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Article

Optimization of Biogas Production in Dry Anaerobic Digestion of Swine Manure by the Use of Alkalinity Index to Monitor a Prototype Cylindrical Digester

1Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan

2Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan

3School of Biosystems and Environmental Engineering, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya


Sustainable Energy. 2017, Vol. 5 No. 1, 32-37
DOI: 10.12691/rse-5-1-5
Copyright © 2017 Science and Education Publishing

Cite this paper:
Ondiba Hesborn Andole, Zhongfang Lei, Zhenya Zhang, James Raude, Christopher Kanali. Optimization of Biogas Production in Dry Anaerobic Digestion of Swine Manure by the Use of Alkalinity Index to Monitor a Prototype Cylindrical Digester. Sustainable Energy. 2017; 5(1):32-37. doi: 10.12691/rse-5-1-5.

Correspondence to: Ondiba  Hesborn Andole, Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan. Email: hondiba@gmail.com

Abstract

Anaerobic digestion (AD) is one of the best alternative sustainable technologies for energy production and recovery from organic solid wastes. Up to now dry AD has been commercialized in the treatment of municipal solid wastes. Little information could be found on the practical application of dry AD to manure wastes or waste activated sludge. This study aimed at testing the feasibility of using alkalinity to manage dry AD system for swine manure treatment and clarify its effect on the stability and efficiency of the newly-developed prototype cylindrical digester system. A prototype cylindrical digester with a diameter of 40 mm and a volume of 1.3 liters was designed and fabricated. It was operated under mesophilic conditions (38C). The alkalinity of manure was increased by 3000 g/L (R1) and 6000 g/L (R2) by adding sodium bicarbonate with the raw swine manure as the control (R0). Results showed that R1 and R2 maintained a relatively higher level of alkalinity during the whole operation compared to the control (R0). Only one peak appeared in biogas production for the control reactor (R0) which almost ceased on day 12, whereas R1 and R2 exhibited two biogas peaks. The 30 days’ biogas yield for R2 was 276.6 ml/g-VSadded while R1 was 204.8 ml/g-VSadded which corresponds to an increase by 2.7- and 1.7- fold respectively as compared to the control (R0). 2.2- and 4.1-fold increase in methane production was achieved in R1 and R2 respectively as compared to R0. This difference is most probably attributable to the high alkalinity in R1 and R2 that stabilized the digestion process and minimized the influence of pH variations on methanogenesis.

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