Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Kjølnes Ring 56, NO-3918 Porsgrunn, Norway.
Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Kjølnes Ring 56, NO-3918 Porsgrunn, Norway.
Bioresour Technol. 2021 Jul;332:125068. doi: 10.1016/j.biortech.2021.125068. Epub 2021 Apr 1.
Hydrothermal pretreatment (HTP) (Hot water extraction (HWE) and steam pretreatment) and pyrolysis have the potential to liquefy lignocellulosic biomass. HTP produces hydrolysate, consisting mainly of solubilized hemicellulose, while pyrolysis produces aqueous pyrolysis liquid (APL). The liquid products, either as main products or by-product, can be used as anaerobic digestion (AD) feeds, overcoming shortcomings of solid-state AD (SS-AD). This paper reviews HWE, steam pretreatment, and pyrolysis pretreatment methods used to liquefy lignocellulosic biomass, AD of liquefied products, effects of inhibition from intermediate by-products such as furan and phenolic compounds, and pretreatment tuning to increase methane yield. HTP, focusing on methane production, produces less inhibitory compounds when carried out at moderate temperatures. APL is a challenging feed for AD due to its complexity, including various inhibitory substances. Pre-treatment of biomass before pyrolysis, adaptation of microorganism to inhibitors, and additives, such as biochar, may help the AD cultures cope with inhibitors in APL.
水热预处理 (HTP)（热水提取 (HWE) 和蒸汽预处理）和热解有可能使木质纤维素生物质液化。HTP 产生水解产物，主要由溶解的半纤维素组成，而热解产生水热解液体 (APL)。液体产物无论是主要产物还是副产物，都可以用作厌氧消化 (AD) 的饲料，克服固态 AD (SS-AD) 的缺点。本文综述了用于液化木质纤维素生物质的 HWE、蒸汽预处理和热解预处理方法、液化产物的 AD、糠醛和酚类化合物等中间副产物的抑制作用以及提高甲烷产量的预处理调整。HTP 侧重于甲烷生产，在中等温度下进行时产生的抑制性化合物较少。APL 是一种具有挑战性的 AD 饲料，因为它的复杂性包括各种抑制物质。在热解前对生物质进行预处理、微生物对抑制剂的适应以及添加生物炭等添加剂，可能有助于 AD 培养物应对 APL 中的抑制剂。
