BioEnergy Research ( IF 3.1 ) Pub Date : 2021-09-10 , DOI: 10.1007/s12155-021-10325-w Mariana Candia-Lomeli 1 , Aída Tapia-Rodríguez 1 , Elías Razo-Flores 1 , Lourdes B. Celis 1 , Marcia Morales-Ibarría 2
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Microalgae biomass can be a feedstock for anaerobic digestion, but the recalcitrance of the cell wall limits fully exploiting this source of organic matter. Alkaline pretreatments modify the structure of the cell wall facilitating bacterial attack and solubilizing the organic matter content. It is unknown whether alkaline hydrogen peroxide can help to improve biogas production from microalgae biomass compared to other alkaline pretreatments. This work focused on methane production at alkaline conditions (pH 9) with pretreated microalgal biomass (Scenedesmus obtusiusculus). Alkaline hydrogen peroxide (AHP) was used for the thermo-alkaline pretreatment and compared with pretreatments using NaOH or CaO. The pretreatment with 15% CaO solubilized the highest carbohydrates (22.1%) and proteins (18.3%), while the microalgal biomass pretreated with 4 M NaOH or 1.5% AHP attained the highest yields of methane (227.1 mL and 208.4 mL CH4/g VS, respectively), improving the methane potential between 34 and 46%, and producing biogas with methane content up to 91%. A preliminary techno-economic and energy analysis showed energy savings of 40% with 4 M NaOH and 31% with 1.5% AHP; therefore, AHP could be considered a suitable option for the pretreatment of microalgal biomass.
Graphical abstract
中文翻译：
热化学预处理微藻生物质在碱性条件下的厌氧消化
微藻生物质可以作为厌氧消化的原料，但细胞壁的顽固性限制了充分利用这种有机物质来源。碱性预处理会改变细胞壁的结构，促进细菌攻击并溶解有机物含量。与其他碱性预处理相比，碱性过氧化氢是否有助于提高微藻生物质的沼气产量尚不清楚。这项工作的重点是在碱性条件 (pH 9) 下用预处理的微藻生物质 ( Scenedesmus obtusiusculus )生产甲烷。碱性过氧化氢 (AHP) 用于热碱性预处理，并与使用 NaOH 或 CaO 的预处理进行比较。用 15% CaO 预处理溶解最高的碳水化合物 (22.1%) 和蛋白质 (18.3%)，而用 4 M NaOH 或 1.5% AHP 预处理的微藻生物质获得最高的甲烷产量（227.1 mL 和 208.4 mL CH 4 /g VS)，将甲烷潜力提高 34% 至 46%，并生产甲烷含量高达 91% 的沼气。初步的技术经济和能源分析表明，使用 4 M NaOH 可节能 40%，使用 1.5% AHP 可节能 31%；因此，AHP 可以被认为是微藻生物质预处理的合适选择。
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