THE USE OF ULTRASONIC TO INCREASE THE EFFICIENCY OF OIL EXTRACTION FOR MICROALGAE INDIGENOUS ISOLATES FROM POND GRESIK, EAST JAVA

Abstract

The prospect of microalgae biomass as a biodiesel is as a
renewable energy. The microalgae biomass is aimed to
substitute the petroleum. The identification of
microalgae was conducted on twice which was derived
from Gresik ponds consist of 29 species. On the other
hand, there were 10 species which were resulted from
laboratory test of Biology, Science Faculty, UM. Among
the isolated, there are 2 species that faster growth
rate, Chlorella vulgaris and Spirogyra sp. Generally,
extraction of oil from microalgae biomass requires a
long time. The aims from the research are to examine
three methods of oil extraction from the two species of
microalgae, the experimental laboratory techniques.
Biomass of microalgae dry powder was extracted using
the solvent n- hexane by three methods, Soxhlet,
maceration and ultrasonic waves. On the acquisition of
microalgae oil the yield equivalent, compared with
extraction time from the three methods. The smaller time
of microalgae oil extraction is the more efficient
extraction. The results showed: (1) the use of ultrasonic
waves can improve the efficiency of microalgae oil
extraction. (2) The yield of algae oil which is extracted
using the method Soxhlet, maceration, and extraction
with the aid of ultrasonic waves in a row is 1.58%,
1.03%, and 1.77% by the time it takes for 18 hours, 8
hours, and 2.33 hours.