Pilot Stirred-Tank Fermenter

What is the Pilot Stirred-Tank Fermenter?

A pilot stirred-tank fermenter is a 50 to 500 litre stainless vessel with agitation, aeration and full process control. It verifies the scale-up and produces enough material for trials and production design.

Overview

A pilot stirred-tank fermenter scales up the classic impeller-agitated design to tens or hundreds of litres. The vessel is usually 316L stainless steel with a jacket or internal coil for heating and cooling, a top-entry agitator with one or more impellers, a ring sparger for gas, and a headplate carrying probes, feed lines, antifoam and a condenser with exhaust filter. Clean-in-place spray balls and sterilize-in-place steam lines allow repeated campaigns without dismantling. Control covers temperature, pH, dissolved oxygen, pressure and often foam, with cascade control adjusting agitation, gas flow and back pressure to meet oxygen demand. Sampling uses a steam-sterilized valve, and harvest can be through a bottom valve. Because scale changes mixing, oxygen transfer and heat removal, engineers select a scale-up criterion and confirm it during the run.

How does it work?

A pilot fermenter applies the same biological principles as a laboratory vessel but at a scale where mixing, oxygen transfer and heat removal behave differently. Agitation by a larger impeller and higher gas flow increase oxygen transfer, described by the volumetric mass-transfer coefficient, while a jacket or coil removes the greater metabolic heat load. Sensors for temperature, pH, dissolved oxygen, pressure and often foam or redox are placed so that readings represent the bulk liquid, and cascade control adjusts agitation, gas flow and back pressure to hold dissolved oxygen. Because mixing time and tip speed cannot all be kept equal to the laboratory scale, engineers choose the most critical criterion for the process and verify performance. Pilot vessels are usually stainless steel with clean-in-place and sterilize-in-place capability, and they include defined sampling and harvest points.

What are the key features?

• 316L stainless vessel with jacket or coil
• Top-entry agitator with one or more impellers
• Ring sparger with air, oxygen and back-pressure control
• Clean-in-place and sterilize-in-place capability
• Full process control with batch recording

What are the technical specifications?

A typical pilot stirred-tank fermenter configuration offers working volume of 50–500 L, vessel material of 316L stainless steel, temperature range of 10–60 °C, ±0.2 °C, pH control of 2–12, ±0.05, dissolved oxygen control of 0–100% with air or O2 enrichment and agitation of 50–500 rpm, impeller dependent. 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 Pilot Stirred-Tank Fermenter is used in scale-up verification, clinical and trial batch production, enzyme and metabolite production and process transfer to production. Across the wider Pilot Fermenters class, laboratories also deploy it for scale-up verification, pilot and clinical batch production and enzyme and metabolite production.

Which standards and certifications apply?

Relevant standards and methods include EU GMP Annex 1, EU GMP Annex 11, 21 CFR Part 11, 21 CFR Part 211, GB/T 150, USP <87>, USP <88>, ICH Q11 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 after installation with pressure and temperature tests and confirm cleaning and sterilization performance with documented procedures. Calibrate all probes and verify sensor placement so that readings reflect bulk conditions. Establish scale-up criteria before the first run, such as constant volumetric mass-transfer coefficient, tip speed or mixing time, and document which was chosen and why. Monitor foam, heat removal and dissolved oxygen closely, since these are the usual failure modes when moving up in scale. Keep batch records that capture setpoints, deviations and offline measurements. Manage utility supply, gaskets and seals as routine maintenance items, and review alarms after each campaign.

How do I select the right Pilot Stirred-Tank Fermenter?

Choose a pilot stirred-tank fermenter to verify scale-up under well-understood mixing. In an RFQ specify working volume, vessel material, temperature and pH ranges, agitation power, aeration and oxygen enrichment, cleaning and sterilization design and control recording.

How does it compare with other Pilot Fermenters variants?

Size the vessel to reproduce the most important laboratory parameter and to produce enough material for the next step, whether that is a clinical batch, a trial product quantity or data for production design. Decide between stainless steel, which suits repeated campaigns and higher pressures, and single-use, which shortens changeover. Confirm that the geometry, impeller type and gas handling can match the linear velocity or mass-transfer rate you intend to hold constant. List the control loops and their ranges, the number of feed, sampling and harvest ports, and whether redox, exhaust gas analysis or back-pressure control are needed. Evaluate clean-in-place and sterilize-in-place design, material certificates, records and the ability to transfer recipes to production vessels. Check service access and utility requirements before installation.