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Our continued success in those industries has allowed us to invest heavily in the water and wastewater sector, which includes our innovative WSM- MBR, and WSO ultrafiltration modules.

  • WESHTER WSO UF

    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 fresh water. 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.

    WESHTER WSO UF modules are constructed using 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 helps in virus removal.

    With WESHTER WSO, 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.

    WESHTER WSO 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.

WESHTER WSI UF

Ultra-filtration (UF）is a membrane separation process that allows small molecules to pass through the membrane while retains large molecules, colloidal substances or particles. 
UF membrane technology is currently used in a great deal in water purification, where water and dissolved minerals, small organic molecules may pass through the membrane and most of the other contaminants including bacteria, virus, most of colloidal substances and suspended solid are removed from the treated water. This process is widely used in pretreatment for reverse osmosis (RO), for drinking water treatment and for water recycling.
UF technology also plays a key role in the clarification of liquor and drinks, in the removal of indo-toxins from drug solutions, and in the concentrating of drugs and chemicals.
The pore size of UF varies in a large range and has not well defined scientifically. The mostly accepted pore range for UF is 0.002-0.1 m with molecular weight cut off (MWCO) 1,000-1,000,000 Dalton.  For water treatment, the MWCO values of most of the UF membrane are in the range of 30,000-300,000 Dalton. UF membrane with MWCO smaller than 30000 Dalton is usually used in separation and concentration processes.
There are many deferent types of UF membrane, those includes spiral wound flat sheet, pipe type, capillary, and hollow-fiber. For water treatment, most of the membrane used is in capillary type. Capillary membrane is also called hollow-fiber membrane in many cases. 
Membrane capillaries or membrane hollow-fibers have to be assembled together to form membrane elements or membrane modules. UF membrane element may be made into inside-out pressurized, outside-in pressurized or submergible forms. The submergible form is more suitable for micro-filtration membrane because the driving force created by vacuum is usually not enough for UF membrane. The flow rates across the capillary outside surfaces in an outside-in pressurized element are uneven in a great deal from one membrane capillary to another, and that reduces the effect of flushing and backwashing of the membrane. Weshter UF membrane elements may be operated outside-in or inside out modes, but it is highly suggested to operate  Weshter WSI UF element in an inside-out pressurized form, and such ensure better membrane fouling recovery and higher flux rate. 
The designers and technology developers of Weshter UF membrane have truly believed that their customers concern mainly three aspects of UF membrane, steady flux (steady production of filtered water), permeate quality, and membrane longevity. Weshter has developed a whole series of technologies to ensure that the Weshter UF membrane offers superior properties on all these aspects.

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