Sustainable Biofuel Production from Agricultural Waste: Advances in Biochemical and Thermochemical Conversion Pathways | Chapter 8 | Current Research Progress in Agricultural Sciences Vol. 6

Introduction: Agricultural waste represents an underutilized renewable resource with significant potential for biofuel production. As global energy demands increase and climate change concerns intensify, the need for sustainable alternatives to fossil fuels has become critical. Agricultural residues and by-products offer a promising feedstock option that avoids competition with food production while addressing waste management challenges. These materials, primarily composed of lignocellulosic biomass, can be converted through various biological and thermochemical processes to produce liquid biofuels and biogas, potentially contributing to greenhouse gas mitigation efforts while supporting rural economies.

Aim: This study aims to evaluate the latest advancement in the production of biofuels from agricultural waste.

Materials and Methods: The study examines various types of agricultural waste, including crop residues, animal manure, and agro-industrial by-products, analysing their composition and suitability for biofuel production. Different conversion pathways are investigated, including fermentation, anaerobic digestion, pyrolysis, and gasification. The research evaluates pretreatment methods, enzyme production pathways, and synthesis processes for various biofuels like ethanol, butanol, and diesel substitutes. Case studies of operational plants and feasibility studies are analysed to assess technical and economic viability at commercial scale. Environmental impact assessments focus on greenhouse gas emissions, soil nutrient cycling, and sustainability metrics.

Results: The analysis reveals that agricultural waste can be effectively converted to biofuels through multiple pathways, each with specific advantages and challenges. Fermentation and anaerobic digestion show promising results for bioethanol and biogas production, while thermochemical processes demonstrate potential for producing advanced liquid fuels. Case studies indicate that commercial-scale operations are technically feasible, though economic viability varies with feedstock availability and processing efficiency. Environmental assessments show significant greenhouse gas reductions compared to fossil fuels, with additional benefits in waste management and soil nutrient recycling when properly implemented.

Discussion: While agricultural waste shows promise as a biofuel feedstock, several challenges must be addressed for widespread adoption. These include feedstock logistics, seasonal availability, and heterogeneous composition affecting conversion efficiency. Pretreatment technologies and process optimization remain critical areas for improvement. Economic viability depends on scale, technology selection, and policy support. Environmental benefits are significant but require careful management of soil health and nutrient cycling. Future research should focus on improving conversion efficiencies, developing integrated biorefinery concepts, and establishing sustainable supply chains.

Conclusion: Agricultural waste represents a viable and sustainable feedstock for biofuel production when integrated with appropriate conversion technologies. The review finds that while technical feasibility has been demonstrated at various scales, continued advancement in pretreatment technologies, process efficiency, and supply chain management is needed. Environmental benefits are substantial, particularly in greenhouse gas mitigation and waste management. Success in commercialization will require supportive policy frameworks, improved technology integration, and demonstration of long-term sustainability. The sector shows significant potential for contributing to renewable energy goals while supporting agricultural waste management and rural development.

 

Author (s) Details

 

Francis Mekunye
Auburn University, Alabama, USA.

 

Peter Makinde
Ohio University, Athens, USA.

 

Please see the book here:- https://doi.org/10.9734/bpi/crpas/v6/3285

Lignin Sources and Uses: A Review | Chapter 6 | Novel Aspects on Chemistry and Biochemistry Vol. 1

 The purpose concerning this brief review is to specify the structure of native lignin as well as the construction of technical lignin, containing information about the different traits found on stock exchange and the main pathways to treat it in applications as feedstock for bioproducts to obtain extreme added profit products. The efficient use of inexhaustible resources has arose as a driving force for global manufacturing seeking to boost competitiveness. Among the available natural natural resources, lignin, found in lignocellulosic biomass to a degree trees, is the only organic polymer with aromatic rings in allure constitution. Annually, nearly 50 million tons of lignin are produced general, with 98% to 99% of that amount incinerated to create energy and steam in pulp mills. In a biorefinery idea, only a small part of the lignin recovered from the sulfite pulp mill is commercially recovered. According to current research, technical lignin beginnings can also be used as feedstock for phenol derivative products, mechanics carbons, fuels, and adhesives. However, some mechanics challenges must be overcome before these uses can be realized.

Author(s) Details:

Fernando Jose Borges Gomes,
Forestry Products Department, Federal Rural University of Rio de Janeiro, Brazil.

Roberto Carlos Costa Lelis,
Forestry Products Department, Federal Rural University of Rio de Janeiro, Brazil.

Edva Oliveira Brito,
Forestry Products Department, Federal Rural University of Rio de Janeiro, Brazil.

Larisse Aparecida Ribas Batalha,
Forestry Products Department, Federal Rural University of Rio de Janeiro, Brazil.

Diana Catalina Cubides-Roman,
Forestry Products Department, Federal Rural University of Rio de Janeiro, Brazil.

Dalton Longue Junior,
Forest Engineering Course, State University of Southwest Bahia, Brazil.

Iara Fontes Demuner,
Forest Engineering Department, Federal University of Vicosa, Brazil.

Fernando Almeida Santos,
Biorefinery Studies Center, State University of Rio Grande do Sul, Porto Alegre, Brazil.

Rafael Eloy de Souza,
Forestry Products Department, Federal Rural University of Rio de Janeiro, Brazil.

Please see the link here: https://stm.bookpi.org/NACB-V1/article/view/10247

Utilization of Lignocellulosic Residues (Corn-cob and Pawpaw Fibre) as Substrates for Production and Optimization of Cellulase from Penicillium sp. | Chapter 12 | Current Research Trends in Biological Science Vol.4

 

Lignocellulosic residues are abundant in agricultural and forest industries in various countries where
they remain under exploited. They have useful potential in microbial systems in the secretion of
cellulases The present work investigated theutilization of lignocellulosic residues (corn-cob, CC and
pawpaw fibre, PF) as substrates for production and optimization of cellulase from Penicillium sp.A
total of nine fungal isolates were gotten from compost soil and were screened for cellulolytic activity
using Standard Methods. Cellulase activity was determined by the DNS method on Congo red agar
plate. Out of the nine isolates, Isolate CPF-1 was selected and identified as Penicillium sp. based on
its cultural and morphological characteristics. The influence of basic fermentation parameters on
enzyme production in solid state fermentation and the effects of some physicochemical parameters on
crude cellulase activity/stability were studied. The data obtained from the study revealed that the
optimal pH and temperature values for the production of crude cellulase by the Penicillium sp. were
pH 5 and 30°C, respectively; with maximum cellulase activity of 37.32 IU/mL. Optimum cellulase
productivity of 15.787 IU/mL was obtained with CC as the substrate while 2.141 IU/mL was obtained
with PF substrate after 1 h of fermentation. The cellulase produced was most stable at pH 5 and
temperature of 40°C. Fe2+ and Co2+ stimulated cellulase activity whereas the other ions inhibited the
enzyme activity. This study has revealed the potentials of corn-cob and pawpaw fibre as substrates
for cellulase production by Penicillium sp. through solid state fermentation (SSF); with corn-cob as the
most suitable substrate. Considering that these substrates are cost-effective and abundant as well
renewable, they present cheaper substrate alternatives for potential large-scale cellulase production
and reduction in environmental pollution problems.

Author (s) Details

Dr. Francis Sopuruchukwu Ire
Department of Microbiology, Faculty of Science, University of Port Harcourt, Choba, Nigeria.

Mr. Augustine Onwuchekwa Okoli
Department of Science Laboratory Technology, Federal Polytechnics, Oko, Anambra State, Nigeria.

Dinebari P. Berebon
Department of Pharmaceutical Microbiology and Biotechnology, Faculty of Pharmaceutical Sciences, University of Nigeria, Nsukka, Nigeria.

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