Nanofiltration ultrafiltration equipment is a two-stage combined membrane separation device, which integrates ultrafiltration pre-filtration and nanofiltration fine separation to realize graded purification of raw water and wastewater in industrial production. Our factory provides matched industrial liquid filter together with a full set of membrane separation products, including integrated desalination skid units Ultrafiltration Equipment Reverse Osmosis Combined Water Treatment System, customized water treatment skid-mounted devices Ultrafiltration Equipment Company Providing Custom Water Treatment, complete UF-NF integrated finished products Professional Manufacturer of Ultrafiltration and Reverse Osmosis Equipment, standard industrial membrane filtration devices Ultrafiltration Membrane Water Treatment Equipment for Industrial Use and high-throughput hollow fiber ultrafiltration devices High Efficient Hollow Fiber Ultrafiltration Equipment. The front ultrafiltration unit intercepts particulate pollutants, colloids and microorganisms, while the rear nanofiltration membrane removes partial hardness, organic matter and chroma, effectively optimizing water quality without excessive desalination like reverse osmosis. This paper elaborates the overall structure, cross-flow filtration mechanism, standardized technical indexes, strict whole-process quality inspection standards and actual operation stability of our nanofiltration ultrafiltration combined equipment. Global environmental contractors, factory procurement departments and overseas distributors can purchase in-stock products, customize personalized solutions and obtain long-term professional after-sales technical support to keep the water system running stably and reasonably control daily operation and maintenance costs.
Dual Stage Nanofiltration Ultrafiltration Industrial Water Treatment Equipment
Nanofiltration ultrafiltration equipment is a two-stage combined membrane separation device, which integrates ultrafiltration pre-filtration and nanofiltration fine separation to realize graded purification of raw water and wastewater in industrial production. Our factory provides matched industrial liquid filter together with a full set of membrane separation products, including integrated desalination skid units Ultrafiltration Equipment Reverse Osmosis Combined Water Treatment System, customized water treatment skid-mounted devices Ultrafiltration Equipment Company Providing Custom Water Treatment, complete UF-NF integrated finished products Professional Manufacturer of Ultrafiltration and Reverse Osmosis Equipment, standard industrial membrane filtration devices Ultrafiltration Membrane Water Treatment Equipment for Industrial Use and high-throughput hollow fiber ultrafiltration devices High Efficient Hollow Fiber Ultrafiltration Equipment. The front ultrafiltration unit intercepts particulate pollutants, colloids and microorganisms, while the rear nanofiltration membrane removes partial hardness, organic matter and chroma, effectively optimizing water quality without excessive desalination like reverse osmosis. This paper elaborates the overall structure, cross-flow filtration mechanism, standardized technical indexes, strict whole-process quality inspection standards and actual operation stability of our nanofiltration ultrafiltration combined equipment. Global environmental contractors, factory procurement departments and overseas distributors can purchase in-stock products, customize personalized solutions and obtain long-term professional after-sales technical support to keep the water system running stably and reasonably control daily operation and maintenance costs.
Nanofiltration ultrafiltration equipment adopts graded membrane separation design, taking polymer hollow fiber ultrafiltration membrane and composite nanofiltration membrane as core filter materials. The ultrafiltration system acts as security pretreatment to block macromolecular impurities, and nanofiltration performs fine purification on permeate water from ultrafiltration. Compared with single ultrafiltration equipment or simple reverse osmosis equipment, this combined equipment has moderate desalination capacity, low operation pressure, low energy consumption and convenient membrane cleaning conditions, which fills the purification gap between ultrafiltration and reverse osmosis in water treatment process. Our mainstream ultrafiltration components are modified anti-pollution PVDF hollow fiber membranes, matched with roll-type composite nanofiltration membranes with special selective separation performance, adapting to circulating water treatment, food liquid decolorization, wastewater reuse and other medium-pollution water quality conditions in various industries.
A complete nanofiltration ultrafiltration equipment is composed of ultrafiltration membrane components, nanofiltration membrane module, stainless steel bearing frame, raw water booster pump, automatic backwash valve group, online acid-base dosing cleaning system, front-end security liquid filter and PLC centralized intelligent control cabinet. After two-stage membrane filtration, the produced water can meet the reuse standard of industrial medium-purity water, reduce the salt content and organic pollution load of water body, and avoid the high operating cost brought by full reverse osmosis treatment. All finished combined equipment will pass air tightness pressure test and 72-hour uninterrupted full-load aging test before delivery, preventing unexpected shutdown faults in long-term continuous on-site operation.
We launch differentiated membrane filtration products to satisfy diverse project requirements. Customers requiring synchronous filtration and partial desalination can choose Ultrafiltration Equipment Reverse Osmosis Combined Water Treatment System to complete overall water treatment with one integrated device. For projects with special requirements for water volume, equipment layout and on-site limited space, we support drawing customization and personalized production via Ultrafiltration Equipment Company Providing Custom Water Treatment. Buyers needing matched nanofiltration and ultrafiltration supporting assemblies can select integrated finished products supplied by Professional Manufacturer of Ultrafiltration and Reverse Osmosis Equipment. Conventional factory circulating cooling water and general wastewater recovery treatment adopt cost-effective standard Ultrafiltration Membrane Water Treatment Equipment for Industrial Use. Large-scale water treatment projects pursuing high overall operating efficiency are equipped with High Efficient Hollow Fiber Ultrafiltration Equipment to improve the whole water station processing efficiency.
Standard frames and pipelines are made of SUS304 stainless steel by default; SUS316L stainless steel is selected for brackish water, slightly acidic and alkaline wastewater working conditions to prevent electrochemical corrosion and extend the service life of pipeline accessories. The control system supports local touch screen operation, with optional remote real-time monitoring function for unified remote management. Our company provides spot standard equipment, non-standard customized development, OEM processing service and complete CE certification documents to help overseas customers smoothly complete customs clearance and project acceptance procedures.
The nanofiltration ultrafiltration combined system adopts pressure-driven cross-flow graded filtration mode. The built-in PLC program automatically switches three working modes: normal water production, automatic backwashing regeneration and regular chemical deep cleaning.
Original water firstly removes large granular impurities through the front liquid filter, then is transported into the ultrafiltration membrane shell by the raw water pump. Ultrafiltration membrane relies on physical pore screening to intercept suspended solids, colloids, algae and microbial substances; clean permeate enters the intermediate water tank and is boosted into the nanofiltration module. Nanofiltration membrane uses charge repulsion and molecular sieve dual effects to intercept macromolecular organic matter, partial divalent metal ions and pigment substances, finally outputting high-quality reuse water. Cross-flow water flow continuously washes the membrane surface during operation to slow down the accumulation of pollutant filter cake and stabilize system water production flux.
With the accumulation of pollutants on the membrane surface, the inlet and outlet pressure difference of ultrafiltration and nanofiltration modules will rise gradually. When the pressure difference reaches the preset alarm threshold, the system automatically switches the valve pipeline. Clean produced water washes the membrane surface reversely to flush away loose pollutants, and the waste dirt is discharged out of the equipment along with concentrated water. The whole backwashing process lasts only 3–8 minutes and will not cause long-time shutdown of the whole water treatment system.
Conventional backwashing cannot remove stubborn organic fouling and scale attached to the membrane pores. The supporting dosing system is equipped with pickling and alkaline cleaning agents for circulating immersion cleaning, restore the original flux of ultrafiltration and nanofiltration membranes, and maintain the efficient and stable operation of the whole set of equipment for a long time.
Ultrafiltration membrane material: Modified anti-fouling PVDF hollow fiber membrane
Nanofiltration membrane type: Composite rolled nanofiltration membrane
Ultrafiltration nominal pore size: 0.01 ~ 0.05 μm
Nanofiltration molecular weight cut-off: 150 ~ 800 Da
Ultrafiltration interception rate of bacteria and colloids ≥99%
Nanofiltration removal rate of organic matter and hardness: 60% ~ 90%
Effluent SDI value ≤ 5
Single set water treatment capacity: 1m³/h ~ 180m³/h
Ultrafiltration working pressure: 0.10 ~ 0.30 MPa
Nanofiltration working pressure: 0.4 ~ 1.6 MPa
Applicable water temperature range: 5℃ ~ 40℃
Long-term applicable pH value: 2 ~ 11
System comprehensive water recovery rate: 70% ~ 82%
Adjustable backwash cycle: 10 ~ 60 min; chemical cleaning cycle: 1 ~ 3 months
Frame & pipeline material: SUS304 / SUS316L stainless steel (selected according to actual water quality)
Control form: PLC + touch screen full automatic control, remote monitoring optional
Standard accessories: Raw water pump, high-pressure pump, backwash pump, acid-base dosing tank, pressure transmitter, front security liquid filter
All nanofiltration ultrafiltration combined equipment is produced strictly in accordance with ISO9001 international quality management system standards, and export products are equipped with official CE certification to meet market access requirements of global water treatment industry.
Incoming material inspection: Membrane elements, steel structural parts, pumps, valves and electrical components are sampled and tested before warehousing to block unqualified raw materials at the source.
Production process inspection: QC inspect membrane assembly, pipeline welding, circuit wiring and instrument calibration item by item, and establish traceable quality files for each production link.
Factory inspection: Each finished equipment must complete air tightness test and full-load aging test before delivery to eliminate potential hidden dangers of field operation failure.
Export packaging & delivery cycle: Adopt sealed moisture-proof, shock-proof and rust-proof wooden case packaging for ocean transportation. Standard conventional products are in sufficient stock to respond to urgent customer orders; the delivery period of customized equipment is controlled within 12–28 working days.
With standardized daily operation and maintenance management, the service life of PVDF ultrafiltration membrane can reach 3–5 years, and the service life of nanofiltration membrane can reach 2–4 years. We provide global spare parts supply and lifelong free remote technical guidance for all cooperative customers and engineering partners.
Food & beverage industry: Decolorization, impurity removal and concentration purification of fruit juice, sugar liquid and brewing wastewater
Industrial circulating water system: Circulating water scaling reduction, suspended matter removal and water quality stability maintenance
Printing and dyeing wastewater treatment: Chroma removal and partial salt reduction of printing and dyeing tail water for water reuse
Pharmaceutical chemical industry: Clarification and purification of pharmaceutical intermediate liquid and low-concentration chemical wastewater
Municipal reclaimed water project: Advanced purification of municipal secondary effluent for greening and road washing water reuse
Q1: What are the prominent advantages of nanofiltration ultrafiltration combined equipment compared with single ultrafiltration equipment?
A: Single ultrafiltration can only remove suspended solids and microorganisms, unable to remove organic matter, pigment and partial hardness. The matched nanofiltration unit can realize fine purification with moderate desalination, lower operating pressure and energy consumption than reverse osmosis equipment, greatly expanding the applicable scenarios of water reuse.
Q2: Can water flow, pipeline material grade and automatic operation logic be customized according to customers’ actual water quality detection reports?
A: Yes. Our technical team will match membrane specifications, pump power and pipeline materials according to user water quality data, optimize backwashing and chemical cleaning programs, and formulate targeted non-standard design schemes.
Q3: What are the delivery cycles of standard spot equipment and customized modified nanofiltration ultrafiltration equipment respectively?
A: Conventional standard equipment represented by High Efficient Hollow Fiber Ultrafiltration Equipment can be delivered within 3–7 working days; customized equipment with structural and parameter adjustments takes 12–28 working days depending on modification scope and processing difficulty.
Q4: What pre-filter facilities should be installed at the water inlet of nanofiltration ultrafiltration equipment?
A: It is recommended to configure coarse filter + multi-media filter + security liquid filter at the front end to intercept large particle impurities, avoid scratch damage to membrane surfaces, and reduce the overall pollution load of ultrafiltration and nanofiltration modules.
Q5: Which parts of nanofiltration ultrafiltration equipment are covered by the factory official warranty?
A: Stainless steel frame, water pumps, valve bodies, PLC control cabinet and detection instruments enjoy a 1-year global warranty; ultrafiltration and nanofiltration membrane elements belong to consumables and are not within the warranty scope.
Q6: Can multiple nanofiltration ultrafiltration units operate in parallel to increase the overall wastewater treatment capacity of the water station?
A: Parallel operation is fully supported. Multiple sets of equipment are connected to the main water pipeline with unified central automatic control, which is convenient for customers to expand water treatment capacity in batches with the expansion of factory production scale.
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