Biotechnology process lines are the connected sequence of unit operations — substrate pretreatment, fermentation, microbial cell removal, and downstream purification — used to convert biological media into pharmaceutical and biotechnology products. Each stage demands hygienic, reliable equipment that balances gentle treatment of shear-sensitive materials with high separation performance and easy cleanability for regulated environments. This page introduces the core equipment categories and selection considerations for process engineers and procurement teams building or upgrading bioprocess lines.

Euroflow supplies Alfa Laval equipment purpose-built for the biotechnology and pharmaceutical industries. Separation solutions include fully contained, easy-to-sterilize disc stack centrifuges and the Culturefuge series, designed specifically for fragile cell culture processing with a fully hermetic, hollow-spindle design. Membrane filtration systems cover ultrafiltration and diafiltration with modular plate-and-frame units and GR membranes that enable efficient cleaning and meet FDA requirements for pharmaceutical equipment. Heat transfer solutions span gasketed plate heat exchangers, spiral heat exchangers, and hygienic shell-and-tube options such as Pharma-line for cGMP-focused duties. For fluid handling, Alfa Laval’s hygienic centrifugal pumps (including LKH UltraPure for pharmaceutical water service), SX rotary lobe pumps for low shear, and Tri-Clover UltraPure tubes and fittings support cleanability and integrity.

The sections below outline equipment types by process stage, where they fit in upstream and downstream unit operations, and how they work. Topics include gentle cell handling during harvesting, whole-broth clarification and purification with membrane filtration, heat exchanger choices for fermentation temperature control and media preparation, and the documentation and testing options (such as Q-doc and Factory Acceptance Testing) that streamline installation and qualification.

A biotechnology process line is a sequence of stages, each with distinct objectives and hygienic requirements. Selecting the right equipment starts with mapping each unit operation to its function, media characteristics, and regulatory expectations. The summary table below links major stages to core equipment types and representative Alfa Laval products used in bioprocess environments.

Substrate pretreatment sets up media quality and sterilization for the fermentation step. Sugar-based media are typically prepared with efficient gasketed plate heat exchangers. Higher-solids or fibrous feeds (for instance, hydrolysates) benefit from hygienic tubular or spiral heat exchangers that resist fouling, while clarification can be performed using disc stack centrifuges when particulate removal is required ahead of inoculation.

Fermentation temperature control relies on responsive heat transfer and hygienic media handling. Spiral heat exchangers are well-suited to viscous broths and demanding duty. For process and utility liquid handling in pharmaceutical environments, LKH UltraPure centrifugal pumps provide reliable circulation with an external shaft seal and open-impeller design that supports hygienic operation, and Unique DV-ST UltraPure diaphragm valves offer high-quality welding and materials that minimize rouge risk in sterile piping systems.

At harvest, separation technology must balance yield with gentle treatment. Fully hermetic Culturefuge separators and Alfa Laval disc centrifuges provide contained, clean-in-place-capable cell removal for bacteria, yeast, and delicate mammalian cell cultures. When solids loading is high or biomass structures are larger, decanter centrifuges provide robust solids handling. Downstream, plate-and-frame membrane filtration units support concentration, desalting, and pyrogen removal for products such as antibiotics, enzymes, and certain polysaccharides. For documentation and cleaning, Tri-Clover UltraPure tubes and fittings are certified to industry standards, and the Q-doc package delivers comprehensive traceability.

The reference table below provides another quick view from requirement to equipment choice for common process stages.

Equipment choices vary significantly by organism type, product class, and the position of a unit operation in the process line. For example, bacterial fermentations producing antibiotics call for whole-broth clarification and membrane-based concentration and desalting, while mammalian cell culture for biologics demands fully contained, gentle separation to avoid cell lysis and the release of intracellular contaminants. The table below summarizes typical industry contexts and the associated hygienic and performance requirements.

Upstream, media preparation and sterilization use gasketed plate or tubular heat exchangers, selected by viscosity and fouling tendency. During fermentation, temperature control must be responsive yet cleanable; spiral heat exchangers meet this need in viscous or solids-laden broths. Broth and utility transfers are handled by hygienic centrifugal pumps; in pharmaceutical water loops, LKH UltraPure pumps contribute to continuous circulation with an external shaft seal and open impeller that support contamination-free operation and easy maintenance.

Microbial cell removal is a pivotal downstream step. Disc stack centrifuges provide contained, high-performance separation for bacteria and yeast. For mammalian cell culture, the Culturefuge series maintains cell integrity with a fully hermetic design and low-shear acceleration, reducing the risk of lysis while adhering to high hygienic standards. When solids content is high or the biomass structure is bulky, decanter centrifuges provide continuous solids conveyance and robust handling that complements disc separation.

Further downstream, plate-and-frame membrane filtration enables recovery, purification, concentration, desalting, and pyrogen removal in applications such as antibiotics and enzymes, and helps produce polysaccharides with defined molecular sizes by selecting appropriate molecular weight cut-off membranes. GR membranes withstand a wide pH range and, together with appropriate materials, allow systems to fulfill FDA requirements for pharmaceutical equipment. When instrumentation and tank hygiene are critical — for example in water systems and holding tanks — Alfa Laval’s hygienic instrumentation and Sani SB rotary spray heads assist with monitoring and thorough wetting to maintain passive layers and minimize rouge.

Concentration and purification options

Many processes require concentration and buffer exchange after clarification. The table below outlines common methods covered by Alfa Laval’s membrane and separation portfolio.

Separation: disc stack and decanter operating principles

Disc stack centrifuges separate biomass from broth by creating a high-gravity field within a rotating bowl. A stack of conical discs divides the process liquid into thin layers, shortening settling distances so that cells and debris migrate rapidly to the periphery while clarified liquid flows inward to a central outlet. In biopharmaceutical duties, fully hermetic designs — as used in the Culturefuge series — feed and discharge through a hollow spindle to avoid an air–liquid interface, reduce shear and foam, and maintain sterile containment. The systems are fully contained, easy to sterilize, and designed for reliable clean-in-place.

Decanter centrifuges use a horizontal rotating bowl with an internal screw conveyor that operates at a differential speed to continuously move separated solids toward a discharge. Decanters cope well with higher solids loadings and fibrous materials that can overwhelm a disc bowl, making them suitable for large-biomass duties and solids-rich feeds. In many process lines, disc stack centrifuges and decanters are complementary: disc units achieve high clarification efficiency at moderate solids, and decanters take over when solids volume and particle size demand continuous conveying.

Heat exchange in media preparation and fermentation

Heat exchangers manage sterilization, pasteurization, and fermentation temperature control. Gasketed plate heat exchangers provide efficient heating and cooling for low-to-moderate viscosity media and are designed for cleanability. Where viscosity or fouling risk is higher, spiral heat exchangers offer a single-channel path that resists blockage and is compatible with hygienic duties. For applications where cGMP documentation is central, Pharma-line hygienic shell-and-tube heat exchangers are manufactured with strictly controlled and documented welding and fabrication processes, and an inspectable inner tube package is available to support visual access to product-wetted surfaces.

Pumps, valves, and tubes: maintaining hygienic integrity

Every transfer step is a hygiene-critical point. In pharmaceutical water loops and hygienic utilities, LKH UltraPure centrifugal pumps support continuous circulation and help prevent biofilm buildup through an external shaft seal, easy leak detection, and an open-impeller design that promotes hygienic flow. For low-shear product handling, Alfa Laval SX rotary lobe pumps are designed for gentle treatment.

On/off control in sterile service is handled by diaphragm valves. Alfa Laval Unique DV-ST UltraPure valves are offered in high-grade stainless steel with specified sulphur and low delta-ferrite content to secure easy, high-quality welding and minimize the risk of rouge. Forged versions reduce material use and weight, lowering energy input for heating and reducing piping stress. Tri-Clover UltraPure tubes and fittings, certified to ISO 2037 and ASME BPE with 100% incoming and outgoing inspection, help ensure secure, self-aligning joints and crevice-free, corrosion-resistant interiors for hygienic systems that are simple to clean and maintain.

Membrane filtration: concentration and purification

Plate-and-frame membrane systems enable concentration, desalting, and purification of products produced by bulk fermentation, extraction, or hydrolysis — including antibiotics, enzymes, and certain polysaccharides such as hydroxyethyl starch (HES). Selecting the appropriate molecular weight cut-off allows retention of target molecules while permeating smaller solutes. Diafiltration, achieved by continuous water addition to the feed, further increases purity. Alfa Laval GR membranes withstand a broad pH range aligned with industry cleaning practices, and with appropriate materials allow systems to fulfill FDA requirements for pharmaceutical equipment.

Cleanability, documentation, and validation support

Hygienic design features — such as crevice-free internals, fully drainable geometries, and external shaft seals on centrifugal pumps — shorten cleaning cycles and reduce contamination risk. Alfa Laval separators and heat exchangers are engineered for reliable clean-in-place, and the fully contained separator designs simplify sterilization and cleaning. For tank hygiene, Toftejorg dynamic tank cleaning devices use high-impact, rotating jet heads to efficiently remove residues and reduce the need for cleaning chemicals and rinse water.

Documentation and testing accelerate qualification. The Alfa Laval Q-doc package brings together material certificates, test certificates and reports, manufacturing procedures, and quality procedures for equipment and spare parts, meeting the growing demand for traceability in accordance with legislation and industry standards. Factory Acceptance Testing (FAT) at Alfa Laval’s facility in Tumba, Sweden allows customers to verify hydraulic capacity, start and stop functions, discharge operation, nozzle locations, pipe slopes, surface finishes, electrical wiring, and required documentation before shipment. Many organizations then conduct a Site Acceptance Test (SAT) and leverage FAT outputs during Installation Qualification and Operational Qualification steps to reduce time to validated operation.

Selecting between disc stack and decanter centrifuges

Choice depends on organism size and structure, solids content, and whether the target product is in the liquid phase or associated with the biomass. Disc stack centrifuges suit bacteria and yeast where clarification at high efficiency and gentle handling (in hermetic configurations) is required. Decanters are favored when solids volume is high or particles are large and robust continuous discharge is needed. When fragile mammalian cells are present, hermetic Culturefuge designs provide gentle acceleration and fully contained operation to protect product integrity.