NOVELTY - The system comprises an esterification reactor, a transesterification reactor present in communication with the esterification reactor, a preliminary processing unit present in communication with the esterification reactor and/or the transesterification reactor, a control system present in communication with the esterification reactor, the transesterification reactor and the preliminary processing unit, and a biodiesel processing unit present in communication with the esterification reactor and/or the transesterification reactor. The biodiesel processing unit comprises a settlement tank.    USE - The system is useful for converting a lipid feedstock to a biodiesel fuel meeting the ASTMD6751-10 specification, where the biodiesel fuel is useful in engines, power trains, ships, large trucks and other vehicles and the feedstocks include glycerides, recovered lipids and lipid material such as fats, oils, fatty acids and glycerides from a plant or vegetable such as sunflower, soy and rape or an animal including e.g. cows.    ADVANTAGE - The system is capable of efficiently converting the liquid feedstock to the biodiesel fuel without any waste.    DETAILED DESCRIPTION - The system comprises an esterification reactor, a transesterification reactor present in communication with the esterification reactor, a preliminary processing unit present in communication with the esterification reactor and/or the transesterification reactor, a control system present in communication with the esterification reactor, the transesterification reactor and the preliminary processing unit, and a biodiesel processing unit present in communication with the esterification reactor and/or the transesterification reactor. The biodiesel processing unit comprises a settlement tank, a reboiled stripping unit, an inert gas stripping unit, a physical absorption unit, a water washing unit, and/or an ion exchange unit. The esterification reactor comprises a reactive distillation esterification reactor, and a solid heterogeneous catalyst containing a chemical group. The preliminary processing unit consists of a pre-treatment unit, a fatty acid stripper, and a fatty acid distillation unit. The pre-treatment unit consists of an acid degumming unit, a dry degumming unit, a bleaching unit, a silica filtration unit, a water degumming unit, and a super degumming unit. The control system is adapted to optimize a process parameter, and optimizes a process parameter through selection of a feedstock-dependent process route, where the process parameter is throughput. An INDEPENDENT CLAIM is included for a method for manufacturing biodiesel from a feedstock comprising an amount of free fatty acids, an amount of glycerides and an amount of contaminants.    DESCRIPTION OF DRAWING(S) - The diagram shows a flow diagram of a process for fatty acid alkyl esters production.    Pre-treatment step (25)    Fatty acid stripping (45)    Fatty acid distillation (80)    Esterification step (95)    Biodiesel processing step. (110)