Throughout the metal-working industry, cutting-oil emulsions are used as lubricants and coolants. However, they have to be discarded after a certain time due to losing their functional properties. Hence, they need to be treated in order to separate any oil before disposal. Conventional methods have their advantages, but none are effective enough. Therefore, membrane technology appears to be a promising alternative. The aim of this work was to study the membrane treatment of spent metal-working fluids. The main drawback of membranes is flux decline due to fouling and concentration–polarization. The complexes of cutting-oils containing membrane filtration systems demand complementary studies on issues relating to fouling control and its reduction and membrane cleaning after fouling. Important conclusions were therefore formed about achievements in the field of fouling control and membrane cleaning.
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Milić et al. (2013) studied this question.
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