High Efficiency Industrial Ultrafiltration Equipment for Water Treatment

1. Product Introduction of Ultrafiltration Equipment

Ultrafiltration equipment relies on polymer ultrafiltration membrane as the core filter medium, forming a complete automatic water treatment system matched with pipeline assembly, booster pumps, backwash system, chemical cleaning unit and PLC intelligent control cabinet. Different from traditional quartz sand filtration and bag filtration, ultrafiltration realizes physical interception at the molecular level, with stable effluent quality and strong anti-interference ability against fluctuating raw water quality.

LEFILIER develops graded ultrafiltration equipment aiming at different water quality pollution levels and project layout modes. For factory reconstruction projects with limited installation space, customers can choose compact frame-type Industrial Skid Mounted Ultrafiltration Equipment. All pipelines, meters and control components are fixed on an integral steel skid, requiring only water pipe and power connection on site to finish commissioning, greatly shortening project construction cycles. For printing and dyeing wastewater, landfill leachate and other heavily polluted wastewater treatment projects, wide-flow-channel Tubular Ultrafiltration Membrane effectively avoids pollutant accumulation inside the membrane cavity, showing excellent anti-fouling performance under long-term high-load operation. For small food factories, commercial water stations and laboratory water supply, the fully assembled Integrated Ultrafiltration Water Purification Equipment integrates all functional modules inside one cabinet, realizing automatic backwashing and online chemical cleaning without extra auxiliary facilities. For large-scale municipal reclaimed water plants and central pure water stations in chemical parks, the whole set of pre-tested Complete Ultrafiltration Integrated Equipment supports parallel operation of multiple membrane groups to cope with large-volume continuous water production demands.

The mainstream membrane material of our ultrafiltration equipment is modified PVDF hollow fiber, featuring outstanding oxidation resistance, acid and alkali resistance, and mechanical tensile strength. The supporting frame adopts standard 304 stainless steel, and 316L stainless steel material is optional for corrosive wastewater environments. The built-in PLC control system supports pressure difference automatic alarm, timed backwash and regular cleaning reminders, realizing 24-hour unattended automatic operation. At present, ultrafiltration equipment has become the essential core unit in reclaimed water reuse, pure water pretreatment and sewage advanced treatment processes.

2. Working Principle of Ultrafiltration Equipment

Ultrafiltration equipment adopts pressure-driven cross-flow filtration working mode, which is divided into two core states: normal water production filtration and pollutant cleaning regeneration.

Filtration State (Water Production)

Raw water is pressurized by the feed pump to 1.0–3.5 bar and enters the ultrafiltration membrane module. The ultrafiltration membrane has uniform micropores with a pore size of 0.01~0.1μm. Water molecules and small soluble inorganic salts smoothly pass through the membrane wall to form qualified produced water for subsequent use. Suspended particles, colloids, bacteria, algae, macromolecular organic matter and microbial metabolites are trapped on the outer surface of the hollow fiber membrane. Part of the raw water flows along the membrane surface at a high speed to form cross-flow concentrated water, which takes away most surface pollutants and reduces the formation of dense filter cake layers.

Cleaning Regeneration State

With long-term operation, a small amount of pollutants will adhere to the membrane surface and cause flux attenuation. The system automatically triggers two cleaning modes: regular backwashing uses clean produced water to reversely flush the membrane pores to wash off loose surface dirt; periodic CIP chemical cleaning uses sodium hypochlorite, sodium hydroxide and dilute acid mixed medicament to dissolve biological slime and organic scaling, restoring the original flux of the ultrafiltration membrane and guaranteeing long-term stable water output efficiency of the equipment.

3. Technical Parameters

3.1 Core Membrane Basic Parameters

• Membrane material: Modified anti-fouling PVDF hollow fiber / Tubular PVDF

• Molecular weight cut-off (MWCO): 50 kDa, 100 kDa

• Nominal filtration aperture: 0.01 μm ~ 0.1 μm

• Continuous working temperature range: 5 ℃ ~ 45 ℃

• Operating pH range: Stable operation pH 2–11; cleaning tolerance pH 1–13

• Recommended design flux: 20 ~ 70 LMH (adjusted according to raw water pollution degree)

3.2 System Operation Indicators

• Produced water turbidity ≤ 0.1 NTU

• Interception rate of bacteria and microorganisms ≥ 99.99%

• Overall water recovery rate of the whole UF system: 78% ~ 90%

• Stable operating pressure: 1.2 bar ~ 3.2 bar

3.3 Equipment Hardware & Control Parameters

• Equipment support frame: Standard 304 stainless steel; 316L stainless steel customized for corrosive water

• Control system: Touch screen + PLC automatic linkage control

• Adjustable automatic backwash period: 10–60 minutes

• Conventional chemical cleaning cycle: 1 ~ 6 months

• Customizable single set water yield range: 0.2 t/h ~ 250 t/h

4. Product Quality & Manufacturing Assurance

All ultrafiltration equipment produced by Xinxiang Lifeierte Filter Corp., Ltd implements full-process quality management from raw material incoming inspection to finished product delivery. Each batch of ultrafiltration membrane elements undergoes 100% bubble point test and tensile test to eliminate fiber breakage and leakage risks. Stainless steel pipelines and frames adopt precision argon arc welding, with pressure tightness test carried out after welding to prevent pipeline leakage during long-term operation.

Every finished ultrafiltration equipment must complete FAT factory acceptance test under simulated actual working conditions before leaving the factory. Engineers test water yield stability, pressure difference change, backwash effect and control program response one by one to ensure the equipment can run stably after arriving at the customer site. Our ultrafiltration equipment has ISO9001 quality system certification and CE safety certification. Under standardized operation and regular maintenance, the service life of PVDF ultrafiltration membrane can reach 5–8 years. We provide global spare parts supply and free remote technical commissioning guidance for all customers purchasing our ultrafiltration equipment.

5. Main Application Fields of Ultrafiltration Equipment

1. Reverse osmosis pretreatment: Reduce RO membrane pollution, stabilize RO inlet water SDI value within 3

2. Industrial wastewater reclamation: Treat biochemical tail water for factory cooling water, flushing water reuse

3. Food and beverage water preparation: Purify raw water to meet production process water hygiene standards

4. Pharmaceutical purified water production: Remove microorganisms and colloids to meet pharmaceutical industry water requirements

5. Municipal sewage advanced treatment: Realize urban miscellaneous water reuse for road cleaning and green irrigation

6. Electroplating, printing and dyeing wastewater depth treatment: Reduce pollutant discharge and save fresh water consumption for enterprises

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