Ultrafiltration Desalination Equipment for Seawater & Brackish Water Pretreatment

Ultrafiltration Desalination Equipment for Seawater & Brackish Water Pretreatment

Ultrafiltration desalination equipment serves as the core pretreatment membrane facility for seawater and brackish water desalination projects, effectively stabilizing feed water quality before reverse osmosis units. It can be professionally customized by reliable Ultrafiltration equipment manufacturer, and matched with Ultrafiltration water purification equipment to build integrated multi-stage desalination workflows. Operating under low-pressure cross-flow separation technology, this equipment intercepts suspended solids, colloids, marine organisms, algae and macromolecular organics, lowering SDI value and mitigating fouling risks of downstream RO membranes. Featuring automatic operation, strong anti-pollution performance and modular expandability, ultrafiltration desalination equipment has become the preferred pretreatment solution for coastal desalination plants, island water supply and industrial brackish water treatment worldwide.

Product Description

Ultrafiltration desalination equipment refers to dedicated membrane filtration systems designed for saline raw water including seawater and brackish water. Different from general water purification ultrafiltration units, this equipment adopts seawater-resistant membrane materials and anti-corrosion pipeline configurations to adapt to high-salinity raw water environments. The complete assembly consists of raw water lift pump, self-cleaning filter, ultrafiltration membrane rack, centralized backwashing unit, chemical cleaning dosing system and PLC intelligent control cabinet.

In small and medium-scale desalination projects, customers can select standard Ultrafiltration water purification equipment after targeted anti-corrosion upgrading. For large coastal desalination stations, global buyers can cooperate with professional Ultrafiltration equipment manufacturer to complete non-standard design, parallel modular layout and process optimization. The mainstream configuration adopts salt-resistant PVDF hollow fiber ultrafiltration membranes; tubular membrane modules are optional for raw water with high suspended solids and frequent algal bloom. Ultrafiltration desalination equipment is mainly applied before seawater reverse osmosis (SWRO) and brackish water reverse osmosis (BWRO) systems. It efficiently eliminates particulate pollutants that easily cause RO membrane fouling, ensuring long-term stable operation of desalination production lines for municipal water supply, island engineering, marine industrial parks and coastal factories.

Working Principle

Ultrafiltration desalination equipment relies on low-pressure cross-flow membrane sieving principle suitable for saline water treatment. Driven by circulating pumps under stable operating pressure of 0.1–0.3 MPa, seawater or brackish water flows evenly through ultrafiltration membrane elements. Water molecules and soluble salt ions pass through membrane micropores to form qualified permeate water supplied to subsequent reverse osmosis systems. Suspended sediment, colloids, plankton, bacteria, algae and macromolecular organic pollutants are intercepted on the membrane surface and continuously discharged with concentrated water.

Continuous cross-flow produces persistent shear force on the membrane surface to reduce pollutant accumulation and relieve biofouling risk caused by marine microorganisms. The automatic control system implements timed backwashing; when membrane flux declines after long-term operation, online chemical cleaning restores membrane permeability. According to project scale and water quality characteristics, users can deploy modified Ultrafiltration water purification equipment for small desalination projects, or obtain large-capacity customized solutions from experienced Ultrafiltration equipment manufacturer. Reasonable pretreatment configuration can significantly extend membrane service life and reduce overall operation cost of the whole desalination system.

Technical Features

• 1. Saline water targeted design:

• Adopt anti-corrosion frame and pipeline materials, and salt-resistant ultrafiltration membranes to adapt seawater and brackish water working conditions.

• 2. Stable low SDI effluent:

• Effectively remove colloids and microorganisms, continuously maintain low SDI feed water to protect reverse osmosis membranes.

• 3. Modular parallel layout:

• Support multi-group membrane rack parallel operation, convenient for staged capacity expansion of large desalination plants.

• 4. Full automatic intelligent control:

• Realize automatic backwashing, chemical cleaning and pressure abnormal alarm for unattended continuous operation.

• 5. Diversified configuration schemes:

• Standard upgraded Ultrafiltration water purification equipment and customized engineering solutions supplied by professional Ultrafiltration equipment manufacturer.

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• Product Advantages

• 1. Superior anti-fouling performance:

• Optimized cross-flow parameters reduce organic and biological pollution, lower RO cleaning frequency.

• 2. Low energy consumption:

• Operate under low transmembrane pressure, greatly cutting power consumption compared with high-pressure membrane separation equipment.

• 3. Strong raw water adaptability:

• Stable filtration performance even when facing seasonal turbidity fluctuation and coastal algal bloom.

• 4. Compact skid-mounted structure:

• Save construction land of coastal desalination plants and shorten on-site installation and commissioning cycle.

• 5. Flexible engineering matching:

• Perfectly connected with SWRO/BWRO desalination systems to form mature integrated membrane desalination process.

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• Application Fields

• Coastal large-scale seawater desalination plant pretreatment for municipal domestic water supply.

• Island brackish water and seawater desalination projects for resident living and tourism industry water demand.

• Marine industrial park brackish water treatment and circulating water make-up water preparation.

• Small and medium desalination projects adopting anti-corrosion upgraded Ultrafiltration water purification equipment.

• Large-capacity desalination pretreatment stations customized by professional Ultrafiltration equipment manufacturer.

• Offshore platform, port and coastal factory saline raw water advanced purification projects.

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• FAQ

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