Abstract
The shortage of fossil fuel can be minimized by developing renewable energies such as biogas. The raw material of biogas can be derived from corn stover. Biogas was produced under solid-state anaerobic digestion (SS-AD) and liquid anaerobic digestion (L-AD). The objectives of this study were to compare the biogas yield and analyze the pH value and VS degradation. The results reported that the SS-AD generated a higher biogas yield than L-AD. SS-AD could improve the biogas yield of 71%. Both SS-AD and L-AD had a higher final pH than the initial pH. Moreover, the VS degradation was proportionate to the biogas yield. The highest VS reduction was achieved on SS-AD. Keywords: anaerobic digestion, biogas, liquid state, solid state, volatile solid, renewable energy
Highlights
The use of energy from fossil fuel increases continuously, on the contrary, the conventional resources deplete gradually
The results reported that the solid-state anaerobic digestion (SS-anaerobic digestion (AD)) generated a higher biogas yield than liquid anaerobic digestion (L-AD)
Volatile solid is associated with organic material that is digested by microbes into biogas
Summary
The use of energy from fossil fuel increases continuously, on the contrary, the conventional resources deplete gradually. The anaerobic digestion (AD) decomposes organic materials into biogas as renewable energy. Biogas can be utilized as heat and electricity, transportation fuel and digestate for biofertilizer manufacture [4]. Crops have been mainly used as a lignocellulosic biomass feedstock for biogas production through AD in the current year [5]. The SS-AD has several benefits, e.g. smaller reactor, no need for stirring, higher methane productivity and less water consumption. L-AD is simple to control, steady operation stages and produces in high methane production, but some disadvantages are found on L-AD, for example, larger digester, exaggerated energy through mixing and larger water consumption [10]. The previous studies on biogas production from corn stover have been completed before. No study has been investigated to produce biogas from corn stover by L-AD and SS-AD. The pH and VS reduction were observed during the digestion
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