To cope with this problem, some non-edible plant oils have been
investigated, such as kusum (Schleichera triguga), mahua (Madhuca
indica) and rubber seed oil [2e4]. But most of those plants require
special growth conditions, a long cycle and large area of land, and
more importantly, the yield of those oil seeds mainly depends on
climate. Moreover, efforts have been made to obtain cheaper
feedstock from solid organic waste. Lipomyces starkeyi can live on
and convert sewage sludge into lipids, but a pretreatment of the
sludge with alkaline or acid hydrolysis is required, which is highly
energy-consuming and less environmental friendly [5]. Some potential
feedstock from waste lipids such as waste cooking oil and
rice bran oil have been investigated for biodiesel production, too
[6,7], but the information is scarce on using those materials to
produce biodiesel on an industrial scale