Co-digestion between biomass and livestock waste increases methane production
by providing an optimal C/N ratio. Also, bio-pretreatment has received more
attention due to its effectiveness in biomass-derived material hydrolysis into
biodegradable carbohydrates. Rice straw (RS) is abundant in the Vietnamese
Mekong Delta (VMD), which potentially enhances biogas production from codigestion with pig manure (PM) in case of shortage of livestock waste for biogas
digesters. However, the high solid content of RS and its higher C/N ratio
generally results in the low productivity of biogas when used as sole substrate.
Therefore, we assessed the efficiency of biological pretreatment of RS on biogas
production through single-stage batch anaerobic digestion under mesophilic
conditions. The substrate ratio-based on volatile-solid (VS) rate was used at a 1:1
mixture (RS:PM) with a total concentration supplemented at 45 g-VS/L over a 60-
day batch digestion. The bio-solutions included de-chlorinated tap water (TW),
digester effluent (DE), ditch water (DW), and anoxic sediment (AS). ETC...