Maximization of biogas by minimal microwave and alkaline pretreatment of rice straw

The growth and development of biomass-based energy are essential conditions for supplementing the renewable energy sector dominated by solar and wind energy. Conversion of rice straw to biogas by anaerobic digestion can play a vital role in enhancing energy security and the share of bioenergy. The b...

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Bibliographic Details
Published in:Biomass conversion and biorefinery 2024-07, Vol.14 (13), p.14365-14378
Main Authors: Naik, Gopal P., Poonia, Anil K., Chaudhari, Parmesh K.
Format: Article
Language:English
Subjects:
Alternative energy sources
Anaerobic conditions
Anaerobic digestion
Anaerobic processes
Biogas
Biomass
Biomass energy production
Biotechnology
Dilution
Energy
Energy industry
High power microwaves
Lignocellulose
Original Article
Pretreatment
Renewable and Green Energy
Renewable energy
Rice
Wind power
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Summary:The growth and development of biomass-based energy are essential conditions for supplementing the renewable energy sector dominated by solar and wind energy. Conversion of rice straw to biogas by anaerobic digestion can play a vital role in enhancing energy security and the share of bioenergy. The biggest hurdle in the process of digestion of lignocellulosic biomass like rice straw is the prerequisite of its pretreatment. Mostly high-power microwave and high-concentration alkaline pretreatment of lignocellulosic biomass have been studied. In the present study, dilute alkaline and low-power microwave techniques for efficient pretreatment of lignocellulosic materials have been considered. Anaerobic digestion of untreated and pretreated rice straws was performed at mesophilic temperature to compare the effectiveness of pretreatment methods for their biogas yield. Biogas obtained from untreated rice straw was found at 213.7 NmL/gVS. Among alkaline pretreatment with dilute NaOH solution of 0.1 to 0.5% concentrations, the best biogas yield of 418.5 NmL/gVS (96% higher than untreated) was obtained from 0.2% alkaline treated rice straw. Out of different microwave pretreatment from 100 to 500 W, the best biogas yields of 458.8 NmL/gVS (114% higher than untreated) were obtained from 300 W pretreated rice straws. The average biomethane content in the biogas generated after alkaline pretreatment was 52%, and in biogas generated after microwave, pretreatment was found to be 50.7%. Microwave pretreatment was found to be slightly better. Graphical Abstract
ISSN:2190-6815
2190-6823
DOI:10.1007/s13399-022-03539-1