Airlift Laboratory Fermenter

What is the Airlift Laboratory Fermenter?

An airlift laboratory fermenter mixes and aerates the culture with gas flow instead of a mechanical impeller. It suits shear-sensitive organisms and provides efficient oxygen transfer with low shear and low maintenance.

Overview

An airlift laboratory fermenter circulates the broth with gas introduced at the base of one section of a divided column. Rising gas lowers the density in the riser, so liquid flows upward there and downward in the adjacent downcomer, creating continuous circulation without a mechanical agitator. This design gives good oxygen transfer, uniform mixing and low shear, which suits filamentous fungi, plant cells and other shear-sensitive cultures. The vessel is usually a tall glass or stainless column with a sparger, baffle or draft tube, plus the same temperature, pH, antifoam and feed control used on stirred fermenters. Circulation rate is set by gas flow and can be cascade-controlled from dissolved oxygen. Because there are no moving parts in the culture, maintenance and contamination risk from seals are reduced, although the tall geometry requires more headroom and careful foam control.

How does it work?

A laboratory fermenter provides a sterile, mixed and aerated liquid medium in which sensors measure and controllers regulate the conditions that determine growth and product formation. Agitation by a top- or bottom-driven impeller disperses oxygen and nutrients, and air or enriched oxygen is sparged through the liquid and vented through a condenser and exhaust filter. Temperature is held by a water jacket or heating blanket, pH is corrected by dosing acid or base, and dissolved oxygen is maintained by adjusting stirrer speed, gas flow or gas composition through cascade control. Foam is managed with antifoam or a mechanical breaker, and feed pumps add carbon source in fed-batch mode. Small working volumes allow many experiments with limited material, and glass or small stainless vessels let operators observe the culture and change configuration quickly.

What are the key features?

• Gas-driven circulation without a mechanical agitator
• Low shear for sensitive cultures
• Riser and downcomer column with sparger
• Cascade control of circulation from dissolved oxygen
• Few moving parts reduces maintenance

What are the technical specifications?

A typical airlift laboratory fermenter configuration offers working volume of 1–20 L, vessel geometry of Divided column with riser and downcomer, aeration rate of 0.5–2 vvm, circulation of Gas driven, cascade controlled, temperature range of Ambient +5 to 60 °C and pH control of 2–12, ±0.05. 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 Laboratory Fermenter is used in cultivation of filamentous fungi, plant and animal cell culture, shear-sensitive bioprocesses and wastewater and environmental studies. Across the wider Laboratory Fermenters class, laboratories also deploy it for strain screening and selection, media and feed optimization and process development and scale-up studies.

Which standards and certifications apply?

Relevant standards and methods include ISO 9001, EU GMP Annex 1, 21 CFR Part 11, USP <87>, USP <88>, IEC 61010-1 and ICH Q11. Certification candidates for this model are CE, ISO 9001 manufacturing and IEC 61010-1 compliance; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Verify sterilization of the vessel, headplate and lines before inoculation, and confirm that filters and sampling ports are intact. Calibrate pH and dissolved oxygen probes before each run and check their response with standards. Record setpoints, deviations and offline measurements such as cell count and glucose, since these support interpretation and scale-up. Keep an aseptic technique for sampling to avoid contamination, and discard runs that show contamination rather than continuing. Clean probes and vessels promptly, avoid damaging electrode membranes and follow the manufacturer guidance for autoclaving. For process development records, keep batch logs that link conditions to outcomes and note any equipment changes.

How do I select the right Airlift Laboratory Fermenter?

Choose an airlift fermenter for shear-sensitive cultures or where low maintenance is valued. In an RFQ specify working volume, column geometry, aeration range, control loops, headroom and foam management, and the sensor set and data recording required.

How does it compare with other Laboratory Fermenters variants?

Choose the vessel volume from the amount of material and the number of conditions you must test, keeping headspace of about 20 to 30 percent for foam and aeration. Decide between glass, which allows observation and quick reconfiguration, and small stainless steel, which tolerates higher pressure and repeated sterilization. List the control loops you need, the number of sensor and feed ports and whether cascade control, exhaust gas analysis or redox measurement matter. If you screen many conditions, a parallel multi-vessel system with independent control saves time and material. Choose a single-use format when cleaning between experiments would slow you down. Confirm that the control software records batch profiles and exports data, and that you can scale the geometry and control strategy to pilot and production vessels.