A cavitation device is used to heat and facilitation the separation of
mixtures and emulsions of oil and water. Waste heat from the power source
for the cavitation device may be utilized to elevate the temperature of
incoming mixtures or emulsions. The heated mixture of emulsion is sent to
a separation vessel where vapor may be removed and/or recovered, and
where oil is removed as it separates into an identifiable layer. The
separation vessel may be a flash tank.