Process of preseco agri biogas plant

Raw slurry is fed into the holding tank acting as a buffer for feeding the digester tanks with biomass. From there, the biomass is pumped into digester tanks and further on to storage tanks. To keep the waste mass homogenous, and to avoid the formation of a scum layer, the mass is continuously mixed and stirred throughout the process. This agitation also prevents swimming layers or sedimentation inside the system. Nutrients or additives can be added to the process at some points, if bacteria and waste require this.

Waste is fed into the system continuously, several times a day in small quantities, as old material is removed. The normal biodigestion period is between 20 to 50 days, and pumping the waste is an automated, timed process. The reactor is a completely gas-tight system, from which the gas is formed and collected for further use.

All tanks in biogas plants must be insulated for proper operation during cold periods. Since the tanks may also require heating, a heating system must be installed to achieve an optimal temperature for the biology.

A computer system monitors the whole process and all operations are executed automatically, based on a preprogrammed procedure. The system stores parameters, as well as displays them as time-series, and has remote alarm and control options.