Airlift Fermentation Tank

What is the Airlift Fermentation Tank?

An airlift fermentation tank circulates the broth with gas rather than a mechanical agitator, using a tall column with a riser and downcomer. It provides low-shear mixing and efficient oxygen transfer at production scale.

Overview

An airlift fermentation tank applies gas-driven circulation at production scale, where low shear and simple internals are valuable. Gas injected at the base of the riser lowers the local density, so liquid rises there and descends through the downcomer, creating continuous circulation. An internal draft tube or an external loop defines the two zones, and the vessel is tall relative to its diameter to give a long contact path and high oxygen transfer. There are no impellers or shaft seals in the broth, which reduces shear and simplifies sterilization and cleaning. Temperature is controlled by a jacket or coil, and instrumentation covers pH, dissolved oxygen, foam and pressure. The design suits filamentous organisms and viscous broths, though building height and foam control are the main practical constraints.

How does it work?

A fermentation tank provides a contained, sterilizable volume in which the culture is mixed, aerated and temperature controlled. Geometry matters because the ratio of height to diameter, the baffles and the impeller type set the mixing pattern and the oxygen transfer achieved at a given power input. A jacket or internal coil supplies or removes heat, and the wall thickness, welding quality and surface finish support pressure containment, cleaning and sterilization. Gas is introduced through a sparger and leaves through a condenser and exhaust filter, while ports on the top or side carry probes, feeds, sampling and cleaning devices. Material grade, surface roughness, drainability and the absence of dead legs determine whether the vessel can be cleaned and sterilized reliably, and whether it meets the hygiene and pressure requirements of the process.

What are the key features?

• Gas-driven circulation without mechanical agitators
• Internal draft tube or external loop
• Tall column for long gas contact
• No shaft seals in the broth
• Jacket or coil for temperature control

What are the technical specifications?

A typical airlift fermentation tank configuration offers volume of 1,000–100,000 L, aeration rate of 0.5–2 vvm, height-to-diameter ratio of 5:1 to 10:1, material of 316L stainless steel, circulation of Riser and downcomer, gas driven and temperature control of Jacket or internal coil. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Airlift Fermentation Tank is used in filamentous fungal fermentation, viscous broth processes, wastewater treatment and low-shear production culture. Across the wider Fermentation Tanks class, laboratories also deploy it for production-scale fermentation, brewing and beverage fermentation and industrial enzyme manufacture.

Which standards and certifications apply?

Relevant standards and methods include GB/T 150, ASME BPVC Section VIII, EU GMP Annex 1, 21 CFR Part 211, USP <661>, ISO 9001 and IEC 61010-1. Certification candidates for this model are CE, ISO 9001 manufacturing and Pressure vessel compliance; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Verify the pressure rating and safety devices before operation, and never defeat relief valves or interlocks. Confirm welding, surface finish and drainability during installation because they determine whether cleaning is effective. Establish cleaning and sterilization cycles and confirm them with rinse water conductivity, swabs or biological indicators as appropriate. Inspect gaskets, seals and sparger holes for wear, since a blocked sparger causes poor oxygen transfer and a failed seal can compromise sterility. Monitor jacket and coil performance for fouling, and log pressure and temperature tests. For used or refurbished tanks, request inspection records and confirm that repairs meet the design standard before returning the vessel to service.

How do I select the right Airlift Fermentation Tank?

Choose an airlift tank for shear-sensitive or viscous production culture and when low maintenance is valuable. In an RFQ specify volume, column height and required headroom, aeration and loop design, temperature control, foam management and instrumentation.

How does it compare with other Fermentation Tanks variants?

Start from the volume, the organism and the process. Choose the geometry from the mixing and oxygen transfer requirements: tall and narrow columns favor gas-driven circulation, while wider vessels with baffles and multiple impellers suit high power input. Decide on jacketed or coil design from the heat load, and confirm the design pressure and temperature with the sterilization method. Specify the material grade, typically 316L, and the surface finish and welding standard so that clean-in-place and sterilize-in-place are effective. List the ports and their functions, including probes, feeds, sampling, foam and cleaning devices, and check the positions for reliable measurement. For regulated production, request design documents, material certificates, pressure test records and the qualification package.