This is a very particular machine. It is a Bioreactor, which means that there is a biological phase in it. Normally we work with microorganism via anaerobic fermentation to produce, out of diverse organic matter (sometimes waste materials), useful products. This machine has different mechanical parts, which enables it to work properly, but the real core of the reactor are the living cells. Typical reactors in chemical engineering take advantage of different driving forces to function, but in this reactor the engine is constituted by a group of microorganism (which are perfect machines themselves) obtaining an outstanding performance.