Effect of the geometry of the digester mixer on biogas production

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Buğutekin A., Yılmaz M., Binark A. K.

FUTURE ENERGY SOURCES , cilt.1, ss.133-150, 2009 (Hakemli Dergi)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 1
• Basım Tarihi: 2009
• Dergi Adı: FUTURE ENERGY SOURCES
• Sayfa Sayıları: ss.133-150
• Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
• Marmara Üniversitesi Adresli: Evet

Özet

Power need, increased with improved technology and population, made renewable

resources much more important. One of these renewable energy resources is produced by

processing waste product. There are many parameters (type of waste product, temperature,

mixing, pH, waiting time, etc.) affecting the performance of biogas production. One of the

important parameters is the waste product mixing. In this work, biogas production to become

conditioned, providing boundary conditions of biogas production was built in the laboratories

of the Technical Education Faculty of Marmara University. Effect of mixing on biogas

production was investigated. As a mixing system, a magnetic mechanic mixing system having

the properties of 2 min/h and 30 rev/min was selected. Three different type mixers, without

mixing (F1), T profile blade type mixer (F2), 6 blade Rushton mixer (F3) also modeled by Star-

CCM+ software were used for CFD analysis. Some amount of cattle waste was put into

digesters and those digesters were stored in biogas to become conditioned at same conditions

for 45 days and 309 K at each 24 hour period, amount of biogas production, methane

percentage and pH values were measured and graphs of these data were evaluated. Results of

experiments show that digester (F3) having Rushton mixer more efficient (about 30 %) than

digester (F1) without mixing and was more efficient (about 15.4%) than digester (F2) having T

profile blade type mixer. Also, it was observed that T profile blade type mixer was more

efficient (about 16.6 %) than digester (F1).