IN VESSEL COMPOSTING SYSTEM FOR ACCELERATED COMPOSTING The BioReactor is an in vessel composting system that allows you to rapidly compost solid organic waste from restaurants, grocery stores, households, factories, processing plants, farms, municipalities, universities, hospitals and so on (if it is solid and organic, it can be composted!) The BioReactor rotating drum composter can compost huge volumes of solid waste in just 4 to 7 days. This in vessel composting technology offers a complete “green” solution that can provide better-than-average Return on Investment.