Abstract
The feasibility of using fat, oil and grease (FOG), a typical waste discarded from wastewater treatment plants, as substrate for anaerobic digestion with various enzyme treatments was investigated using series of biochemical methane potential (BMP) tests. The ranges of an ideal substrate to inoculum (S/I) ratio were determined for FOG (0.25, 0.5 and 1%) with various pre-treatments. The results indicate an increased biogas production with both detergent enzyme formulation and enzyme alone (‘Gelzyme’ and lipase). The ideal inoculum to substrate concentration for both treatments was found to be 0.25% beyond which LCFA toxicity was encountered. In the case of ‘Gelzyme’ treatment, the maximum biogas production was observed at 0.25% substrate concentration and 0.25% ‘Gelzyme’ treatment for 6 h (389 ml/gTS). With lipase treatment, the optimum inoculum to substrate ratio was also found to be 0.25% with a lipase concentration of 0.5% and treatment time of 24 h (892 ml biogas/gTS) which accounts for 85.5% of the theoretical biogas yield from lipids. Of the two enzyme pre-treatments studied, lipase was found to give higher gas yields.
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Malayil, S., Chanakya, H.N. (2020). Biogas Production from Fat, Oil and Grease and Effect of Pre-treatment. In: Ghosh, S., Sen, R., Chanakya, H., Pariatamby, A. (eds) Bioresource Utilization and Bioprocess. Springer, Singapore. https://doi.org/10.1007/978-981-15-1607-8_7
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DOI: https://doi.org/10.1007/978-981-15-1607-8_7
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