This library entry contains background documents for a grant that Jianmin Wang is leading and which is funded by the Bill and Melinda Gates Foundation. Further information and a discussion is available on the SuSanA discussion Forum, see link below.: Goal(s): The goal of this project is to develop a high-efficiency biogas generator capable of producing the quantity of biogas and quality of effluent typical of advanced biogas generators, but without their inherent power or maintenance requirements. Objectives: (a) to develop a mixing device that uses the biogas generated from the lower portion of the biogas generator to automatically mix the generator content, without external energy input and mechanical moving parts; (b) to preliminary test the performance improvement of the biogas generator that integrates the self-mixing capability with the conventional biogas generators. How does it work? Overall, I have a mixing device within the reactor. This device collects gas bubbles from the lower portion of the tank. At a certain gas volume, the entire amount of the gas is released all together, creating a suction from the tank bottom and mixing the reactor. It uses the lifting power of the biogas bubbles created within the reactor therefore it does not need external power to drive it. Also, it does not have any mechanical moving parts, and all function is accomplished hydraulically. Therefore it is expected to be maintenance-free. Possible applications: We intend to use this unit for family use to replace old, large non-mixing digesters, because the old systems are so large that they have to be built on-site with causes lots of issues. Since our self-mixing units are small we can fabricate them in a central location to reduce cost and improve product quality. Authors: Canter, T., Wang, J., Atkinson, M +++++++++++ Documents available for download below: 1 - Poster at RTTC Fair in Seattle (Aug. 2012) 2 - Self-mixing biogas generator (presentation at FSM2 Conference in Durban, South Africa, Oct. 2012) 3 - Self-mixing biogas generator (poster at RTTC Toilet Fair in Seattle, Aug. 2012)

Bibliographic information

Wang, J. (2013). Biogas generator powered by self-sustaining mixing mechanism Various documents on results from research grant Frontier Environmental Technology, Rolla, Missouri, USA

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Biogas systems Fundamental research and engineeringEnglish

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