The combination of carbon and nitrogen-rich co-substrates results in a better balance and increases the stability of the anaerobic co-digestion (AcoD) process. In this work, the AcoD process of waste from the leather industry (shavings and sludge) with waste from agriculture (oat straw) was assessed with regard to the energy (biogas production) and waste treatment efficiency (reduction of organic matter). The results indicate that the addition of untreated oat straw improved the AcoD process, increasing biogas production (25.44 mL of cumulative biogas/g of VSS added) by almost 60% when compared to the AcoD of only leather waste (16.17 mL/gVSS). Also, the effect of acid, alkaline, thermal, and the combination of these pretreatment techniques was evaluated on the lignocellulosic composition of oat straw and on methane yields. Pretreatments improved the characteristics and bioavailability of oat straw, particularly in methodologies that use alkali, with a significant increase in cellulose content accompanied by a decrease in hemicellulose and lignin content. However, the possible formation of secondary products or sterilization of important microorganisms did not reflect in a greater production of biogas: 21.06 mL/gVSS for oat straw pretreated only with HCl and 21.91 mL/gVSS for oat straw pretreated with HCl in autoclave; 5.20 mL/gVSS for oat straw pretreated with NaOH; and 3.43 mL/gVSS for oat straw pretreated with NaOH in autoclave; thermal pretreatment probably has generated toxic compounds from hemicellulose and cellulose degradation, which inhibited the AcoD process and, as consequence, virtually no biogas was produced.

碳和富含氮的共底物的组合导致更好的平衡并增加厌氧共消化 (AcoD) 过程的稳定性。在这项工作中，从能源（沼气生产）和废物处理效率（减少有机物）方面评估了皮革工业废物（刨花和污泥）与农业废物（燕麦秸秆）的 AcoD 工艺。结果表明，添加未经处理的燕麦秸秆改进了 AcoD 过程，与仅皮革废料的 AcoD（16.17 mL/gVSS）相比，沼气产量（25.44 mL 累积沼气/g VSS 添加）提高了近 60%。此外，还评估了酸、碱、热以及这些预处理技术的组合对燕麦秸秆木质纤维素成分和甲烷产量的影响。预处理改善了燕麦秸秆的特性和生物利用度，特别是在使用碱的方法中，纤维素含量显着增加，同时半纤维素和木质素含量降低。然而，副产物的可能形成或重要微生物的灭菌并没有反映在更高的沼气产量上：仅用 HCl 预处理的燕麦秸秆为 21.06 mL/gVSS，在高压釜中用 HCl 预处理的燕麦秸秆为 21.91 mL/gVSS；用 NaOH 预处理的燕麦秸秆为 5.20 mL/gVSS；在高压釜中用 NaOH 预处理的燕麦秸秆为 3.43 mL/gVSS；热预处理可能会从半纤维素和纤维素降解中产生有毒化合物，这抑制了 AcoD 过程，因此几乎没有产生沼气。