The main bioreactor types are stirred-tank (the workhorse of cell culture), single-use/disposable, airlift, packed-bed, and wave/rocking systems – each suited to different scales and processes. Paul Industries installs bioreactors and the WFI, clean steam, and sanitary piping utilities they run on.
Common bioreactor types
| Type | Typical use |
|---|---|
| Stirred-tank (STR) | The standard for microbial and mammalian cell culture at most scales |
| Single-use / disposable | Faster changeover, no CIP/SIP between batches; clinical and flexible manufacturing |
| Airlift | Low-shear mixing via gas sparging; shear-sensitive cultures |
| Packed-bed / fixed-bed | Adherent cells on a matrix; cell and gene therapy |
| Wave / rocking | Small-to-mid single-use culture, seed trains |
Bioreactors and their utilities
Whatever the type, a bioreactor depends on clean utilities – WFI, clean steam for SIP (on stainless systems), sanitary piping, and controls. Single-use systems reduce cleaning but still need supporting infrastructure. Paul Industries builds and integrates that infrastructure.
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Frequently asked questions
What is the difference between stainless steel and single-use bioreactors?
Stainless bioreactors are permanent, cleaned and sterilized in place via CIP/SIP, and favored at large scale and high batch frequency. Single-use bioreactors use pre-sterilized disposable bags, cutting cleaning, cross-contamination risk and changeover time, and suit multi-product or smaller-scale operations. The choice balances capital against consumable cost.
What is a stirred-tank bioreactor?
A stirred-tank bioreactor is the most common design, a jacketed vessel with one or more impellers that mix media, distribute gas and control temperature. It handles microbial and mammalian cultures across scales. Impeller type and speed are matched to the cells’ shear tolerance and oxygen demand.
What is an airlift bioreactor?
An airlift bioreactor circulates and mixes culture using injected gas rather than a mechanical impeller, creating flow between a riser and downcomer. With no stirrer, it delivers gentle, low-shear mixing suited to shear-sensitive cells, though oxygen transfer and mixing control are less flexible than stirred tanks.
When would you choose a wave or rocking bioreactor?
Wave or rocking bioreactors mix a single-use bag on a rocking platform, giving very low shear and simple operation. They suit seed-train expansion, small-to-mid mammalian and stem-cell cultures, and rapid product changeover. They do not scale as large as stirred tanks but excel at flexible, low-volume work.
What is a packed-bed bioreactor used for?
A packed-bed bioreactor immobilizes cells on a fixed matrix while media perfuses through, achieving high cell density with low shear. It suits adherent cell cultures and some perfusion processes. The trade-off is more complex scale-up and monitoring compared with suspension stirred-tank systems.
What is a perfusion bioreactor?
A perfusion bioreactor continuously feeds fresh media and removes spent media while retaining cells, sustaining high viable-cell density and prolonged production. It contrasts with batch and fed-batch modes. Perfusion needs a cell-retention device and tighter process control but boosts productivity per volume.
What is the difference between batch, fed-batch and continuous bioreactors?
Batch runs a fixed charge to completion. Fed-batch adds nutrients over time to extend growth and yield, the most common biopharma mode. Continuous, including perfusion, feeds and harvests steadily for extended runs. Mode selection depends on product stability, titer goals and regulatory strategy.
What is a photobioreactor?
A photobioreactor cultivates photosynthetic organisms such as algae and cyanobacteria using controlled light alongside gas exchange and mixing. Designs include tubular, flat-panel and column formats. They serve biofuel, nutraceutical and specialty-chemical production where light delivery, not just aeration, drives growth.
Which bioreactor type suits mammalian cell culture?
Mammalian cells are shear-sensitive, so stirred tanks with low-shear impellers, wave/rocking systems, or perfusion designs are common. Single-use formats dominate at clinical and mid scale for their low cross-contamination risk. The choice depends on cell line, titer target and production scale.
How does scale affect bioreactor type selection?
Small development and seed stages favor benchtop, wave or single-use systems for speed and flexibility. Large commercial production often favors stainless stirred tanks where consumable economics and volume demand it. Single-use currently scales to roughly a couple thousand liters, beyond which stainless typically takes over.
What materials are stainless bioreactors made from?
Stainless bioreactors use 316L stainless steel for product-contact surfaces, typically electropolished to a controlled Ra finish per ASME BPE for cleanability. Jackets may be carbon or stainless steel. Elastomer seals and gaskets are USP-Class-VI compatible. Passivation restores the passive chromium-oxide layer.
What is the difference between microbial and mammalian bioreactors?
Microbial fermentation, bacteria and yeast, demands high oxygen transfer, vigorous agitation and strong cooling for fast, robust cells. Mammalian bioreactors run gentler agitation, lower shear and tighter gas and pH control for fragile cells. Impeller design, aeration and cooling capacity differ accordingly.
Can single-use and stainless bioreactors be mixed in one facility?
Yes. Hybrid facilities commonly use single-use for seed train and flexible, multi-product steps and stainless for large-scale or high-volume production. This balances changeover speed against volume economics. Paul Industries installs and validates both within the same suite.
What determines the right impeller for a bioreactor?
Impeller choice, Rushton for gas dispersion, marine or pitched-blade for gentle axial flow, balances oxygen transfer against shear. Microbial cultures tolerate high-shear Rushton designs; fragile mammalian cells need low-shear impellers. Number, size and speed are set by the culture’s oxygen demand and shear sensitivity.
How do I choose the right bioreactor type for my process?
Selection weighs cell line, oxygen demand, shear tolerance, scale, batch frequency and product mix. Paul Industries reviews your process and installs the suited stainless or single-use system, fully piped and validated. Call 201-450-8280 to discuss your application.
What are the main types of bioreactors?
Stirred-tank, single-use/disposable, airlift, packed/fixed-bed, and wave/rocking bioreactors – each suited to different cell types and scales.
What is a stirred-tank bioreactor used for?
It is the standard bioreactor for microbial and mammalian cell culture across most manufacturing scales.
What is the difference between single-use and stainless bioreactors?
Single-use bioreactors use disposable bags for faster changeover and no CIP/SIP between batches; stainless bioreactors are cleaned and steam-sterilized in place and suit large, dedicated production.
Do you install bioreactor utilities?
Yes – WFI, clean steam, sanitary piping, and controls for the bioreactor, plus validation support.
Install or integrate a bioreactor
Paul Industries is a single-source supplier, installer, and validator – one accountable partner from design through documented startup. Tell us about your project and we will scope it.
Which bioreactor type is right for your process?
Choose on scale, product and cleaning strategy. Stirred-tank remains the default for most commercial mammalian and microbial work. Single-use removes cleaning validation and changeover time and suits multi-product and clinical-scale facilities, at the cost of consumables and extractables documentation. Airlift, wave and packed-bed systems solve specific shear or perfusion problems. Paul Industries installs, connects and supports qualification for all of them.