapour generated during evaporation is recompressed by a mechanical compressor (centrifugal or roots-type blower) and returned as the heating medium. This closed-loop vapour cycle eliminates the need for large quantities of fresh steam, dramatically reducing operating costs.

Rototech designs falling film, forced circulation, and rising film MVR configurations depending on your effluent type, viscosity, and fouling tendency. All systems are engineered with your site utilities, effluent chemistry, and ZLD compliance targets in mind.

Working Principle

The evaporator is a Single-effect MVR (Mechanical vapor Re-compressor) evaporator. The feed (process effluent) is fed to Calandria-1 through a Plate Type Heat Exchanger and Shell and Tube Heat Exchanger, where the feed is preheated by condensate generated from the system. The feed material is circulated through the Calandria and vapor separator by a circulation pump, and the final product is discharged at the desired rate and concentration.

Initial preheating is achieved by introducing live steam at 1.5 bar (g) to the shell side of the Calandria. Once operational, evaporated vapours from the Calandria are compressed in the MVR unit. These compressed superheated vapours are then used as the heating medium for the same Calandria to heat the circulated feed material in the tubes. Vapours get condensed, collected in a condensate pot, and removed via a condensate pump.

The system works on the forced circulation principle, maintaining a constant circulation between the vapor separator and Calandria to achieve optimal velocities and prevent fouling. The liquid gains sensible heat in the Calandria and flashes in the vapor separator. Non-condensable gases are parallel drawn and sent to a vacuum pump hooked up to the condenser for efficient removal.

Exceptional Energy Savings

Steam consumption reduced to near zero — only electricity for the compressor is required.

Compact Footprint

Single-effect MVR achieves the economy of 8–10 effects in a smaller plant footprint.

Stable Continuous Operation

Automatic load-following via compressor speed control; suitable for 24×7 continuous operation.

Low Maintenance Design

CIP-compatible heat exchangers, easy-access tube bundles, and corrosion-resistant MOC options.

Technical Data

MVR Evaporator Specifications

Parameter	Details
Evaporation Capacity	1,000 – 50,000 litres/hour (customisable)
Steam Economy	8–12 kg water evaporated per kg steam equivalent
Heat Source	Mechanical vapour compressor (centrifugal / roots type)
Configuration	Falling film, forced circulation, rising film
MOC Options	SS 304, SS 316L, Duplex, Hastelloy, Titanium
Operating Pressure	Vacuum to 3 bar (process dependent)
Feed TDS Range	Up to 2,50,000 mg/L
CIP Provision	Standard
Instrumentation	PLC/SCADA with remote monitoring
Installation	Turnkey EPC, skid-mounted, or modular

Use Cases

Where MVR Delivers Best

ZLD & RO Reject

Economically evaporate high-TDS RO reject and brine streams to achieve zero liquid discharge compliance.

Pharmaceutical Effluent

API wastewater with complex COD profiles — MVR handles high-strength streams with stable operation.

Chemical & Dyes

Concentration and volume reduction of dye bath effluent, salt recovery, and chemical plant wastewater.

Textile & Dyeing

Reduce ETP load by concentrating wash water before biological treatment or final disposal.

CETP & ETP

Modular MVR for industrial park ETPs handling mixed streams from multiple industries.

Distillery Spent Wash

High-organic spent wash concentration prior to ATFD or incineration for energy recovery.

FAQ

MVR Evaporator Questions

How much energy does an MVR evaporator save vs. MEE?

An MVR evaporator typically consumes only 10–15 kWh of electricity per tonne of water evaporated, compared to 150–200 kg of steam in a single-effect evaporator. This represents an energy saving of 80–95%.

Which industries is MVR most suitable for?

MVR is ideal for pharma, chemical, textile, distillery, and CETP operations where large volumes of wastewater need evaporation and the cost of steam is high.

Can MVR handle high-TDS or scaling effluents?

Yes. Rototech designs MVR systems with forced circulation or scraped surface configurations for high-TDS or scaling-prone effluents. Anti-scaling MOC (Duplex, Titanium) and CIP provisions are included as standard.

What does a turnkey MVR project from Rototech include?

We provide complete EPC: process design, P&ID, custom fabrication, electrical & instrumentation, civil liaison, erection & commissioning, operator training, and performance guarantee trials.

Need an MVR system for your effluent?

Share your effluent flow rate, TDS, and COD — our engineers will size the system and provide a detailed proposal.

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MVR EvaporatorHigh-Efficiency ZLD System