To simplify the procedure of biogas production using agricultural straw as raw materials, the biogas performance of both dry and fresh rice straw (RS) was assessed during batch anaerobic digestion (AD) at 35 °C. The results showed that biogas production from fresh RS was 400.5 mL/g volatile solids (VS), which was 40.9% larger than that from dry RS substrate. Meanwhile, the methane content in biogas from fresh RS was 56.05% (approximately 2.5% larger than for dry RS), and the VS removal rate from feedstock was 72% (which was 7.2% greater than for the dry RS substrate). Moreover, the scum volume resulting from digestion of dry RS was 3.16 times the volume from fresh RS at the end of AD, indicating that RS feedstock in a fresh state was more readily biodegradable and more easily used as a substrate by microorganisms. Therefore, compared with dry RS, fresh RS as AD feedstock has practical application value and should be included in further research on the AD of biomass resources.

中文翻译：

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厌氧消化法评估新鲜稻草和干稻草的沼气潜力

为了简化以农业秸秆为原料生产沼气的过程，在35°C的批量厌氧消化（AD）过程中评估了干稻秸秆和新鲜稻秸秆（RS）的沼气性能。结果表明，新鲜RS产生的沼气为400.5 mL / g挥发性固体（VS），比干燥RS底物产生的沼气大40.9％。同时，新鲜的RS中沼气中的甲烷含量为56.05％（比干燥的RS中约高2.5％），原料中VS去除率为72％（比干燥的RS底物中高7.2％）。此外，干RS消化产生的浮渣体积是AD末新鲜RS体积的3.16倍，表明处于新鲜状态的RS原料更易于生物降解，更易于被微生物用作底物。因此，与干式RS相比，