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Process optimization of biogas energy production from cow dung with alkali pre-treated coffee pulp

Abstract

Biogas production from cow dung with co-substrate agricultural waste is one of the most demanding technologies for generating energy in a sustainable approach considering eco-friendly. In the present study, coffee pulp (CP) was pre-treated with 1% NaOH and combined with various proportions of cow dung (CD) to explore its biogas producing potentiality. The optimization of the process was studied using Response surface methodology. Statistics based on 3-D plots were generated to evaluate the changes in the response surface and to understand the relationship between the biogas yield and other parameters. The highest methane production (144 mL/kg) was achieved after 90 h of incubation with 1:3 of CP and CD at 40 °C. Gas chromatography analyzes the chemical compositions of the generated biogas and its post combustion emissions. The chemical composition of the substrates before digestion and after fermentation (biogas spent sludge) were measured in terms of fiber content and the values were noted as, total solids (0.53%), ash content (9.2%), volatile fatty acid (100 mg/L), organic carbon (46%) and a total carbohydrate (179 mg/g). The results of the optimization of biogas production presented in this work found to have significance with the process parameters. The outcome of the study has supported the fact of conventional combustion technology that has to be upgraded to prevent these hazardous emissions into the atmosphere.

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Correspondence to T. Selvankumar or M. Govarthanan.

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Selvankumar, T., Sudhakar, C., Govindaraju, M. et al. Process optimization of biogas energy production from cow dung with alkali pre-treated coffee pulp. 3 Biotech 7, 254 (2017). https://doi.org/10.1007/s13205-017-0884-5

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  • DOI: https://doi.org/10.1007/s13205-017-0884-5

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