Potable Water
Wastewater / Sewage
Chemical Industry
Power Plants
Automotive / Industrial
Pharmaceutical and Food (2)

Microza - Highly Efficient, Precise Filtration, Durable Module.
Deployed in various liquid separation, filtration, and purification processes.
Microza is a filtration module containing unique hollow fiber membranes developed by Asahi Kasei for filtration systems. Several types of hollow fiber membranes are available, and in various organic polymers. Liquid filtration takes place through the pores, or gaps, in the hollow fiber wall structure. Microza membranes have sharp pore size distributions that provide superior and stable filtration performance.
There are two categories of Microza hollow fiber membranes; 1- microfiltration (MF) membranes and 2 - ultrafiltration (UF) membranes. These are available in a variety of product types and system configurations to meet variant filtration requirements. Microza has an established track record for high performance in a wide variety of applications. These are not limited to the chemicals and precision electronics industries, but are also applicable and receiving very high ratings in municipal water, wastewater, food, pharmaceutical, energy, and environmental applications.
In the below figure, the center bar notes membrane separation methods employed to separate substances that correspond approximately in size to the example substances noted. The lower portion of the figure notes corresponding ASAHI KASEI products to accomplish such separations.
Ultrafiltration (UF)
Pores of UF membranes have an approximate size range of 0.001μm to 0.01μm. Hence the filtration separation is at the molecule level. Microza UF membranes employ a unique "double skin" construction with a UF skin layer on both the inner and outer surface of the hollow fibers. Thus liquids are filtered twice to provide high quality filtration.
Microfiltration (MF)
Pores of MF membranes have an approximate size range of several μm to 0.1μm. Suspended solids and colloidal particles in liquids can be separated efficiently and with precision. Microza MF has also demonstrated high permeability, long sevice life, and separation capabilities for water clarification.

Microza UF
Microza MF
Membrane materials
Molecular weight cut-off / nominal pore size
3,000 - 80,000
0.1 - 0.65μm
Membrane ID (mm)
0.6 - 1.4
0.7 - 2.6
System applications
1.Production of drinking water
2.Clarification of industrial water - wastewater treatment
3.Production of ultra-pure water
4.Recovery of electrodeposition paints
5.Purification of inorganic colloids
6.Concentration of enzymes
7.Purification of antibiotics
8.Preparation of sterile water for pharmaceutical use
1.Production of drinking water
2.Clarification of industrial water, wastewater treatment
3.Purification of fermentation broths
4.Treatment of power plant condensation water
Filtration mode
Inside-out and outside-in filtration

Inside-Out filtration
A high cross-flow velocity over the membrane surface prevents membrane fouling. This makes inside-out filtration suitable for concentration and purification of highly concentrated solutions.
Outside-In filtration
Utilizing the lager area of the outer surface of the membrane fiber, the filtration load per unit area may be reduced. Additionally, a physical cleaning technique such as 'air-scrubbing' may be utilized. These features make this mode of operation well suited for high volume water clarification.
Microza UF and MF modules for water clarification use hollow-fiber type membranes for outside-in filtration.
Advantages of Microza UF & MF for water clarification
1. High permeability membrane and large-scale modules enable high flux and compact installation space.
2. Microza UF & MF systems allow reverse filtration with sodium hypochlorite (NaClO) and 'air scrubbing', resulting in stable permeate flux.
3. Ultrafine pores of the membranes produce high quality permeate. Permeate quality is maintained even when turbidity of feed water fluctuates.
4. Microza UF modules use hydrophilic PAN membranes with a 'double-skin' structure, while Microza MF modules use PVDF membranes for outstanding physical strength and chemical resistance. Both modules offer long-term reliability.