Handbook of Industrial Membranes , 2nd Edition by K. Scott

By K. Scott

This guide includes worthy and important info and information in an simply obtainable layout in terms of using membranes. Membranes are one of the most crucial engineering parts in use this present day, and every 12 months an increasing number of powerful makes use of for membrane applied sciences are chanced on - for instance: water purification, commercial effluent remedy, solvent dehydration by way of per-vaporation, restoration of risky natural compounds, protein restoration, bioseparations and plenty of others.The speed of swap within the membrane has been accelerating quickly in recent times, occasioned partially by way of the call for of end-users, but in addition because of the funding in R&D via brands. to mirror those adjustments the writer has acquired the newest info from the various top providers within the enterprise. in a single whole quantity this detailed instruction manual supplies useful assistance to utilizing chosen membrane tactics in person industries whereas additionally delivering an invaluable advisor to apparatus choice and utilization.

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In these cases the final solution may require absolute filtration/(contaminant removal) at the point of use of the fluid, in for example high purity water rinsing operation in the electronics industry, with preceding filtrations used to restrict and control the growth of bacteria. 3 - M E M B R A N E S E P A R A T I O N P R O C E S S E S Microfiltration Filtration is a process for the separation of solid from a liquid, or a gas, stream by the mechanical means of sieving. A pressure differential is applied across the filter to maintain fluid flow through the filtration media.

The membrane function will depend on its structure as this essentially determines the mechanism of separation and thus the application. Two types of structures are generally found in membranes (solid material) symmetric or asymmetric. Symmetric membranes are of three general types; with approximate cylindrical pores, porous and non-porous (homogeneous). Asymmetric membranes are characterised by a non uniform structure comprising an active top layer or skin supported by a porous support or sub-layer.

The values of permeabilities of water and solute are both inversely proportional to the membrane (or membrane skin) thickness and proportion to the appropriate diffusivity of water or of a solute. Reverse osmosis typically operates at high pressure from 20 to 100 bar, much higher than ultrafiltration. The values of both permeabilities effectively determines the retention of the membrane, which can be expressed as R= K s / K [AP- Arc] (1 + Ks/K ( A P - An)) The choice of membrane material is thus very important in defining performance characteristics.

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