NOVELTY - Process for treating a glycerol solution containing fatty acid soaps comprises: acidifying the glycerol solution with an acid to produce free fatty acids and salt; removing the free fatty acids from the glycerol solution; separating an aqueous salt solution from the glycerol solution by electrodialysis; and, electrolytically splitting the salt component of the aqueous salt solution in a water splitting cell, thus producing a depleted salt solution, a recovered acid solution and a recovered base solution.    USE - The process is useful for treating a glycerol solution containing fatty acid soaps, for producing a depleted salt solution, a recovered acid solution and a recovered base solution, which is useful as a catalyst in biodiesel synthesis. The process is useful for producing esters and recovering and reusing a base catalyst and a neutralizing acid in biodiesel production (all claimed).    ADVANTAGE - The process reduces or eliminates the salt contaminant in the crude glycerol process stream with little or no loss of glycerol and without producing a waste salt solution.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a process for producing esters comprising: producing an ester-rich phase and a glycerol-rich phase comprising fatty acid soaps by combining an oil feedstock, an alcohol, and a homogeneous catalyst; separating the ester-rich phase from the glycerol-rich phase; and converting the fatty acid soaps to free fatty acids by contacting the glycerol-rich phase with a recovered acid solution;    (2) a process for recovering and reusing a base catalyst and a neutralizing acid in biodiesel production, comprising: transesterifying oil feedstock with at least one alcohol using a base catalyst, thus producing a biodiesel process stream and a glycerol-rich process stream comprising a fatty acid soap; acidifying the glycerol-rich process stream with an acid to form a salt, thus producing free fatty acids and a defatted glycerol-rich process stream containing the salt; electrodialyzing the defatted glycerol-rich process stream, thus separating an aqueous solution comprising the salt from the defatted glycerol-rich process stream; splitting the salt into component acid and base in a water splitting cell, producing a recovered acid and a recovered base; and, introducing the base in the transesterification of oil feedstock and contacting the acid with a glycerol-rich process stream; and    (3) a biodiesel apparatus, comprising: a biodiesel reactor; at least one electrodialysis apparatus fluidly connected to the biodiesel reactor; and at least one water splitting cell fluidly connected to the at least one electrodialysis apparatus and/or the biodiesel reactor.    DESCRIPTION OF DRAWING(S) - The flow chart shows a process for treating a glycerol solution containing fatty acid soaps.