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The objective of the Computer Controlled Anaerobic Digester, "PDANC", designed by EDIBON, is to study and understand the stages of the anaerobic digestion, as well as the anaerobic digestion process itself. It is supplied with two packed anaerobic digesters. In this way, the user can work either in only one stage or in two stages, separating the different phases of the digestion process (the processes of hydrolysis, acidogenesis and acetogenesis would take place in the first digester, and the methanogenesis in the second digester). Both digesters have a heating water circuit with valves to regulate the appropriate temperature in each part of the process and the operation with different ranges depending on the microorganisms used. Thus, it can operate at the psychrophilic range (room temperature), mesophilic range (temperatures around 35 °C) or thermophilic range (temperatures around 55 °C). The heating system of the digesters consists in making hot water from a computer controlled thermostatic bath flow through the jacket of the reactor. The unit has two computer controlled peristaltic pumps to impel the supply to be introduced in the digesters. When working with a two-stage anae