Do biodigesters smell?

Biodigesters have a mild smell, like a compost pile, but it is not offensive. You can use a small bucket to cover your feed tube to limit wafting smells, and the new HomeBiogas systems have a plunger that seals the feed tube when not in use. Similarly, regularly emptying your fertilizer bucket or piping it away for steady use will also reduce odors. In general, it’s good to site your biodigester 20-30’ away from your kitchen.