Spiral‑wound Ultrafiltration Equipment
Spiral‑wound Ultrafiltration Equipment
Working principle of spiral‑wound ultrafiltration equipment
The core part is spiral‑wound UF membrane element, which is tightly rolled precision filter sheets.
Under feed pressure, raw water flows along the membrane surface. Part of water passes through tiny membrane pores to become purified permeate. Substances such as colloids, suspended solids, macromolecules and bacteria are too large to go through the membrane and get trapped on membrane surface. Most feed water flows tangentially across membrane, carrying trapped contaminants out as concentrate, to reduce membrane fouling.
UF can remove particles, bacteria and organics, but cannot remove dissolved salts.
Advantage:
1. High mechanical strength, no fiber breakage risk.
2. Excellent chemical resistance, easy for CIP & CEB cleaning.
3. Compact membrane module structure, high packing density.
4. Stable filtration performance, consistent permeate quality.
5. Low pressure operation, relatively low energy consumption.
6. Wide adaptability for multiple applications: RO pretreatment, wastewater reuse, process water.
7. Easy maintenance and simple system skid integration.
Scope of Supply
| Membrane module assembly | - Spiral-wound UF membrane elements - Pressure vessels /membrane housings - Membrane brackets & connecting fittings |
|---|---|
| Pumps | - Raw water feed pump - Backwash pump - CEB chemical dosing pump CEB - CIP circulation pump |
| Pre-filtration system | -Security filter /bag filter - Filter cartridges /filter bags |
| Chemical dosing system | - Chemical dosing tanks(CEB) - Dosing pumps, valves, agitators |
| Piping, valves & instruments | -Wetted piping (PVC / SS304 / SS316L) - Manual & pneumatic control valves - Pressure gauges, pressure transmitters, flow meters, online turbidity meter -Conductivity meter |
| Control & electrical system | - Control cabinet, PLC & HMI 、PLC- Sensors, alarm & interlock logic - Cable, cable tray and wiring |
| Skid frame | - Carbon steel /stainless steel skid with anti-corrosion coating |
| Accessories & spare parts | - Gaskets, O-rings, spare filter bags/cartridges -Operation & maintenance manual, P&ID drawing, wiring diagram - CE certificate, material certificates(upon request) |
| **Exclusions** | Civil work, external tanks, site piping outside skid, - Power cable from main power to control cabinet |
Application Fields
Pretreatment ahead of RO system, remove colloids, suspended solids and macromolecular organics, reduce SDI value and protect RO membranes.
Advanced treatment for chemical, printing & dyeing, electroplating wastewater for process water recycling
Treat river, lake and well water to remove suspended solids, colloids and bacteria for process water supply
Clarification filtration for fruit juice, tea beverage and syrup; remove bacteria and macromolecular impurities while retaining target components
Lower feed SDI and ensure stable operation of reverse osmosis system
Feed liquid clarification, macromolecule separation and fermentation broth filtration.
Advanced treatment of municipal reclaimed water for irrigation and general industrial usage.
Frequently Asked Questions
What is spiral-wound UF, and how is it different from hollow fiber UF?
Spiral-wound UF membrane is made by wrapping flat sheet membrane around a central permeate tube. Hollow fiber uses capillary fiber bundles. Spiral-wound UF features better mechanical strength, resistant to fiber breakage, easier for CIP chemical cleaning; but it is more sensitive to large particles and oil, so pre-filtration is essential.
What is the typical pore size of spiral-wound UF membrane?
Normally 0.01~0.1 μm. It can retain colloids, bacteria, viruses and macromolecular organics, but cannot remove dissolved salts and ions.
What raw water is suitable for spiral-wound UF?
Raw water turbidity <50 NTU. Raw water with high oil, large suspended solids or heavy algae needs pre-treatment (bag filter, self-cleaning filter etc.) to avoid membrane channel blockage
What are the cleaning modes for spiral-wound UF?
① Backwash ② CEB (Chemical Enhanced Backwash) ③ CIP (Clean-in-Place). CIP uses sodium hypochlorite, citric acid for organic, microbial and inorganic fouling removal.
What is the service life of spiral-wound UF membrane?
3–5 years under proper operation, backwash & chemical cleaning. Poor raw water or insufficient cleaning will shorten membrane life.
Can spiral-wound UF skid run automatically?
Yes. Standard skid supports auto run, backwash, CEB, alarm and interlock. Manual work is only for periodic inspection and CIP maintenance.
What is the operating pressure range?
Low pressure operation, generally 0.1–0.3 MPa.
What are the common fouling types?
Particulate fouling, organic fouling, microbial fouling, inorganic scaling. Regular backwash and chemical cleaning control fouling.
Spiral-wound Ultrafiltration Equipment Enquiry
- Flow rate — -Raw water inflow capacity(m³/h) -Permeate water production capacity(m³/h) -Required water recovery rate (%)
- Raw water quality — -Raw water source: river /lake/groundwater /municipal effluent /industrial wastewater -Turbidity (NTU), TSS -COD, TOC -Oil & grease content -pH value range -Algae content, iron/manganese concentration
- Permeate requirement — -Permeate water quality standard -Intended use: RO pretreatment /drinking water /wastewater reuse /factory process water
- Operating condition requirements — -Operating temperature range -Power supply standard (380V/415V, 50Hz/60Hz) -Automatic /manual control preference
- Membrane & equipment requirements — -Membrane material preference (PVDF, PES) -Cleaning scheme requirement: backwash, CEB, CIP -Material of wetted parts (PVC / FRP / SS304 / SS316L
- Commercial & after-sales terms — -Delivery term: FOB / CIF / CFR -Destination port -Required lead time -Document requirement (manual, CE certificate etc.)
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