Ultrafiltration Systems-UFC-UFD series

Description

Key Features

  • Removal of feedwater turbidity
  • Constant filtrate quality
  • >99.9% bacterial and virus rejection
  • Low energy and water consumption
  • Fully automated PLC control
  • Compact skid mount design
  • Optional pressure pump/valve skid

Applications

  • Surface water clarification
  • RO pre-treatment
  • Waste water treatment
  • Dewatering of concentrate solutions

Process Description

Ultra-filtration is a membrane filtration process using a differential pressure across a membrane surface to separate particulates from a feed source.  ROtek UFD/C systems use spiral wound membrane designs.  ROtek UFD/C systems are designed to remove high molecular weight contaminants, colloids, bacteria, organic and inorganic polymeric materials and any contaminant with a molecular weight above 50,000 Daltons from a feedwater supply.  Ultra-filtration systems use less than 20% of the energy required by reverse osmosis systems at significantly lower pressures 

Ultra Filtration Systems

Ultrafiltration is the method of choice in many water filtration applications where variable suspended solids loads is commonplace and where removal of bacterial and organic contamination is desirable.  The table below illustrates the place of ultrafiltration in comparison with other water purification technologies.

Method Dissolved
ionised solids
Dissolved
organics
Dissolved
ionised gases
Particulates Bacteria Pyrogens
Deionisation Excellent Poor Excellent Poor Poor Poor
Adsorption Poor Excellent Poor Poor Poor Poor
Filtration Poor Poor Poor Excellent Excellent Poor
Ultrafiltration Poor Good Poor Excellent Excellent Excellent
Reverse osmosis Good Good Poor Excellent Excellent Excellent
Distillation Excellent
/Good
Good Poor Excellent Excellent Excellent
UV oxidation Poor Good Poor Poor Good Poor

While a microporous membrane filter removes particles according to pore size, ultrafiltration membranes function as a molecular sieve, separating dissolved molecules out of the feedwater or source material based on particle and molecular size by passing the solution through diminutively small pore size filters.

An ultra-filter is a robust, selectively permeable membrane that retains most macromolecules above a particular molecular weight (10K and 40K are commonly used).  Retained materials include colloids, micro-organisms and pyrogens while smaller molecules such as ionised contaminants or solvents will pass through.  Ultra-filters may be regenerated and as such play an expanding role in water treatment systems, particularly due to their pyrogen removal capability.

Ultra-filtration may be combined with UV sanitation systems for a double stage microbial barrier.  Chemical dosing systems for sodium hypochlorite (“hypo”) may also be integrated into the systems for additional protection with a residual sanitiser to have the best protection from microbial contamination.

 

Filtration Spectrum