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Crossflow Membrane Filtration vs. Conventional Filtration vs. How Membrane Technology is applied
RO, NF, UF and MF separation technologies all combine pressure with unique membranes to remove or concentrate substances from a feed solution, or stream.
Primary Competitive Advantages
.crossflow filtration differentiates itself from conventional filtration by .employing distinct fluid dynamics to its advantage. The feed stream is split .into two streams: a permeate stream and a concentrate stream. As illustrated .Photo (1) below, part of the feed stream is going through the membrane (creating .the filtered permeate stream), and part going across or parallel to the membrane, .creating the concentrate stream, or brine. This crossflow filtration system is .unlike conventional dead end filters, which flow in one direction – through the .filter. The major advantage of crossflow filtration is that the components of the .away, thus continually cleaning the membrane surface. This prolongs its life and .reduces maintenance and cleaning costs. In contrast, conventional filters .accumulate the captured components on the filter medium and must be periodically .cleansed replaced, posing obvious economic and/or environmental disadvantages. .Photo (2) The crossflow and permeate recovery is regulated by a flow control valve. It is .important that this pressure is regulated in such a manner that sufficient feed .stream is allowed to pass, thereby cleaning the membrane surface. Otherwise .membrane fouling may occur. Simultaneously, it is also important that pressure is .regulated in such a manner that optimum pressure exists upon the membrane surface .to create the permeate stream. As applications and feed streams vary, it is .evident how critical the role is of the membrane since it’s functional .responsibility is to be the selective gatekeeper of the passing, pressurized feed .stream. Responsiveness to different feed streams under different pressures can .produce different outcomes. This is why it is critical to utilize the right .membrane for your operation to achieve the greatest efficiency.
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