CleanTech 2000: Membrane Filterless Recycling System
Source: Separation Dynamics
Extran recycling systems make use of its manufacturer's diffusion separator, a PVC housing consisting of thousands of cellulose fibers, which are hydrophilic in nature and resist most organic solvents, oils, and hydrocarbons
Separation Dynamicscling systems make use of its manufacturer's diffusion separator, a PVC housing consisting of thousands of cellulose fibers, which are hydrophilic in nature and resist most organic solvents, oils, and hydrocarbons. Because the fibers are naturally hydrophilic, they allow water to flow freely through them, eliminating the pore plugging and need for chemical cleaning and backflashing commonly found in conventional membrane filtration systems. Thus, the extra step of membrane module cleaning is eliminated. Each cellulose fiber has an inside diameter of 400 µm and a wall thickness of 40 µm.
The system separates free oil, emulsified oil, and other particles from the wastewater and then continually filters the washing fluid and cleansers, redirecting the cleaned water to the washer for reuse. The manufacturer states that the system's ability to continually filter wastewater and prepare it for reuse cuts costs dramatically by allowing longer bath life, reduced waste and reduced cleaning solution use. It can operate over a wide temperature (up to 180°F) and pH (2-13) range, providing consistent part cleanliness.
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