NOVELTY - Method (M1) of improving fermentation, involves heating stillage at 200-350 degrees F, removing several or all of a composition including suspended solids from the hydrothermally treated stillage, removing several or all of the dissolved solids from the hydrothermally treated stillage by a process including membranes, biological remediation, and anaerobic digestion, using all or a portion of the hydrothermally treated stillage as a component of a media, and using the media for a process chosen from fermentation and biomass production.    USE - The method (M1) is useful for improving fermentation for recovering metabolites, biomass, media, and hydrothermally treated stillage (all claimed) and improving water reuse, energy efficiency, fermentation and products of a fermentation plant.    ADVANTAGE - The method is cost-effective.    DETAILED DESCRIPTION - Method (M1) of improving fermentation, involves (a) heating stillage at 200-350 degrees F resulting in hydrothermally treated stillage, removing several or all of a composition chosen from suspended solids, dissolved solids, oil, proteins, fiber, and ash from the hydrothermally treated stillage, removing several or all of the dissolved solids from the hydrothermally treated stillage by a process chosen from membranes, biological remediation, anaerobic digestion, electro-dialysis, ion exchange, evaporation, gas-stripping, distillation, solvent extraction, and precipitation, using all or a portion of the hydrothermally treated stillage as a component of a media, and using the media for a process chosen from fermentation and biomass production, or (b) heating stillage at 200-350 degrees F resulting in hydrothermally treated stillage, removing from the hydrothermally treated stillage several or all of a composition chosen from suspended solids, dissolved solids, oil, proteins, fiber, and ash, adding one or more agents to assist in the removal of solids chosen from acids, bases, minerals, organic and inorganic flocculants, polymeric flocculants, microparticulate settling aids, precipitation aids, and salts, using all or a portion of the hydrothermally treated stillage as a component of a media, and using the media for a process chosen from fermentation and biomass production. INDEPENDENT CLAIMS are included for the following:    (1) metabolites recovered from the method;    (2) biomass recovered from the method;    (3) media recovered from the method;    (4) method (M2) of recovering oil from hydrothermally treated stillage, involves heating stillage at 200-350 degrees F and maintaining for 3-180 minutes resulting in hydrothermally treated stillage, concentrating the hydrothermally treated stillage by removing a portion of the water, and removing oil from the concentrated hydrothermally treated stillage;    (5) oil recovered by the method (M2);    (6) protein-containing solids fraction recovered by the method (M2);    (7) de-oiled stickwater concentrate recovered by the method (M2); and    (8) hydrothermally treated stillage.