{"title":"Baling and ensiling of wet cereal straw as combined storage and pretreatment for biogas production","authors":"Søren Ugilt Larsen , Henrik Bjarne Møller","doi":"10.1016/j.biombioe.2024.107294","DOIUrl":null,"url":null,"abstract":"<div><p>Cereal straw is a large biomass resource which may potentially be pretreated for biogas production by combined ensiling and storage. Five pilot-scale ensiling experiments were performed with straw of wheat, barley and rye, baled in midi-bales (0.9*1.2*2.0 m) with various water contents (17–68 %), ensiling additives and ensiling periods (173–230 days). The water content in the bales differed depending on previous precipitation but also the time of day for baling. Temperature in wet straw increased to 30 and 63 °C during storage for bales with and without wrapping, respectively, and mean dry weight loss was 5.1 ± 5.9 % and 10.5 ± 7.3 %, respectively.</p><p>During storage, pH dropped significantly in wrapped straw bales but not in bales without wrapping. In wrapped straw without additives, pH after ensiling decreased significantly with increasing initial water content, indicating the importance of water content above 30–40 % for ensiling of straw. Besides a more rapid pH reduction when applying acetic acid, there was no significant effect of acetic and formic acid, lactic acid bacteria and brown juice on pH after storage.</p><p>Ensiling of wet straw had a significant effect on biochemical methane potential (BMP) in some cases, with up to 32 % increase. There was limited effect of ensiling additives on BMP, whereas increasing water content in the straw significantly increased BMP. Improper wrapping of straw during storage reduced BMP with 17–30 %. Overall, proper wrapping and good ensiling of wet straw may result in up to 25 % extra methane yield whereas poor storage may result in up to 37 % loss.</p></div>","PeriodicalId":253,"journal":{"name":"Biomass & Bioenergy","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0961953424002472/pdfft?md5=b4ecf477d9ed06c3330dc5f3a376da87&pid=1-s2.0-S0961953424002472-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biomass & Bioenergy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0961953424002472","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Cereal straw is a large biomass resource which may potentially be pretreated for biogas production by combined ensiling and storage. Five pilot-scale ensiling experiments were performed with straw of wheat, barley and rye, baled in midi-bales (0.9*1.2*2.0 m) with various water contents (17–68 %), ensiling additives and ensiling periods (173–230 days). The water content in the bales differed depending on previous precipitation but also the time of day for baling. Temperature in wet straw increased to 30 and 63 °C during storage for bales with and without wrapping, respectively, and mean dry weight loss was 5.1 ± 5.9 % and 10.5 ± 7.3 %, respectively.
During storage, pH dropped significantly in wrapped straw bales but not in bales without wrapping. In wrapped straw without additives, pH after ensiling decreased significantly with increasing initial water content, indicating the importance of water content above 30–40 % for ensiling of straw. Besides a more rapid pH reduction when applying acetic acid, there was no significant effect of acetic and formic acid, lactic acid bacteria and brown juice on pH after storage.
Ensiling of wet straw had a significant effect on biochemical methane potential (BMP) in some cases, with up to 32 % increase. There was limited effect of ensiling additives on BMP, whereas increasing water content in the straw significantly increased BMP. Improper wrapping of straw during storage reduced BMP with 17–30 %. Overall, proper wrapping and good ensiling of wet straw may result in up to 25 % extra methane yield whereas poor storage may result in up to 37 % loss.
期刊介绍:
Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials.
The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy.
Key areas covered by the journal:
• Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation.
• Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal.
• Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes
• Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation
• Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.