Microfiltration Technology Standards and Application of Ultrafiltration Technology

This article provides an in-depth analysis of microfiltration technology standards and explores the widespread application of ultrafiltration technology in modern water treatment, including drinking water purification, industrial water supply, seawater desalination, and wastewater reuse. It is designed to assist engineers, project designers, and water treatment professionals in understanding technical specifications and enhancing system performance.

To guarantee stable operation, high filtration efficiency, and compliance with safety standards, microfiltration equipment must meet the following technical specifications:

• The equipment’s rated water production, filtration precision, and filtration efficiency must meet or exceed the designed values.
• Filtration accuracy should ensure removal of suspended solids, microorganisms, and fine particulate matter.

• The system should feature a compact and reasonable design.
• All components—including membrane modules, pumps, valves, and sensors—must meet relevant national or industry standards.
• For equipment used in drinking water treatment, all water-contact materials must comply with GB/T 17219 safety regulations.

• System frames must be firmly installed with smooth welds and evenly coated surfaces.
• Pipeline installations must be straight, leak-free, and follow the standards:
  • GB 50235 for metal pipe installation and welding
  • HG 20520 for general pipe installation and connection
• Pumps must operate smoothly without abnormal vibration.
• The electrical control system must be safe, stable, and comply with GB 4706.1 electrical safety standards.

Over the past 30 years, ultrafiltration technology has developed rapidly and is now widely used in multiple industries, including:

• Drinking water purification
• Food and pharmaceutical production
• Industrial wastewater treatment
• Biological products processing
• Metal finishing
• Petroleum processing

In large-scale water treatment projects, UF systems play a critical role in drinking water terminals, surface water treatment, wastewater reuse, and seawater desalination.

As global drinking water standards become stricter, water treatment companies face increased pressure to reduce microbial contamination.

Advantages of UF in drinking water purification:

• High microorganism removal efficiency:
  • Bacteria removal: up to 6 log
  • Virus removal: up to 4 log
• High membrane flux: up to 135 L/m²·h for low-turbidity water.
• Low maintenance: Lower frequency of backwashing and chemically enhanced cleaning.
• High recovery rate: Water recovery can reach 99%.
• If needed, a two-stage UF system can be designed to reuse backwash water, greatly improving water efficiency.

UF systems are widely used for purifying surface water to:

• Produce irrigation water
• Serve as pre-treatment for reverse osmosis systems
• Replace expensive municipal drinking water for industrial use

Industry Example

In the Netherlands, many facilities rely on UF technology to purify nearby lakes or rivers instead of purchasing costly municipal water. This provides a more economical and sustainable solution.

In water-scarce regions such as the Middle East, UF plays an essential role in seawater desalination.

Why UF is critical for RO desalination pretreatment:

• Traditional pretreatment methods often fail to provide stable RO feedwater.
• Many RO desalination plants operate at below 30% of design capacity due to membrane fouling.
• UF ensures:
  • Stable water quality
  • SDI (Silt Density Index) below 2
  • Low fouling risk
  • High RO system efficiency

UF can handle various seawater conditions without the need for pretreatment before UF, making it ideal for large desalination plants.

Many Western countries discharge treated wastewater directly into surface water—a practice considered wasteful today.

UF enables highly efficient wastewater recycling for:

• Industrial water
• Agricultural irrigation
• Urban reclaimed water systems
• Even potable water (with multi-barrier treatment)

Global Case

In Windhoek, Namibia, an 850-ton/hour water plant uses UF and advanced membrane technologies to convert treated wastewater into potable water—one of the world’s leading wastewater-to-drinkable-water projects.

Microfiltration and ultrafiltration technologies have become indispensable in modern water treatment. Microfiltration ensures system stability and compliance with industrial standards, while ultrafiltration offers high-efficiency separation, microbial removal, and reliable water quality control.

From drinking water and surface water treatment to seawater desalination and wastewater reuse, the application of ultrafiltration technology continues to expand globally, driven by rising water demand and tighter quality standards. For any water treatment project seeking efficiency, reliability, and sustainability, UF is a core technology worth adopting.

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Microfiltration removes larger particles and suspended solids, while ultrafiltration removes microorganisms, bacteria, and viruses. UF offers higher precision and safety for drinking water applications.

Because UF delivers stable, low-SDI feedwater that significantly reduces RO membrane fouling and increases water production efficiency.

UF can effectively remove turbidity and microorganisms, but additional treatment (activated carbon, RO, or disinfection) may be required based on water quality regulations.

Yes. UF is widely used as a pretreatment step before RO desalination to ensure stable operation and protect RO membranes.

Typically 3–7 years, depending on feedwater quality, operating conditions, and maintenance frequency.

Xi’an CHIWATEC Water Treatment Technology is a high-tech enterprise specialized in various water processing devices. Aside from these individual products, which cover a number of types and series, we can also help with related comprehensive engineering projects. Thanks to our hard work and dedication upon our founding, we are now one of the fastest-developing water treatment equipment manufacturers in Western China.

Further reading:

• Ultrafiltration
• Ultrafiltration applications
• Introduction to ultrafiltration (ultrafiltration membrane) technology
• Microfiltration technology standard and application of ultrafiltration technology
• Application of ultrafiltration technology in water treatment
• Ultrafiltration technology (UF) application range