Methane production from sugarcane vinasse: The alkalinizing potential of fermentative-sulfidogenic processes in two-stage anaerobic digestion

IF 8 Q1 ENERGY & FUELS Energy nexus Pub Date : 2024-04-30 DOI:10.1016/j.nexus.2024.100303
Renan Coghi Rogeri , Lucas Tadeu Fuess , Matheus Neves de Araujo , Felipe Eng , André do Vale Borges , Márcia Helena Rissato Zamariolli Damianovic , Ariovaldo José da Silva
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Abstract

The two-stage anaerobic digestion (2st-AD) of sugarcane vinasse is widely studied and well-known for improving the energy recovery potential in sugarcane biorefineries. Maintaining enhanced substrate acidification in a separate (first stage) reactor directly improves the performance of methanogenesis (second stage). However, problems derived from the presence of sulfate (SO42−) and the subsequent sulfide formation in the second stage are not prevented in conventional 2st-AD systems. In addition, high costs related to reactor alkalinization still represent significant drawbacks in that configuration. The energy recovery potential via methanogenesis was assessed from acidified sugarcane vinasse samples collected from different dark fermentative systems, namely: V1 (subjected to NaOH+NaHCO3 dosing), V2 (subjected to NaOH dosing) and V3 (subjected to no pH control). Despite the harmfulness of sulfide, the enhanced production of acetate from the incomplete oxidation of organic matter in sulfidogenesis can benefit methanogens. The highest methane yield (296.3 NmL-CH4 g-COD−1) and global energy recovery potential (354,603 GWh per season) were obtained from the lactate and SO42−rich vinasse (V2). Nevertheless, from a technological perspective, the methanogenesis of vinasses subjected to the fermentative-sulfidogenic process (V1) provided a higher quality biogas due to a higher calorific power (26.4-27.0 MJ Nm−3) and decreased H2S content in the biogas. Finally, the fermentative-sulfidogenic process as an alkalinizing strategy was demonstrated to be the best economic approach for scaling up the 2st-AD of sugarcane vinasse, overcoming the main economic drawback of this configuration.

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利用甘蔗渣生产甲烷:两级厌氧消化中发酵-硫化过程的碱化潜力
甘蔗渣的两级厌氧消化(2st-AD)已被广泛研究,在提高甘蔗生物炼油厂的能源回收潜力方面也广为人知。在单独的(第一阶段)反应器中保持较强的底物酸化,可直接改善甲烷生成(第二阶段)的性能。然而,在传统的 2st-AD 系统中,由于硫酸盐(SO42-)的存在以及随后在第二阶段硫化物的形成而产生的问题无法避免。此外,与反应器碱化有关的高成本仍然是该配置的重大缺陷。从不同的黑暗发酵系统中收集的酸化甘蔗渣样品评估了通过产甲烷进行能源回收的潜力:V1(NaOH+NaHCO3 配料)、V2(NaOH 配料)和 V3(无 pH 值控制)。尽管硫化物有害,但硫化物生成过程中有机物的不完全氧化所产生的乙酸盐的增加对甲烷菌有利。富含乳酸和 SO42 的沼渣(V2)获得了最高的甲烷产量(296.3 NmL-CH4 g-COD-1)和全球能源回收潜力(每季 354 603 GWh)。不过,从技术角度来看,采用发酵-硫化工艺(V1)的葡萄渣产生的甲烷可提供更高质量的沼气,因为热量更高(26.4-27.0 MJ Nm-3),沼气中的 H2S 含量也更低。最后,发酵-硫酸化工艺作为一种碱化策略,被证明是扩大甘蔗渣 2st-AD 规模的最佳经济方法,克服了这种配置的主要经济缺点。
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来源期刊
Energy nexus
Energy nexus Energy (General), Ecological Modelling, Renewable Energy, Sustainability and the Environment, Water Science and Technology, Agricultural and Biological Sciences (General)
CiteScore
7.70
自引率
0.00%
发文量
0
审稿时长
109 days
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