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It is a membrane separation technology to separate high molecular weight compounds colloidal substances, proteins, microbiological contaminants and large organic contaminants from feed stream. The pore sizes of the membranes are too small that they remove all suspended matters, bacteria, virus and pathogens. Particles of about 0.005 microns to 0.05 micron ( MW > 30,000 to 5,00,000 Dalton) or larger are retained by ultra filtration membranes.
Due to the availability of range of pore sizes in Ultra filtration membranes, this process finds use in a wide variety of industrial applications ranging from reclaiming treated sewage water to separating proteins in biotechnology applications. The operating pressure for Ultra filtration process is usually 0.5 – 3 bar.
The Ultra filtration membranes also retain viruses, bacteria and protozoa cysts present in the water. Reverse Osmosis and Nan filtration can also retain these pathogens, however they require relatively higher operating pressure. In addition, the spiral wound configuration of RO and most NF membrane modules mitigate against the total retention of pathogens. UF membranes, when used in the hollow fiber form, provide the appropriate configuration for the total removal of pathogens.
Ultra filtration membranes from Membrane Technology, are specifically in the hollow fiber configuration.
Advantages
Ultra-filtration offers several advantages over conventional methods:
Low pressure operation
Lower floor space
Lower power consumption
Negligible chemical consumption
Minimal manpower attention
Eco-friendly – Eliminate handling chemicals and solid waste
Modular Systems – Capacity can be expanded by simply adding membrane modules
Cost effective and attractive pay-back period
MTL Module Structure
Application of Ultra-filtration
Ultra-filtration Membrane Module
400 Dia - 200 M2 Membrane - Area - Module - First in the World
Cross Section of a Hollow Fiber Membrane
Hollow Fiber Configuration
Ultra-filtration membranes could be bundled into several types of module configuration including hollow fibers, flat sheets and tubes. Flat sheets could be bundled in spiral wound configuration or used in plate-and-frame configuration. Hollow fibers provide very high surface area per unit volume. As filtration rate is directly proportional to the surface area, hollow fibers offer very high productivity. There are several significant advantages using hollow fiber configuration that cannot be offered by other configurations.
Hollow fiber modules posses minimum dead space.
Hollow fiber modules can be cleaned with frequent’ backwash thus yielding longer life to the membranes.
Hollow fibers can be designed to have dimensions specifically suitable for minimizing “membrane fouling” in a given application
Hollow fiber offers largest membrane area per unit volume. Thus producing systems with lower foot print.
Typical Components of UF System
Ultra-filtration - Model
Ultra-filtration Vs Conventional Method
Type
Ultra-Filtration
Conventional Method
Product Quality Consistent Varies with feed quality
Operation Easy Complicated
Sludge Reduced Sludge Produced
Coagulant Not required Required
Downstream RO Longer Life Short Life
Floor Space Small Large
Different Sizes of Membranes
Dia, mm
Length, mm
Membrane Surface Area, M2
32 x 100 0.1
40 x 250 0.3
50 x 150 0.4
65 x 250 0.5
90 x 1000 8.0
200 x 1535 30
400 x 1530 200
UF System used as a Pre-treatment Step
Ultra-filtration membranes can be tailored to suit various applications.
Type of Feed Water Use of Ultra-Filtration
Sea Water / Brackish Water Remove micro-organism, turbidity, reduce SDI <1, treated water used as cooling water or as feed to RO system
Treated Municipal Wastewater Remove suspended particles, COD, BOD, Reduce SDI<1, Treated water fit for industrial use
Well water, Surface water, Rain water Remove colloidal particles, bacteria, virus, treated water can be used for drinking / industrial processes.
Ultra-filtration membrane systems can play a vital role in the following industries as well.
Textile Industry
Segregate, recover and recycle dye bath and associated rinses.
Recovers salt for re-use/ reduces salinity in the effluent.
Reduces sludge formation
Sugar Industry
Recycle condensate from Evaporator to high pressure boiler and cooling tower.
Clarification and concentration of sugar juice.
Paper Industry
To reduce effluent load & reuse the water.
Fertilizer Industry
To recover and recycle cooling tower blow down water.
Petroleum Industry
To remove suspended and colloidal particles from the treated refinery effluent.
Chlor Alkali Industry
In the purification of Brine
Membrane Technology has supplied membrane systems to Europe, USA, Australia and South Africa. The performance of our membranes has won all-round recognition and appreciation. Membrane Technology has received commendation on th performance of out pilot that working at end of the largest refineries in India.