scholarly journals Biomass Valorization: Agricultural Waste in Environmental Protection, Phytomedicine and Biofuel Production

10.5772/66102 ◽  
2017 ◽  
Author(s):  
Adejumoke Abosede Inyinbor ◽  
Abimola Peter Oluyori ◽  
Tabitha Adunola Adelani-Akande
Keyword(s):  
Environmental Protection ◽  
Agricultural Waste ◽  
Biofuel Production ◽  
Biomass Valorization

scholarly journals Cellulosic biofuel production using emulsified simultaneous saccharification and fermentation (eSSF) with conventional and thermotolerant yeasts

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Shannon M. Hoffman ◽  
Maria Alvarez ◽  
Gilad Alfassi ◽  
Dmitry M. Rein ◽  
Sergio Garcia-Echauri ◽  
...  
Keyword(s):  
Simultaneous Saccharification And Fermentation ◽  
Agricultural Waste ◽  
Biofuel Production ◽  
Cellulosic Biofuels ◽  
Processing Times ◽  
Cellulosic Biofuel ◽  
Thermotolerant Yeasts ◽  
Rapid Hydrolysis ◽  
Dedicated Energy Crops ◽  
Simultaneous Saccharification

Abstract Background Future expansion of corn-derived ethanol raises concerns of sustainability and competition with the food industry. Therefore, cellulosic biofuels derived from agricultural waste and dedicated energy crops are necessary. To date, slow and incomplete saccharification as well as high enzyme costs have hindered the economic viability of cellulosic biofuels, and while approaches like simultaneous saccharification and fermentation (SSF) and the use of thermotolerant microorganisms can enhance production, further improvements are needed. Cellulosic emulsions have been shown to enhance saccharification by increasing enzyme contact with cellulose fibers. In this study, we use these emulsions to develop an emulsified SSF (eSSF) process for rapid and efficient cellulosic biofuel production and make a direct three-way comparison of ethanol production between S. cerevisiae, O. polymorpha, and K. marxianus in glucose and cellulosic media at different temperatures. Results In this work, we show that cellulosic emulsions hydrolyze rapidly at temperatures tolerable to yeast, reaching up to 40-fold higher conversion in the first hour compared to microcrystalline cellulose (MCC). To evaluate suitable conditions for the eSSF process, we explored the upper temperature limits for the thermotolerant yeasts Kluyveromyces marxianus and Ogataea polymorpha, as well as Saccharomyces cerevisiae, and observed robust fermentation at up to 46, 50, and 42 °C for each yeast, respectively. We show that the eSSF process reaches high ethanol titers in short processing times, and produces close to theoretical yields at temperatures as low as 30 °C. Finally, we demonstrate the transferability of the eSSF technology to other products by producing the advanced biofuel isobutanol in a light-controlled eSSF using optogenetic regulators, resulting in up to fourfold higher titers relative to MCC SSF. Conclusions The eSSF process addresses the main challenges of cellulosic biofuel production by increasing saccharification rate at temperatures tolerable to yeast. The rapid hydrolysis of these emulsions at low temperatures permits fermentation using non-thermotolerant yeasts, short processing times, low enzyme loads, and makes it possible to extend the process to chemicals other than ethanol, such as isobutanol. This transferability establishes the eSSF process as a platform for the sustainable production of biofuels and chemicals as a whole.

Processes simulation and environmental evaluation of biofuel production via Co-pyrolysis of tropical agricultural waste

Energy ◽  
2021 ◽  
pp. 123016
Author(s):  
Wenyu Mo ◽  
Zhe Xiong ◽  
Huiyi Leong ◽  
Xi Gong ◽  
Long Jiang ◽  
...  
Keyword(s):  
Agricultural Waste ◽  
Biofuel Production ◽  
Environmental Evaluation

scholarly journals Synthesis and characterization of rice husk biochar via hydrothermal carbonization for wastewater treatment and biofuel production

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Nazia Hossain ◽  
Sabzoi Nizamuddin ◽  
Gregory Griffin ◽  
Periasamy Selvakannan ◽  
Nabisab Mujawar Mubarak ◽  
...  
Keyword(s):  
Rice Husk ◽  
Agricultural Waste ◽  
Value Added ◽  
Hydrothermal Carbonization ◽  
Catalytic Performance ◽  
Biofuel Production ◽  
Suspension Stability ◽  
Waste Biomass ◽  
Suitable Material ◽  
Rice Husk Biochar

Abstract The recent implication of circular economy in Australia spurred the demand for waste material utilization for value-added product generations on a commercial scale. Therefore, this experimental study emphasized on agricultural waste biomass, rice husk (RH) as potential feedstock to produce valuable products. Rice husk biochar (RB) was obtained at temperature: 180 °C, pressure: 70 bar, reaction time: 20 min with water via hydrothermal carbonization (HTC), and the obtained biochar yield was 57.9%. Enhancement of zeta potential value from − 30.1 to − 10.6 mV in RB presented the higher suspension stability, and improvement of surface area and porosity in RB demonstrated the wastewater adsorption capacity. Along with that, an increase of crystallinity in RB, 60.5%, also indicates the enhancement of the catalytic performance of the material significantly more favorable to improve the adsorption efficiency of transitional compounds. In contrast, an increase of the atomic O/C ratio in RB, 0.51 delineated high breakdown of the cellulosic component, which is favorable for biofuel purpose. 13.98% SiO2 reduction in RB confirmed ash content minimization and better quality of fuel properties. Therefore, the rice husk biochar through HTC can be considered a suitable material for further application to treat wastewater and generate bioenergy.

scholarly journals Enhancing Enzymatic Digestibility of Coconut Husk using Nitrogen-assisted Subcritical Water for Sugar Production

2019 ◽  
Vol 15 (1) ◽  
pp. 84-95 ◽  
Author(s):  
Maktum Muharja ◽  
Nur Fadhilah ◽  
Tantular Nurtono ◽  
Arief Widjaja
Keyword(s):  
Enzymatic Hydrolysis ◽  
Subcritical Water ◽  
Agricultural Waste ◽  
Biofuel Production ◽  
Sugar Production ◽  
Operation Condition ◽  
Coconut Husk ◽  
Commercial Scale ◽  
Hydrolysis Process ◽  
Hydrolysis Of

Coconut husk (CCH) as an abundant agricultural waste in Indonesia has the potential to be utilized for sugar production, which is the intermediate product of biofuel. In this study, subcritical water (SCW) assisted by nitrogen (N2) was developed to enhance the enzymatic hydrolysis of CCH. SCW process was optimized by varying the operation condition: the pressure of 60-100 bar, the temperature of 150-190 °C, and the time of 20-60 min. The SCW-treated solid was subsequently hydrolyzed by utilizing a mixture of commercial cellulase and xylanase enzymes. The result shows that the optimum total sugar yield was obtained under the mild condition of SCW treatment, resulting in the sugar of 15.67 % and 10.31 % gained after SCW and enzymatic hydrolysis process, respectively. SEM and FTIR analysis of SCW-treated solid exhibited the deformation of lignin and solubilization of cellulose and hemicellulose, while XRD and TGA revealed an increase of the amount of crystalline part in the solid residue. The use of N2 in SCW treatment combined with enzymatic hydrolysis in this study suggested that the method can be considered economically for biofuel production from CCH waste in commercial scale. Copyright © 2020 BCREC Group. All rights reserved 

scholarly journals Stabilization and recycling of contaminated marine sediments

2019 ◽  
Vol 92 ◽  
pp. 11004 ◽  
Author(s):  
Francesco Todaro ◽  
Claudia Vitone ◽  
Michele Notarnicola
Keyword(s):  
Environmental Protection ◽  
Marine Sediments ◽  
Active Carbon ◽  
Circular Economy ◽  
Agricultural Waste ◽  
Environmental Issue ◽  
Geotechnical Characteristics ◽  
First Results ◽  
Interesting Solution ◽  
Contaminated Marine Sediments

The paper deals with the treatment and reuse of submarine sediments, i.e. a relevant environmental issue due to the annual huge quantities of dredged sediments (over half contaminated) in Europe. In a vision of sustainability and circular economy, stabilization and solidification (S/S) treatments represent an interesting solution for both environmental protection and reuse of sediments in engineering works. The investigation involved polluted clayey sediments taken up to depths of about 1.5m from the seafloor of the Gulf of Taranto (South of Italy). The research investigates the effects of a treatment with cement and lime enhanced by the addition of green additives, such as active carbon and biochar, for chemical remediation. The last one is a promising and cheap adsorbent material, that is the by-product of - mainly - agricultural waste pyrolysis. The first results suggest that appropriate mix designs and curing times could allow the reuse of sediments by both improving their geotechnical characteristics and making them environmentally acceptable in accordance to end-of-waste criteria.

scholarly journals Analysis of the Circular Economic Production Models and Their Approach in Agriculture and Agricultural Waste Biomass Management

2020 ◽  
Vol 17 (24) ◽  
pp. 9549
Author(s):  
Mónica Duque-Acevedo ◽  
Luis Jesús Belmonte-Ureña ◽  
Natalia Yakovleva ◽  
Francisco Camacho-Ferre
Keyword(s):  
Circular Economy ◽  
Agricultural Waste ◽  
Biofuel Production ◽  
Waste Biomass ◽  
Scientific Publications ◽  
Economic Production ◽  
Production Models ◽  
Development Policies ◽  
Biomass Management ◽  
The Uk

As of now, circular economic production models of the circular economy (CEPMs), which include circular economy, bioeconomy, and circular bioeconomy, are among the main tools characterizing development policies in different countries. During the last five years, policies and strategies regarding CEPMs have promoted and contributed to the development of research on this topic. The evolution and most relevant aspects of the three CEPMs previously mentioned have been analyzed from a sample of 2190 scientific publications obtained from the Scopus database. Bibliometric analysis has been used to evaluate the approach of these models in agriculture and to introduce the ways in which they address the management of agricultural waste biomass (AWB). Results show that the circular economy is the most studied and prioritized model in China and most European countries, with the UK leading the way. Germany leads in topics related to the bioeconomy. The management policies and strategies of the circular bioeconomy are key to promoting research focused on AWB valorization since bioenergy and/or biofuel production continue to be a priority.

scholarly journals Biofuel production and its quality standards

2013 ◽  
pp. 137-141
Author(s):  
Orsolya Nagy
Keyword(s):  
Environmental Protection ◽  
Greenhouse Effect ◽  
Co2 Emission ◽  
Quality Standards ◽  
Energy Resources ◽  
Biofuel Production ◽  
Living Standard ◽  
Fuel Prices

The increasing consumption due to the decreasing amount of fossile energy resources, as well as the increasing fuel prices and living standard will justify the better utilisation of the opportunities lying in biofuel production. Certain countries produce biofuels for their own use or they even export them. However, there are countries which have not decided which feedstock and technology to use. Biofuel – mainly biodiesel and bioethanol – use greatly contributes to environmental protection, decreased CO2 emission and reduced greenhouse effect.

Sign in / Sign up

Export Citation Format

Share Document