Biopharmaceuticals

Introduction

Biopharmaceutical manufacturing uses process liquids with different particle characteristics, solids concentrations, cleanliness requirements, and operating conditions. Filtration supports media and buffer preparation, cell harvest clarification, intermediate processing, water treatment, and facility utilities. Fengnuochang provides stainless steel filtration equipment and customized configurations for liquid clarification, particulate removal, and equipment protection in biopharmaceutical and biotechnology applications. Materials, filtration area, filter media, micron rating, connections, operating pressure, and surface treatment can be selected to suit the process liquid and production requirements.

FILTRATION EQUIPMENT FOR BIOPHARMACEUTICAL PROCESSING

Biopharmaceutical filtration should not be selected according to micron rating alone. Cell‑containing liquids, clarified intermediates, buffers, process water, and utility water can have very different filtration characteristics.
Select equipment according to the process stage, particle characteristics, solids loading, required filtration level, material compatibility, and downstream operation.

Cartridge Filters

Cartridge filter housings provide a flexible configuration for fine particulate filtration of compatible process liquids and water‑treatment applications.
Different cartridge quantities, lengths, filtration media, and micron ratings can be configured according to required flow capacity, particle characteristics, and filtration requirements.
They can also be positioned downstream of primary clarification equipment to reduce residual fine particles and provide additional protection for subsequent processing stages.
Stacked Filters

Stacked filters offer a compact configuration with filtration area selected to suit clarification requirements.
They can be used for clarification and polishing of selected biological and pharmaceutical process liquids, with different filter media selected according to particle characteristics, solids loading, and required clarification level.
Candle Filters

Candle filters support enclosed clarification and solid‑liquid separation of compatible process liquids containing suspended particles.
Candle filter configurations provide a relatively large effective filtration area and can be selected for certain intermediate clarification applications where repeated filtration cycles are required.
Bag Filters

Bag filters provide economical prefiltration for compatible process liquids containing larger suspended particles.
Bag filters can be installed upstream of finer filtration equipment to remove larger suspended contaminants, helping reduce the solids load reaching subsequent cartridge or membrane filtration stages.
Magnetic Filters for Ferrous Contaminant Control

Magnetic filters provide an additional contamination‑control stage where ferrous particles from tanks, mixers, pumps, pipelines, or upstream equipment are a concern.
They are more suitable for raw‑material and compatible process‑liquid protection than for final purified‑product filtration.

FILTRATION THROUGHOUT BIOPHARMACEUTICAL PROCESSING

Different stages of biopharmaceutical production require different approaches to particulate control. A staged filtration strategy can help distribute the solids load and protect finer downstream filtration equipment.

01 — Media & Buffer Preparation

Pre‑Filtration & Particle Control：Bag Filters + Cartridge Filters
Media and process buffers may require particulate filtration before entering subsequent processing stages.
Bag filters can remove larger suspended contaminants, while cartridge filters can provide finer particle control according to the characteristics of the process liquid and downstream requirements.
02 — Cell Harvest & Primary Clarification

After cell culture or biological production, harvested liquids may contain whole cells, cell debris, colloids, and other suspended solids.
This stage can have a considerably higher solids load than later downstream processing stages.
Primary Solids Reduction：Stacked Filters + Candle Filters
Suitable configurations can provide solid‑liquid separation and reduce particulate loading before finer downstream processing.
Equipment and filter media should be selected according to solids concentration, particle characteristics, filtration area, and required clarification level.
Secondary Clarification：Bag Filters + Cartridge Filters
Additional filtration can be applied after primary solids reduction where further particulate control is required before subsequent processing.
03 — Intermediate Process Filtration

After primary clarification, process liquids may still contain fine particles, precipitates, aggregates, or other suspended contaminants.
Bag Filters：Suitable where intermediate process liquids still contain a relatively significant particulate load.
Stacked Filters：Provide additional clarification and polishing using selected filtration media.
Cartridge Filters：Provide finer particulate control before more sensitive downstream processes.
A staged arrangement can help prevent finer filter elements from receiving the entire solids load directly.
Typical Process Concept
Clarified Process Liquid
↓
Intermediate Clarification
Stacked Filter / Bag Filter
↓
Fine Particle Control
Cartridge Filter
↓
Downstream Processing
The actual filtration sequence should be determined according to the biological product, process liquid, solids loading, particle characteristics, and downstream process requirements.
04 — Fine Process Filtration & Downstream Protection

As particulate loading decreases after upstream clarification, cartridge filtration can be used for finer particle control of compatible process liquids.
Cartridge Filter Housings
Cartridge filter housings provide the pressure vessel and fluid path for compatible filter elements selected according to the customer's process requirements.
Filter element type, filtration rating, housing material, sealing configuration, connection design, and operating conditions should be selected according to the actual process application.
A suitable housing and filter‑element combination provides particle control before subsequent separation, purification, or transfer.

WATER TREATMENT & PROCESS WATER SUPPORT

Water is widely used in biopharmaceutical facilities for process preparation, cleaning, equipment operation, and supporting utilities. Filtration equipment can be configured at different stages of a supporting water‑treatment system.

Raw Water Pretreatment

Multi‑Media Filters + Self‑Cleaning Filters
Reduce sediment, suspended solids, and turbidity before downstream water‑treatment equipment.
Membrane Protection

Bag Filters + Cartridge Filters
Provide finer particulate control before UF and RO membrane‑treatment stages.
Membrane Treatment

UF + RO Systems
UF and RO systems can form part of a staged water‑treatment process, with each stage selected for the contaminants it is intended to remove.

Typical Water Treatment Concept
Raw Water
↓
Multi‑Media / Self‑Cleaning Filtration
↓
Bag / Cartridge Filtration
↓
UF / RO
↓
Further Treatment
↓
Required Process Water
Final water quality and the complete treatment configuration must meet the intended application and applicable process requirements.

FACILITY & UTILITY FILTRATION

Biopharmaceutical facilities also require filtration for supporting water systems.
Raw water, cooling water, circulating water, and other supporting utility systems can involve much larger flow rates and higher suspended‑solids loads. These applications are particularly suitable for automatic filtration and backwash technologies.

Brush Self‑Cleaning Filters

Provide automatic removal of suspended solids from suitable utility‑water systems, helping reduce frequent manual screen cleaning.
Suction Self‑Cleaning Filters

Suitable for automatic screen filtration of selected circulating‑water and cooling‑water applications.
Disc Backwash Filters

Suitable for automatic filtration and repeated backwashing in larger supporting water‑treatment systems.
Multi‑Media Backwash Filters

Provide filtration for sediment and suspended‑solids reduction before downstream water‑treatment stages.

Process and Utility Filtration
Process Liquid Filtration — Cartridge / Stacked / Candle / Bag Filters
Facility & Utility Filtration — Self‑Cleaning / Backwash / Multi‑Media / Disc Filters
Select equipment according to the liquid being treated, its particulate load, and the requirements of the process or utility system.

PHARMACEUTICAL WASTEWATER & WATER REUSE

Biopharmaceutical facilities may generate process wastewater, cleaning wastewater, and other liquid streams with very different compositions.
Filtration can provide suspended‑solids reduction, particulate control, and downstream equipment protection as part of a broader wastewater‑treatment or water‑reuse process.

Higher Solids Loads

Self‑Cleaning Filters + Candle Backwash Filters
Suitable for selected wastewater streams containing relatively higher suspended‑solid loads.
Suspended Solids & Turbidity Reduction

Multi‑Media Backwash Filters
Can provide pretreatment before subsequent wastewater‑treatment stages.
Intermediate Particle Removal

Bag Filters
Provide flexible removal of suspended particulate contaminants.
Membrane Pretreatment

Cartridge Filters
Provide finer particulate control before downstream membrane systems.
Water Reuse Treatment

UF + RO Systems
Can form part of a multi‑stage water‑reuse treatment configuration.

The actual treatment process should always be based on wastewater analysis and the required treated‑water quality. Filtration alone does not remove all dissolved pharmaceutical, chemical, or biological contaminants.

DESIGNED AROUND BIOPHARMACEUTICAL PROCESS REQUIREMENTS

Different Filtration Approaches for Different Solids Loads

High‑solids harvest streams and relatively clarified downstream liquids require different filtration strategies.
A staged filtration arrangement distributes particulate loading across equipment suited to each process stage.
Large Filtration Area for Clarification

Stacked and candle filters offer configurable filtration areas for clarification applications. Capacity depends on the process liquid, filter medium, and solids loading.
Flexible Cartridge Configurations

Cartridge quantity, length, filtration media, micron rating, housing size, and connection configuration can be selected according to process requirements and flow capacity.
Material & Surface Requirements

SS304 and SS316L configurations are available.
Equipment material, surface treatment, seals, filter elements, and connection designs should be selected according to fluid compatibility, cleaning requirements, and customer specifications.
Supporting Utility Filtration

Automatic self‑cleaning and backwash technologies provide separate filtration solutions for raw water, cooling water, circulating water, and wastewater, where continuous operation and reduced manual cleaning are priorities.
Customized Filtration Engineering

Filtration area, vessel capacity, filter‑element quantity, materials, connections, operating pressure, micron rating, and system arrangement can be configured for the production process.

DEFINE YOUR PROCESS BEFORE SELECTING FILTRATION EQUIPMENT

Equipment selection starts with the process liquid and its solids characteristics.
A cell‑harvest stream with a high biomass concentration requires a different filtration approach from a clarified liquid needing fine particulate control.

For more accurate equipment selection, please provide:

Application / Process Stage — Media / Buffer / Cell Harvest / Clarification / Process Liquid / Water / Utility / Wastewater
Process Medium
Main Particles / Solids Condition
Required Flow Rate
Required Filtration Accuracy
Operating Temperature & Pressure
Material & Connection Requirements
Upstream & Downstream Process
Cleaning or Special Process Requirements
If applicable, please also provide your required process standard or customer specification.

Based on these conditions, Fengnuochang can recommend equipment, filtration area, filter media, materials, connections, and a system arrangement for your application.

SEND YOUR BIOPHARMACEUTICAL FILTRATION REQUIREMENTS TO OUR ENGINEERS

Send us your process medium, flow rate, target micron rating, solids condition, pressure, temperature, and application requirements. If some details are unavailable, describe your liquid and filtration problem so our engineers can help identify the information needed for equipment selection.