Filtration Equipment

Membrane Filtration (MF / UF / NF / RO) System

Membrane filtration is a pressure-driven separation technology that passes a liquid across a semi-permeable membrane, retaining species larger than the membrane's cut-off while allowing smaller molecules and solvent to permeate. The spectrum runs from microfiltration (MF) through ultrafiltration (UF) and nanofiltration (NF) to reverse osmosis (RO), each removing progressively smaller species. In an extraction or process line these systems clarify crude extract, concentrate valuable actives, desalt, and purify without heat or phase change, protecting heat-sensitive compounds. Mechotech designs and manufactures turnkey membrane filtration systems, supplying complete engineered skids for pharmaceutical, nutraceutical, food and botanical extraction industries.

Membrane filtration works by applying pressure to drive feed across a semi-permeable membrane, splitting it into a permeate that passes through and a retentate that is held back, most commonly in a cross-flow arrangement that continuously sweeps the surface to limit fouling. MF separates suspended solids and microbes, UF retains macromolecules and colloids, NF rejects multivalent ions and small organics, and RO removes nearly all dissolved species down to monovalent salts. This delivers clarity, high product purity, strong recovery, and concentration of actives at ambient or mild temperature. Wetted components are built in SS 304 or SS 316L with sanitary membrane elements and hygienic, GMP-oriented design, PLC-based automation, and membrane area and capacity configured to the client's requirement.

Technical Specifications

Technology	Pressure-driven membrane separation (MF / UF / NF / RO)
Working Principle	Feed driven across a semi-permeable membrane splits into permeate and retentate by size and charge selectivity
Separation Range	MF retains suspended solids and microbes; UF retains macromolecules and colloids; NF rejects multivalent ions and small organics; RO removes nearly all dissolved species
Flow Configuration	Cross-flow (tangential) with recirculation and diafiltration options
Membrane Elements	Spiral-wound, hollow-fibre, tubular or ceramic (application-selected)
Product-contact Material	SS 304 / SS 316L with sanitary membrane element types
Automation	PLC/SCADA (configurable)
Capacity	Configured to requirement
Utilities	Electrical power, feed pumping, CIP and rinse water as applicable
Compliance	GMP hygienic design
Output	Clarified, concentrated, desalted or purified permeate and retentate streams

Manufacturing Process

Feed Pretreatment

The incoming stream is pre-filtered and conditioned to remove coarse solids and protect the membrane elements from premature fouling.

Pressurised Feed Delivery

A feed pump raises the stream to the trans-membrane pressure appropriate to the selected MF, UF, NF or RO stage.

Cross-Flow Membrane Separation

Feed flows tangentially across the membrane so permeate passes through while retained species are swept along, minimising surface build-up.

Permeate Collection

The clarified, purified or desalted permeate is collected for downstream use or further membrane polishing.

Retentate Concentration or Recirculation

The retentate carrying concentrated actives or rejected species is recirculated to raise concentration or diafiltered to wash out unwanted solutes.

Diafiltration and Desalting

Fresh water or buffer is added to the retentate loop to displace salts and small molecules, refining purity of the target product.

Membrane Cleaning

CIP cycles restore permeate flux by removing accumulated foulants between production runs.

Applications

Clarification of crude botanical and herbal extracts (MF/UF)
Concentration of high-value actives without thermal load (UF/NF/RO)
Desalting and buffer exchange by diafiltration (UF/NF)
Purification and fractionation of macromolecules by molecular size (UF)
Decolorization and removal of small coloured impurities (NF)
Recovery and dewatering of extract streams (RO)
Sterile-grade clarification and microbial reduction (MF)
Water purification and process water polishing (RO)

Key Features

Full MF-UF-NF-RO Spectrum
Systems are configured across the pressure-driven membrane range so the correct cut-off is applied for clarification, concentration, desalting or purification.
Cross-Flow Fouling Control
Tangential flow continuously sweeps the membrane surface, sustaining permeate flux and extending element life on difficult feeds.
Gentle Ambient Separation
Separation by pressure rather than heat protects thermolabile actives, aromas and proteins from degradation.
Hygienic GMP Construction
Sanitary SS 304 or SS 316L wetted parts with food- and pharma-grade membrane elements support CIP and GMP-oriented operation.
Automated Skid Control
PLC-based automation regulates pressure, flow, diafiltration and cleaning for repeatable, operator-independent performance.

Frequently Asked Questions

What is membrane filtration (MF / UF / NF / RO)?

Membrane filtration is a pressure-driven separation technology in which a liquid is passed across a semi-permeable membrane that retains species larger than its cut-off and lets smaller molecules and solvent permeate. MF, UF, NF and RO form a spectrum that removes progressively smaller species, from suspended solids down to dissolved salts.

How does membrane filtration work?

Pressure drives the feed across the membrane, usually in cross-flow, splitting it into a permeate that passes through and a retentate held back. Microfiltration removes solids and microbes, ultrafiltration retains macromolecules, nanofiltration rejects multivalent ions and small organics, and reverse osmosis removes nearly all dissolved species.

Where does membrane filtration fit in an extraction or purification line?

It typically follows extraction or clarification, where MF and UF clarify and fractionate crude extract, UF and NF concentrate and desalt actives, and RO recovers and dewaters streams, all without heat, protecting heat-sensitive compounds before drying or formulation.

What are the key benefits of membrane filtration?

It delivers clarity, high purity, strong recovery, and concentration of actives at ambient or mild temperature, enabling desalting and fractionation in a continuous, energy-efficient process that avoids the thermal load of evaporation.

What capacity of membrane system can Mechotech supply?

Membrane area, staging and capacity are configured to the client's feed characteristics and throughput rather than a fixed model, and Mechotech recommends pilot trials to confirm flux, rejection and cleaning parameters before scaling.

What materials and compliance standards apply?

Wetted parts are built in SS 304 or SS 316L with sanitary, food- and pharma-grade membrane elements and hygienic, GMP-oriented design with CIP capability suitable for pharmaceutical, nutraceutical and food processing.

Does Mechotech supply the membrane filtration plant as a turnkey system?

Yes. Mechotech designs, fabricates, installs and commissions the complete membrane filtration skid as a single accountable turnkey scope, integrated with the surrounding extraction or process line.

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Membrane Filtration (MF / UF / NF / RO) System