Abstract
To enhance the codigestion of degradation and improve biomethane production potential, sugarcane bagasse and filter mud were pretreated by sodium hydroxide NaOH 1 N at 100°C for 15, 30, and 45 minutes, respectively. Biomethane generation from 1-liter batch reactor was studied at mesophilic temperature (37 ± 1)°C, solid concentrations of 6%, and five levels of mixing proportion with and without pretreatment. The results demonstrate that codigestion of filter mud with bagasse produces more biomethane than fermentation of filter mud as single substrate; even codigested substrate composition presented a better balance of nutrients (C/N ratio of 24.70) when codigestion ratio between filter mud and bagasse was 25 : 75 in comparison to filter mud as single substrate (C/N ratio 9.68). All the pretreatments tested led to solubilization of the organic matter, with a maximum lignin reduction of 86.27% and cumulative yield of biomethane (195.8 mL·gVS−1, digestion of pretreated bagasse as single substrate) obtained after 45 minutes of cooking by NaOH 1 N at 100°C. Under this pretreatment condition, significant increase in cumulative methane yield was observed (126.2 mL·gVS−1) at codigestion ratio of 25 : 75 between filter mud and bagasse by increase of 81.20% from untreated composition.
Highlights
Energy plays an important role in the national security of any given country as a fuel to power the economic engine
The total solid in the samples varied from 58.9% for bagasse and 47.85% for the filter mud
Pretreatment by cooking the substrates at 100∘C with NaOH 1 N for 45 minutes has a higher cumulative biomethane yield in all levels of codigestion compared to other pretreatment times and to untreated groups
Summary
Energy plays an important role in the national security of any given country as a fuel to power the economic engine. It is convenient to use oil, coal, and natural gas for our energy needs, but they are limited and by continuous and rapid use they will run out. They increase greenhouse gases emission into atmosphere which causes the trapping of sun’s heat and contributing to global warming [1, 2]. Considerable amount of waste byproduct materials is being generated through agricultural practices, mainly from various agrobased industries. Agroindustrial biomass such as sugar industry waste is an inexpensive, renewable, abundant, and rich-in-energy potential. Much of the biomass is often disposed of by burning, which is not restricted to developing countries alone [5]
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