NOVELTY - Biodiesel production plant, comprises: a raw materials preparation unit receiving and processing at least one raw material source comprising an average of at least 0.5 wt.% of free fatty acids in total oil; an acid-enhanced solvency and expression-based extractor and in situ reactor (16) unit receiving the raw material source from the raw materials preparation unit and converting the free fatty acids and other reactive lipids in the raw material source to the fatty acid ethyl ester product by acid catalysis and base catalysis with ethanol; an ethanol and catalyst preparation unit.    USE - The biodiesel production plant is useful for producing a biodiesel product comprising a fatty acid ethyl ester product (claimed).    ADVANTAGE - The biodiesel production plant provides a strategic positioning in the biodiesel business that is economically feasible without governmental subsidies, which is preferably done using scattered small plants to produce 3 million gallons of biodiesel per year close to vegetable oil sources, thus minimizing raw material logistical costs as well as produces byproduct such as chemically-enhanced organic fertilizer.    DETAILED DESCRIPTION - Biodiesel production plant, comprises: a raw materials preparation unit receiving and processing at least one raw material source comprising an average of at least 0.5 wt.% of free fatty acids in total oil; an acid-enhanced solvency and expression-based extractor and in situ reactor (16) unit receiving the raw material source from the raw materials preparation unit and converting the free fatty acids and other reactive lipids in the raw material source to the fatty acid ethyl ester product by acid catalysis and base catalysis with ethanol; an ethanol and catalyst preparation unit supplying ethanol, acid catalyst, and base catalyst to the acid-enhanced solvency and expression-based extractor and in situ reactor unit; and a separation and refining unit receiving a liquid stream comprising the fatty acid ethyl ester product and glycerin from the acid-enhanced solvency and expression-based extractor and in situ reactor unit and separating the fatty acid ethyl ester product from the glycerin and impurities in the liquid stream.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram summary of first half and second half of apparatus of a biodiesel production.    Anhydrous ethanol tank (11)    Concentrated sulfuric acid tank (12)    Acid-enhanced solvency and expression-based extractor and in situ reactor (16)    Piston-cylinder reactors (18, 19)    Cake breaker (22)