Filtration Equipment Selection Guide
Separation Equipment Selection Guide
From centrifuges to filter presses, from three-in-one units to disc separators — a systematic explanation of how to choose solid-liquid separation equipment.
Separation equipment overview
Solid-liquid separation is a core process step in chemicals, pharmaceuticals, food and environmental protection. The right equipment type depends on particle size, concentration, throughput and material properties.
Disc centrifuge
Manual/bag-lifting discharge
Horizontal scraper centrifuge
Fully automatic continuous
Filter Press
High-pressure filtration
Three-in-one
Washing, filtration and drying in one
Centrifuge type comparison
Disc centrifuge
| Type | Discharge method | Automation | Use cases | Selection advice |
|---|---|---|---|---|
| Plate-type closed (PSB) | Manual top discharge | PLC control | Limited space, no lifting equipment | Choose bag-lifting where possible |
| Plate-type bag-lifting | Lifting filter bag | PLC control | Same use as the closed type | First choice with lifting equipment; saves labour long term |
| Plate-type scraper bottom discharge | Automatic scraper discharge | Fully automatic | Particles >0.015 mm, concentration 25–60% | Choose by configuration grade |
Horizontal centrifuge
| Type | Model | Features | Use cases |
|---|---|---|---|
| Horizontal scraper | GK | Fully automatic continuous, short cycle | Particles >10 μm, concentration >25% |
| Horizontal siphon scraper | GKH | Siphon and backwash added to the GK design, for lower residual moisture | High output, low moisture, thorough washing |
| Sanitary horizontal scraper | GKF | Meets hygiene requirements | Pharma, food, fine chemicals |
Continuous-feed separation equipment
| Type | Separation principle | Applicable particles | Continuity | Typical applications |
|---|---|---|---|---|
| Decanter sedimentation | Sedimentation | Fine | Continuous | Sludge dewatering, juice clarification |
| Decanter filtration | Filtration | 0.05-3mm | Continuous | Downstream solid-liquid separation after MVR |
| Two-stage pusher | Filtration | Crystalline products | Continuous | Ammonium bicarbonate, ammonium chloride, urea, PVC |
| Disc separator | Sedimentation | Ultra-fine | Continuous | Mineral oil purification, dairy skimming |
| Tubular separator | Sedimentation | Ultra-fine | Batch | Low concentration, high viscosity, small density difference |
Filter press comparison
| Type | Moisture content | Features | Selection advice |
|---|---|---|---|
| Plate-and-frame filter press | Max | High loading, simple structure | When moisture requirements are moderate |
| Chamber filter press | Intermediate | Compact structure | General purpose |
| Membrane filter press | Lowest | Secondary squeezing | First choice for strict moisture requirements |
Three-in-one / two-in-one units
Two-in-one
Washing + filtration
For pharma and chemical industries
Three-in-one
Washing + filtration + drying
Multi-function and fully enclosed; for pharma, food, chemicals, pesticides, dyes, electronics and new materials
Key points when buying a three-in-one
- - Standard workshop / cleanroom grade
- - Steam heating / thermal oil heating
- - Sealing type, filter plate style
- - Liner wear, jacket pressure test
Selection checklist
Selection confirmation
- 1.Confirm particle size and concentration range
- 2.Confirm whether washing is required
- 3.Confirm filter cake moisture requirement
- 4.Confirm operation mode (batch/continuous)
- 5.Confirm materials suit the corrosivity of the product
- 6.Confirm explosion-proof requirements
Equipment condition check
- - Request a powered test-run video or an on-site trial run
- - Inspect wear of main components and operating condition
- - Confirm all documentation and conformity certificates are complete