Anaerobic Digestion
Before being in the tanks of digestion, the organic liquid is treated in a two-stage system pasteurizing:
- Heating from 30 to 60°C
- Heating from 60 to 72°C
The process consists in a thermal refurbishment of the product with the aim of eliminating any pathogenic organisms present heat-sensitive, such as bacteria in vegetative form with minimum alteration of chemical, physical and organoleptic characteristics of the biomass.
Our anaerobic digestion process is specifically designed to optimize, in qualitative and quantitative terms, the production yield of biogas.
The section of anaerobic digestion for production of biogas is constituted by:
- Primary digester;
- Secondary digester;
- Internal system of mixing of the raw material;
- Recirculation and control pumps.
The digesters are built above ground entirely of stainless steel (body and roof) to ensure a safe service life for at least 30 years and a simple and cheap maintenance. They are built in order to have sealed for both liquids and gases, which are completely recovered and used.
The shape coefficient of the digesters, which develop prevalently in height, allows effective stirring of the microbubbles of biogas, which date back upward, assisted by mixers with external inspection, installed externally to the digesters.
The mixing system adopted allows the total maintenance of the digesters exclusively from the outside, avoiding, in this way, their emptying in case of intervention. To avoid loss of important heat in the digesters, the insulation of the digester will occur with the use of a layer of rock wool of 15 cm. The digesters are heated by heat recovered from the cogenerator, from upgrading or by a natural gas boiler.
Central in the high efficiency operation of the plant is the redundant system pumping for recirculation and flow control which allows not to interrupt the process of digestion and biogas production even for the necessary routine maintenance and keep the production plant for over 8.500 hours/year.
The most competitive aspect of our patented Anaerobic Digestion technology are:
- Long expected life;
- High efficiency in biogas production;
- Maintenance low costs;
- Reliability;
- Low cost and easy management.