Optimization of Biogas Production from Co-digestion of Livestock Manure and Pumpkin Waste using the Response Surface Methodology (RSM)

Document Type : Research Paper

Authors

Department of Biosystems Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran

Abstract

Abstract
Disposal of agricultural waste and livestock manure in the environment can cause pollution. Annually, a very large volume of animal waste and various types of agricultural wastes is produced, which could be considered as a potential for biogas production. Such an energy production causes proper disposal of waste and reduce pollution. Therefore, in this study, biogas production from the combination of livestock manure and pumpkin waste was investigated. Pumpkin is produced solely to extract its seeds and most of the product is useless and disposed of as waste. The experiments were performed using three ratios of pumpkin waste to cow manure (10:90, 20:80, 30:70) at two different concentrations (1:1 and 1:2 combination of the waste with water) in 1 liter batch reactors. To optimize the process, the response surface methodology (RSM) and full factorial experiment in three replications were used. Design Expert 12 software was used to analyze the experimental data. The results showed that the effect of waste concentration on the amount of produced biogas and the effect of composition ratio are significant at the level of 1% and 5% probability, respectively, but their interaction is not significant. The relationship between biogas production with feed concentration variables and composition ratios was presented in the form of a regression equation. The ratio of 10:90 and the feed concentration with the ratio of 1:2 were determined as the optimal feed, which lead to the maximum production of biogas at the amount of 93.5267 ml/day.
 

Keywords

References

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Agricultural Mechanization
Volume 5, Issue 1
March 2021
Pages 101-93

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  • Receive Date: 09 June 2021
  • Accept Date: 09 June 2021

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