Enhancing bioenergy from water hyacinth: pretreatment and anaerobic co-digestion.

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-12-01 Epub Date: 2025-08-07 DOI:10.1016/j.biortech.2025.133070

Adanyro Atilago, Sayon Dit Sadio Sidibé, Seyram Kossi Sossou, Maureen Norah Nabulime, Emily Lim McCoy, Marie Sawadogo, Stephanie Lansing

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Abstract

The lignocellulosic content in water hyacinth (WH) reduces anaerobic digestion efficiency. This study investigated potassium hydroxide (KOH) pretreatment at 5 %, 7.5 %, and 10 % KOH for 24 h with WH mono and co-digestion with dairy manure (DM) using 3:1, 1:1, and 1:3 ratios of WH to DM based on volatile solids (VS). Results showed the pH ranged from 7.5 to 8 after pre-treatment when mixing DM and inoculum, with lignin content reduced from 14.3 to 29.82 %. The highest CH₄ yield for mono-digestion was 275 NmL/g VS with 10 % KOH pretreatment (p < 0.001). Co-digestion (1:1) with 5 % KOH had the highest overall yield (412 NmL/g VS); 78.5 % higher than untreated WH (p < 0.001). The modified Gompertz model showed a R² best fit value of 0.97 with experimental data. This work showed co-digestion increased bioenergy production without pH adjustment after KOH pre-treatment, which reduces pretreatment costs, loss of VS, and wastewater generation from KOH treatment.

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提高水葫芦的生物能：预处理和厌氧共消化。

水葫芦中的木质纤维素含量降低了厌氧消化效率。研究了氢氧化钾（KOH）在5 %、7.5 %和10 %的KOH浓度下，与单一水清（WH）预处理24 h，并以挥发性固体（VS）为基础，分别以3:1、1:1和1:3的水清与乳粪（DM）共消化。结果表明：DM与接种物混合处理后，pH值在7.5 ~ 8之间，木质素含量从14.3%降低到29.82% %；当KOH浓度为10 %时，单酶消化CH4的最高产率为275 NmL/g VS （p 2与实验数据的最佳拟合值为0.97）。这项研究表明，共消化提高了KOH预处理后不需要调整pH的生物能源产量，从而降低了预处理成本、VS损失和KOH处理产生的废水。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.