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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