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Performance of a highly reliable 4-chamber small scale biogas reactor

Anaerobic digestion and biogas production is becoming an important source of alternative energy where both agricultural and domestic wastes may be utilised in a meaningful way. The present project has been initiated for promotion of biogas technology in agriculture in particular for increasing economic feasibility also for small operations.

In case of agricultural wastes a priori knowledge about the influent characterisation is a major issue for plant design. As a basis for further development, we investigated a 4-chamber biogas plant that has been in operation for more than 40 years. Co-fermentation under field conditions was observed, quality data and flow data were recorded and mass flow balances were calculated. In the lab different substrates were digested under controlled conditions. We then technologically developed this 4-chamber approach and designed a new reactor type based on modelling. The obtained model was applied to the comparison of different reactor configurations and volume partitions. An optimisation objective was robustness and load flexibility, i.e. the same reactor type should easily adapt to different load situations by a simple recycle control. What we got is a reactor with two concentric rings, partitioned into 4 chambers that allow a biogas yield of 600 m 3 biogas per day, or, in other terms, up to 50 kW electrical power and 100 kW heat capacity.

Copyright:	© IWWG International Waste Working Group
Quelle:	Venice Conference 2006 (November 2006)
Seiten:	6
Preis:	€ 0,00
Autor:	Dipl.-Ing. Dr. techn. Bernhard Wett M. Schoen P. Phothilangka F. Wackerle H. Insam
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