Continuous Stirred-Tank Fermentation Tank

What is the Continuous Stirred-Tank Fermentation Tank?

A continuous stirred-tank fermentation tank is configured for steady-state operation with continuous feed and harvest, keeping volume, dilution rate and conditions constant. It suits continuous production and steady-state physiological studies at production scale.

Overview

A continuous stirred-tank fermentation tank is designed so that fresh sterile medium enters and culture leaves at the same rate, holding a constant volume and dilution rate. The vessel is fully mixed, so substrate, product and cell concentrations are uniform and, once steady state is reached, remain constant over time. Feed and harvest are controlled by calibrated pumps or level devices, and temperature, pH and dissolved oxygen are regulated as in batch culture. Reliable sterilization of medium, stable level control, foam management and contamination prevention are critical because runs last for days or weeks. Some configurations add cell retention or cell recycle to increase productivity, and the design may include multiple tanks in series. The main advantage is constant product quality and high volumetric productivity, offset by the need to keep medium supply and sterility reliable for long periods.

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?

• Continuous feed and harvest at constant volume
• Fully mixed vessel giving uniform conditions
• Calibrated feed and level control
• Steady-state operation over days or weeks
• Optional cell retention for higher productivity

What are the technical specifications?

A typical continuous stirred-tank fermentation tank configuration offers volume of 100–50,000 L, dilution rate of 0.05–0.5 per hour, feed control of Calibrated pump or flow meter, level control of Overflow or level probe with pump, material of 316L stainless steel and agitation of Top-entry impeller, baffled. 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 Continuous Stirred-Tank Fermentation Tank is used in continuous production fermentation, steady-state physiological studies, high-productivity enzyme production and wastewater treatment modelling. 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 Continuous Stirred-Tank Fermentation Tank?

Choose a continuous stirred tank for steady-state operation or continuous production where constant quality is valuable. In an RFQ specify volume, dilution rate range, feed and level control, agitation, sterilization and cleaning design, and any cell-retention requirement.

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.