Dairy Filtration Application Guide

Dairy Processing Conditions & Solutions

Raw Milk · Cheese · Whey · Yogurt · Cream · Powdered Milk

This guide covers raw milk reception, bioburden reduction, casein and whey protein fractionation, cheese brine, whey, yogurt, ice cream base, powdered milk ingredients, utilities, and filtration and membrane separation selection for CIP boundaries.

Food, Beverages, Wine, and Spirits Filtration ↗

01 — 06

Typical Dairy Filtration and Membrane Separation Routes

01Raw Milk or Dairy Product Material

02Sizing and Fat Separation

03Clarification and Protective Filtration

04Microfiltration or Depth Filtration

05UF/NF/RO for Targeted Separation

06Sanitary Filling and Quality Release

Engineering route diagram. The separation scale and equipment combination depend on the target component, fat and protein state, temperature, microbial target, cleaning recovery rate, and quality balance.

Pleated Filter Cartridges for Cheese, Brine, and Whey Processing

Sweet Whey: Curd Powder and Fat Load Material | Sweet Whey after Cutting/Whey Drainage

Cheese Brine: Turbidity and Microbial Build-Up Material | Circulating Brine

Brine Filtration Still Quickly Fouling Membrane Material | High Calcium, High Protein Brine

UF Cheese: Viscosity Increase, Change in Whey Drainage Material | UF Concentrated Cheese Whey

Acid Whey: NF/RO Scaling Material | Greek Yogurt or Acid Curd Wastewater

Acid Milk, Condensed Milk, Ice Cream, Milk Powder, and Additives

Greek Yogurt: Whey Separation, Protein Insufficiency Material | Milk Base before Fermentation

Condensed Milk / Ice Cream Base: Agglomerate Blockage of Heat Exchanger Material | Syrup, Stabilizers, Cocoa/Flavor Dispersions

Low Solids Liquid Additives: Final Microbial Load Material | Salt, Acid, Enzymes, Flavor or Vitamin Solutions

Milk Powder Pre-Stage: Concentrate Protection Material | Milk Liquid / Whey before Evaporation

Milk Powder Drying/Cooling: Air Re-Contamination Material | Spray Drying, Fluidized Bed, Packaging Area

Lactose/Mineral Concentrate: Conflict Between NF Flux and Purity Material | UF Permeate / Acid Whey

Utility Engineering, Aseptic Boundary, and CIP

Process Water: Final Microbial Fluctuation Material | Mixing Water, Rinse Water, Final Rinsing Water

Product Contact Compressed Air / Nitrogen Material | Filling, Purging, Tank Pressurization

Aseptic Tank Venting: Pressure Drop and Back Suction Material | Aseptic Buffer Tank, Fermentation Tank, Filling Tank

Membrane Flux Does Not Recover Post-CIP Material | MF/UF/NF/RO Systems

Microbiological Positive After Filtration Material | Liquid or Gas Final Filter

Fault Diagnosis and Acceptance

Differential Pressure / Flux Diagnostics

Observation	Primary Considerations	Confirmations Required	Improvement Directions
High Differential Pressure Upon Startup	Pore Size Too Small, Low Temperature, High Viscosity, Insufficient Area	Actual Temperature/Flow; Filter Orientation; Valve Position	Increase Area, Raise to Allowable Temperature, Add Coarse Filtration
Initial Rapid Clogging in First Few Minutes	Clots, fat globules, protein aggregates, or pre-filtering not performed	Residues, particle size, fat/protein, pre-filter differential pressure	Separate/clear first; use depth or crossflow
Differential pressure normal but downstream turbid	Bypass, seal or nominal accuracy mismatched	End cap, O-ring, housing bypass, β-value/absolute grade	Calibration port; switch to verifiable grade
No flow recovery post-CIP	Irreversible protein/mineral composite pollution	Acid/base sequence, temperature, concentration, circulation flow rate	Step cleaning; reduce concentration/temperature shock
0.2 μm Air filter airflow drop	Condensate moisture wets hydrophobic membrane or upstream oil presence	Drain, dew point, compressed oil, installation slope	Enhance water and oil removal; replace and perform integrity testing
Intermittent microbial positivity	Sample, downstream or installation integrity issue	Culture method, bypass, seal, terminal tubing, integrity testing	Isolate batch; system investigation, not just replace with smaller pore size

Recommended process package

Scenario	Recommended Process Flow	Filter Cartridge/Capsule	Validation Focus
Small Cheese Factory Brine	50–100 μm Filtration → 10–20 μm PP → 1–5 μm PP → 0.2 μm PES Capsule (Low Load) or 0.1–0.2 μm Circulating Microfiltration	PP Pleated, PES Capsule, Necessary Gas Breathing Capsule	Batch, Turbidity, Colony Count, Salinity, pH, Pressure Differential
Whey Protein Line	100–300 μm → 20–50 μm → 1–5 μm → 0.1 μm Microfiltration → 5–30 kDa Ultrafiltration/Dialysis → Nanofiltration/RO → Powdering	Screen/bag/PP pleated; water/gas final filter cartridge	Fats/curd powder, calcium phosphate, flux recovery, quality balance
Milk powder/formulation powder	Raw material screening/settling → thermal treatment → evaporation → spray drying → cooling → screening → packaging; independent validation of air system	initial coarse fine filtration, liquid additives in capsule filter, tank venting	Downstream air, condensate, dust, wet/dry area segregation and environmental monitoring