Filtration by Means of Ceramic Membranes - Practical Examples from the Chemical and Food Industries

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Courtesy of atech innovations gmbh

Traditionally, ceramic membranes have been used in waste water engineering. Meanwhile, they are applied in all areas where media need to be filtered, such as in recycling processes in the chemical industry, for cell separation in biotechnology or for fruit-juice filtration in the food industry.

1 Introduction
Ceramic membranes based on aluminum oxide are an operationally reliable filter medium - in particular under extreme conditions - with an excellent chemical, thermal and mechanical strength that is matched by almost no other material. Consequently, membranes made by atech are primarily used when polymer membranes are no longer able to meet the requirements. Moreover, due to their high separation potential, membrane processes are considered an alternative option that in many cases is superior to traditional processes. For example, it is partly possible to specifically design the separating effect/property of membranes to suit specific applications. They are able under certain circumstances to separate desired or undesired substances/substance groups.

“Ceramic membranes based on aluminum oxide are an operationally reliable filter medium, in particular under extreme conditions.”

Traditionally, ceramic membranes have been used in waste water engineering. Meanwhile, they are applied in all areas where media need to be filtered, such as in recycling processes in the chemical industry, for cell separation in biotechnology or for fruit-juice filtration in the food industry. This document describes several examples from the chemical and food industries where ceramic membranes can make the most of their advantages as compared to products from competitors and where filtration processes are superior to other separation processes.

2 Ceramic membranes
The ceramic membranes made by atech (Fig. 1) are tubular composite membranes on an open porous carrier tube made of highpurity a-aluminum oxide. This tube is optimized for maximum water permeability and high mechanical stability (bursting strength >100 bar) and is coated on its inner side with a ceramic membrane. Then, it is subjected to a sintering process to form a monolithic combination.

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