The complex chemical and structural arrangement of lignocellulosic biomass demand a pretreatment step to dismantle its coherent nature. The current study was designed to study H₂SO₄ impregnation before hydrothermal pretreatment (HP) of sugarcane bagasse for biogas production using response surface methodology based on defining factors: temperature (160, 180, 200 °C), time (5, 12, 19 min), and H₂SO₄ concentration (1, 2, 3% w/v). The H₂SO₄ impregnation had a paramount impact in combination with temperature and treatment time parameters. The lowest solid yield 12.3% was recorded in pretreatment run A-HSO (200 °C, 19 min, 3% H₂SO₄), up to 100% xylan removal was noted in four pretreatment runs (A-HSO; 200 °C, 19 min, 3% H₂SO₄, B-HSO; 200 °C, 19 min, 1% H₂SO₄, C-HSO; 200 °C, 5 min, 3% H₂SO₄, and O-HSO; 213.6 °C, 12 min, 2% H₂SO₄), maximum klason lignin increase in insoluble solid fraction (ISF) verified was 358.85% in pretreatment run O-HSO at 213.6 °C, while glucan content reduction (33.18–74.14%) was also observed in pretreatment runs A-HSO, C-HSO, and O-HSO. Results verified maximum methane recovery of 160.16 NmL (g TVS)⁻¹ in pretreatment run I-SHO (180 °C, 12 min, 2% H₂SO₄). Microbial community analysis observed the predominance of Flavobacterium and Desulfosporosinus genera of Bacterial domain and Methanolinea of Archaea domain. H₂SO₄ impregnation before HP though not suitable for methane production from ISF could be employed in a biorefinery perspective to obtain valuables (chemicals and fuels) due to the production of organic acids rich liquid stream and lignin-rich solid fraction.

Graphical Abstract

中文翻译：

---

硫酸辅助甘蔗渣水热预处理及微生物群落结构的甲烷生产

木质纤维素生物质的复杂化学和结构布置需要预处理步骤以消除其连贯性。本研究旨在使用响应面方法，根据以下定义因素，对甘蔗渣水热预处理（HP）进行H ₂ SO ₄浸渍以生产沼气进行研究：确定温度，温度（160、180、200°C），时间（5、12、12） 19分钟）和H ₂ SO ₄浓度（1、2、3％w / v）。H ₂ SO _4的浸渍对温度和处理时间参数的影响最大。预处理运行A-HSO（200°C，19分钟，3％H ₂ SO ₄）记录的最低固体收率12.3％），在四个预处理运行中（A-HSO; 200°C，19分钟，3％H ₂ SO ₄，B-HSO; 200°C，19分钟，1％H ₂ SO ₄）记录了高达100％的木聚糖去除率，C-HSO; 200°C，5分钟，3％H ₂ SO ₄和O-HSO; 213.6°C，12分钟，2％H ₂ SO ₄），不溶性固体部分（ISF）的最大Klason木质素增加经验证，在213.6°C的预处理运行O-HSO中为358.85％，而在预处理运行A-HSO，C-HSO和O-HSO中还观察到葡聚糖含量降低（33.18–74.14％）。结果证实了在预处理运行I-SHO（180°C，12 min，2％H ₂ SO ₄）中的最大甲烷回收率为160.16 NmL（g TVS）^-1）。微生物群落分析观察到细菌区域的黄杆菌和脱硫孢子属以及古细菌的甲醇属占优势。HP之前的H ₂ SO ₄浸渍虽然不适合ISF的甲烷生产，但由于产生了富含有机酸的液流和富含木质素的固体馏分，因此可以用于生物精炼的观点，以获得有价值的物品（化学品和燃料）。

图形概要