Drying Technology

Agitated Thin Film Dryer (ATFD)
Concentrate to Dry Solid

Rototech's ATFD systems handle high-viscosity, sticky, or fouling-prone feeds that no conventional evaporator can process — converting MVR/MEE concentrate into a dry, disposable solid in a single pass. Essential for ZLD completion.

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Wiped-Film DesignSticky/viscous feeds
Single-PassNo recirculation needed
ZLD Final StepComplete drying to solid
ISO CertifiedManufacturing & QA
Rototech ATFD — Agitated Thin Film Dryer for ZLD Final Step
Manufactured in Ahmedabad, Gujarat, India
ISO Certified ZLD Ready Custom Built
Technology

How ATFD Works

In an ATFD, concentrate is fed at the top of a jacketed, vertical cylindrical body. Rotor-mounted wiper blades spread the feed as a very thin, continuously agitated film on the hot inner wall. Rapid evaporation occurs across the film, and the dried solid (powder, granules, or flakes) is collected at the bottom. The vapour travels upward to an internal condenser. Rototech manufactures single-pass ATFDs with steam-jacketed or thermic-fluid-heated bodies, handling feeds from 10% to 80% solids in a single unit.

Handles Viscous/Fouling Feeds

Rotor blades prevent wall fouling — processes feeds up to 80% solids that clog conventional evaporators.

Compact Single-Pass Design

No recirculation pump needed. Short residence time preserves heat-sensitive products.

Multiple Heat Sources

Steam jacket, thermic fluid, or hot water — accommodated to your site utility.

Premium MOC Options

SS 316L body and rotor, Hastelloy C-276, or Titanium for corrosive ZLD brine streams.

Technical Data

ATFD Specifications

Parameter Details
Evaporation Rate 25 – 2,000 kg/hr (water evaporated)
Feed Concentration 10 – 80% total dissolved solids
Operating Pressure Vacuum (−0.8 to −0.9 bar) to atmospheric
Heat Source Steam jacket / thermic fluid / hot water
Rotor Material SS 316L, Hastelloy C-276, Titanium
Product Form Dry powder, granules, or flakes
Instrumentation PLC/SCADA with feed rate and pressure control
Applications

ATFD Use Cases

ZLD Final Step

Complete zero liquid discharge by converting MEE/MVR concentrate into disposable dry solid.

Distillery Spent Wash

Convert pre-concentrated spent wash to dry bio-manure or fuel cake in a single ATFD pass.

Pharma Effluent

Dry pharmaceutical mother liquors and API waste streams under high vacuum.

Chemical Sludge

Dry sticky chemical sludge and polymer concentrates that clog conventional dryers.

FAQ

ATFD Questions

ATFD handles high-viscosity, sticky, or high-TDS concentrates that cannot be atomised in a spray dryer. ATFD processes feeds from 10–80% solids through mechanical wiping, while spray dryers work best with pumpable, low-viscosity feeds.

Yes. Rototech ATFDs routinely operate at −0.8 to −0.9 bar vacuum, enabling drying temperatures of 50–70°C for heat-sensitive products.

Complete your ZLD system with an ATFD

Share your concentrate analysis — % solids, viscosity, heat sensitivity — and our engineers will select the right ATFD configuration.

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