HOLLOW FIBER ULTRAFILTRATION MEMBRANE MODULES
Water resources continue to be one of the top environmental concerns around the world, leading to increased water recycling efforts in water and wastewater treatment facilities globally and reducing the consumption of freshwater. Getting wastewater to an acceptable level of purification for water reuse can be challenging as it requires several steps. On the other hand, it is important to have access to pure drinking water free from suspended solids and harmful pathogens. Ultrafiltration (UF) has shown demonstrated success in both applications.
UF is a process using a physical barrier to separate water and suspended solids, turbidity, silt, bacteria, and viruses from the feed water. In a system using pressurized PureULTRA hollow fiber modules, the feed water may come from different sources such as surface water, groundwater, secondary or tertiary treated industrial wastewater, or other sources like tertiary treated municipal wastewater.
PureULTRA UF modules are constructed using a highly hydrophilic modified PVDF hollow fiber membrane with a nominal pore size of 0.05 micron. The outside-in flow configuration contributes to easier cleaning as it keeps the solids, pathogens and other foulants on the outside of the fibers. The fiber is designed to handle most feed water sources and tolerate solids loadings while operating within an optimal flux range. It rejects particulate matter, Giardia cysts, and Cryptosporidium oocysts, and can help in virus removal.
With PureULTRA, most particles larger than 0.05 micron are rejected while much finer molecules (e.g., water and dissolved solids) pass through the tight pores of the hollow fiber membrane. Our unique permanently hydrophilic membrane is formed using PVDF polymer that is inert, to a great degree, to strong oxidants, allowing the hollow fiber to be cleaned aggressively during chemical cleaning cycles.
The membrane module design and hydraulics of PureULTRA allow complete solids removal during drain cycles and therefore minimal fouling or chance of continual solids accumulation. These UF modules are designed to run at very low pressure (~0.02 Mpa / 3.0 psi) while operating at optimum fluxes. While the air diffuser installed in the modules leads to very high air penetration, the soft potting allows for fiber movement. Combining these features results in effective solids removal and minimal fiber breakage.
PureULTRA modules can be operated at low pressures and optimum flux, leading to lower operating costs. The ability to clean the membrane and the overall module design leads to increased membrane life, lowering module replacement costs.