VPMF

It has been well known that a typical filter shows inactive efficiency in treating wastewater due to a fixed pore structure.
VPMF (Variable Pore-structure Micro Filter) is equipped with a filter mounted in the inner flange of the pressure vessel,
which micro-fiber is cut at equal length and then remodeled into a cylindrical shape.  In filtering, the pressure from the
inflow of raw water compresses the fiber and then the filtering is initiated by the depth of the laminated fibers.

VPMF forms a temporary filter structure by compressing the laminated micro fiber layers according to water flow, and then,
by backwashing, dissolves such laminated layers or finally the filter structure.  In other words, VPMF conducts a depth filtering
against laminated micro layers, and then easily separates the pollutants gathered between the micro fibers during the dissolution of the layers.

The size of the particles that VPMF can filter are
• 25 micron (LQ)
• 5 micron (MQ)
• 1 micron (HQ)
• 0.5 micron (SQ)
• 0.2 micron (SQ)

Operation principle of VPMF
 
Filtering Process   
 
The inflow of raw water through its inlet gradually compresses the cylindrical filter.   If the filter pressure reaches critical (or optimum) depth,
no filter pressure will occur. Through the pressure filter layer the raw water will be filtered for discharging the water into an effluent inlet. 
      
 
Backwashing 
     
In backwashing, water and air are poured through the effluent outlet, the compressed filter is gradually expanded in an upward direction. 
Thereafter the pore structure divides into pieces and the fine air bubble separates the pollutants caught between the filters to discharge it into
the raw water inlet. At this time, the cylindrical filter slightly vibrates itself resulting in synergism of washing and thus conducts full backwashing. 
 
      
 Advantages

• Backwashable and long life of the filter
• Filtering takes considerable time because of depth filtering.  
• No loss of filter material is expected, and thus there is no need of supplement of filter material. 
• Easy to replace the filter neatly.
• Compact design.
• Backwashing time is short. The volume of concentrated water is little. The treated water is rarely wasted. 
• Available for unmanned automatic operation.  
• Cost effective in operation
• A full range of application from smaller to larger capacity.
• Modulized design brings ease of expansion.  
• Only replacement of a filter element is required when enhancing the quality of water.

Applications

Model Name Particle Size  Application
VPMF-LQ  25µ       Cooling water recycling,
     Removal of chlorophyceae in lakes and fish farms
VPMF-MQ         5µ     Replacement of cartridge and sand filters
     Removal of suspended solids in the industrial wastewater
     Removal of SS and BOD in effluent of sewage purification plant
     Recycling following removal of suspended solids in sewage treatment plant
     Pre-treatment of membrane filters (R/O, NF)
VPMF-HQ   1µ    Replacement of sand filter in water treatment plant
     Purification treatment in swimming pool
     Pre-treatment of high level treatment  (i.e.; activated carbon, ion exchange resin, ozon,   and UV, etc.)
     Pre-treatment of membrane filters (R/O, NF)
VPMF-SQ  0.2-0.5µ   Filtering of the industrial water and recycling of the industrial wastewater
     Pre-treatment of membrane filters (R/O, NF)
     Sewage and gray water treatment by direct filtering. 
 
 
 
  Apart from these applicable areas, the VPMF can be used in various production lines requiring filtering.