NOVELTY - Process (I) for deodorizing a grease waste mixture, comprises contacting a grease waste mixture with source of steam at 100-160 degrees C and/or with an oxidizing agent, so that the grease waste mixture has a substantially reduced odor.    USE - The processes are useful for: deodorizing a grease waste mixture; reclaiming brown grease from a source of brown grease; reducing the levels of sulfur and free fatty acids in a crude biodiesel solution; and preparing a biodiesel solution from a lipid mixture comprising brown grease (all claimed).    ADVANTAGE - The processes: allow for rapid and efficient recovery or reclamation of brown grease from their sources; and provides biodiesel solution having reduced levels of sulfur and free fatty acids.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) simultaneously transporting and heating a source of brown grease, comprising (a1) passing the source of brown grease through a metal pipeline that is heated with a flame at 25-95 degrees C so that the source of brown grease has a dynamic viscosity of 1.002x 10-3-3.15x 10-4 NS/m2;    (2) a process (II) for reclaiming brown grease from a source of brown grease, comprising: (a1) as above per se, where the source of brown grease comprises lipid component, aqueous component, and solid component; and (a2) separating the lipid component from the aqueous and solid components in the source of brown grease, where the separated lipid component comprises the reclaimed brown grease;    (3) a process (III) for reducing the levels of sulfur and free fatty acids in a crude biodiesel solution, comprising: (a3) contacting the crude biodiesel solution with an insoluble base to form a treated biodiesel solution comprising at least one sulfur-insoluble base adduct and at least one free fatty acid insoluble based adduct; and (a4) removing the sulfur-insoluble and free fatty acid-insoluble base adducts from the treated biodiesel solution to generate a biodiesel solution having reduced levels of sulfur and free fatty acids; and    (4) a process (IV) for preparing a biodiesel solution from a lipid mixture containing brown grease, comprising: (a5) contacting the lipid mixture with an alcohol in the presence of an esterification catalyst to form a crude biodiesel solution; and (a3) as above per se.