Alfa Laval - Espiral RO

Espiral RO

The reverse osmosis spiral membranes from Alfa Laval are based on a unique construction of either polyester or polypropylene support material in a sanitary full-fit design that provides optimum cleaning conditions. The spiral membranes are available with different reverse osmosis membrane types and in different combinations of length, diameter and feed spacer size

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Alfa Laval reverse osmosis spiral membranes use membranes with pores so minute that only small fractions of salts can pass through, along with the water that is the prime component of the permeate.

Certain organic compounds with low molecular weights can also pass - but only to a limited extent. However, it is impossible for any other components suspended or dissolved within the liquid flow (salts, sugars, etc.) to do so.

Alfa Laval reverse osmosis spiral membranes are used for the concentration of many feed streams particularly of heat sensitive products, pre-concentration prior to evaporation as well as product and water recovery from permeate streams and evaporator condensate. 

Alfa Laval offers two series of reverse osmosis spiral membranes with different NaCl rejection properties. The membrane materials are thinfilm composite cast on either polyester or polypropylene backing paper.

RO PE Series

The spiral membranes of this series are the types RO99 and RO90 having a NaCl rejection of 98% and  90% respectively.

RO98pHt Series

In this series you find the RO98pHt spiral membrane which is characterized by its high temperature tolerance compared to the RO PE series. The RO98pHt spiral membrane has a NaCl rejection of 98%.

Benefits

  • cost-effective operation due to low energy consumption
  • cover a broad range of salt permeabilities
  • available in different combinations of length, diameter and spacer size
  • sanitary design with all materials in compliance with EU regulation (EC) 1935/2004, EU Regulation 10/2011 and FDA regulation (CFR) Title 21. USDA approved
  • same membrane types available as both flat sheet membranes and spiral membranes
  • suitable for extensive range of processes
  • suitable for processing at low temperature
  • manufactured by Alfa Laval's own membrane centre

Cómo funciona

La tecnología básica tras filtración por membrana implica el uso de una membrana semipermeable para separar un líquido en dos corrientes distintas.

El bombeo de este líquido a través de la superficie de la membrana crea una presión transmembrana positiva que permite el paso de cualquier componente más pequeño que la porosidad de la membrana, formando el permeado.

Cualquier componente más grande que el tamaño del poro no puede pasar y queda atrás en lo que llamamos retenido. La superficie de la membrana se mantiene libre de bloqueos por la fuerza del flujo de líquido que se mueve en paralelo a la superficie de la membrana.

Una membrana en espiral se compone de una serie de «sobres» de membrana con 2 láminas de membrana separadas por una malla espaciadora de permeado, cada una pegada a un tubo central de recolección de permeado.

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Entre cada par de envolturas hay un separador que crea el canal de alimentación, permitiendo que la alimentación fluya a lo largo de la membrana en espiral, mientras que el permeado que pasa a través de la membrana hacia la envoltura de la membrana fluye en un patrón en espiral hacia el tubo de recolección de permeado.

Rojo = Alimento/retenido.

Amarillo = Permeado.