Airlift Stainless Steel Bioreactor

What is the Airlift Stainless Steel Bioreactor?

An airlift stainless steel bioreactor circulates the broth with gas rather than an agitator, using a riser and downcomer. It provides low-shear, energy-efficient mixing with simple internals at pilot and production scale.

Overview

An airlift stainless steel bioreactor uses gas injected at the base of the riser to lower local density, so liquid rises there and flows down the downcomer, giving continuous circulation without an impeller. An internal draft tube or an external loop defines the two zones, and the tall column provides a long gas-liquid contact path for efficient oxygen transfer. Because there are no shaft seals or impellers in the broth, shear is low, maintenance is simpler and sterilization and cleaning are easier to validate. 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, foam control and oxygen limitation at very high densities are the main practical constraints.

How does it work?

A stainless steel bioreactor provides a durable, pressure-rated and cleanable environment for cell culture or fermentation. The vessel is built from 316L or comparable stainless steel with hygienic welds and a smooth interior, and heat is supplied or removed through a jacket or internal coil. Mixing is by impeller, gas-driven circulation or a packed bed, and a sparger introduces air, oxygen, nitrogen and carbon dioxide. Because the vessel is reusable, it must be cleaned and sterilized between batches: spray devices and validated cleaning cycles remove soil, and steam sterilization raises all product-contact surfaces above the required temperature. Sensors for temperature, pH, dissolved oxygen, pressure and level are mounted in hygienic fittings, and the control system holds setpoints and records the batch.

What are the key features?

• Gas-driven circulation with riser and downcomer
• Internal draft tube or external loop
• Low shear with no seals in the broth
• Tall column for efficient oxygen transfer
• Clean-in-place and sterilize-in-place design

What are the technical specifications?

A typical airlift stainless steel bioreactor configuration offers working volume of 50–100,000 L, height-to-diameter ratio of 5:1 to 10:1, material of 316L stainless steel, aeration rate of 0.5–2 vvm, temperature control of Jacket or internal coil and design pressure of 0.1–0.3 MPa. 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 Stainless Steel Bioreactor is used in filamentous fungal fermentation, viscous broth production, low-shear cell culture and wastewater treatment. Across the wider Stainless Steel Bioreactors class, laboratories also deploy it for pilot and production bioprocessing, monoclonal antibody manufacturing and vaccine and viral vector production.

Which standards and certifications apply?

Relevant standards and methods include GB/T 150, ASME BPVC Section VIII, EU GMP Annex 1, EU GMP Annex 11, 21 CFR Part 11, 21 CFR Part 211, USP <661>, ISO 13485 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.

Qualify the vessel and its utilities before the first run, covering pressure, temperature and cleaning performance. Establish and validate clean-in-place and sterilize-in-place cycles, then confirm them periodically with rinse water conductivity, swabs or biological indicators as appropriate. Calibrate probes and verify their position so that readings reflect bulk conditions, and replace gaskets, seals and diaphragms on schedule. Monitor jacket and coil fouling, agitator seals and sparger condition, since these affect heat transfer, sterility and oxygen supply. Keep the automated control system under change control with audit trails enabled, and retain batch records, alarm logs and maintenance history.

How do I select the right Airlift Stainless Steel Bioreactor?

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

How does it compare with other Stainless Steel Bioreactors variants?

Choose stainless steel when you need repeated campaigns, higher pressure, intensive mixing or full sterilization at scale. Select the mixing principle from the cell type and oxygen demand, and confirm the design pressure and temperature against the sterilization method. Specify the material grade, surface finish and welding standard so that clean-in-place and sterilize-in-place are effective, and define the port list for probes, feeds, sampling, foam and cleaning devices. Decide whether the vessel needs a jacket, a coil or both, and check agitation power and gas handling against the expected oxygen uptake rate. Confirm control, data recording and audit-trail capability, and request design documents, material certificates, pressure test records and a qualification package.