The disclosed invention is an improved method for treating ethanol distillation still bottoms by recovering, through solids separation and pressurized membrane filtration, pure water from still bottoms for human consumption or reuse, and concentrating the solids with beneficial properties recovered before anaerobic digestion. The invention is an improved process because it can reduce the volume of solids to manage, recovers the water from the fermentation still bottoms while pasteurized, maintains the chemical and physical properties of solids for beneficial property recovery, improves ethanol and energy efficiency, and results in clean discharge to the environment including carbon dioxide recovery. A bioreactor produces a gas rich in methane fuel from the concentrate to power the pressurized filtration process and an aqueous ammonia solution to recover or recycle. This invention improves environmental quality, conserves energy, and produces a beverage water for bottling that can be of an organic origin with reliable source and quality.