A study on green pretreatment of rice straw using Petha wastewater and Mausami waste assisted with microwave for production of ethanol and methane

Kumari, Dolly; Jain, Yogita; Singh, Radhika

doi:10.1016/j.ecmx.2020.100067

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…Maximum furfural and HMF were reported at 180–220 °C for 4% sulphuric acid pretreatment which was minimised by activated charcoal amendment for maximum bioethanol yield of 5.29% (v/v). A few batch studies were also performed for ethanol and methane production from PWW pretreated RS followed by microwave pretreatment in our lab 46 . We also explored various pretreatment methods for extraction of value added products from carbohydrate rich effluents and lignocellulosic biomass 47 , 48 .…”

Section: Resultsmentioning

confidence: 99%

Rice straw structure changes following green pretreatment with petha wastewater for economically viable bioethanol production

Kumari

Singh

2022

Sci Rep

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Energy efficient and environment friendly pretreatment processes for the production of biofuel have remained elusive and the research is further compounded by the high cost of processing lignocellulosic biomass—an essential factor for producing sustainable biofuels. In the last few decades, a number of pretreatment methods have been proposed, specifically chemical pretreatments but are either expensive or harmful to the environment. To address this urgent need, we propose a green pretreatment method that utilises the highly alkaline by-product, petha wastewater to pretreat the lignocellulosic waste rice straw (RS). The effectiveness of the pretreatment was analysed by monitoring both enhanced cellulose content and reducing sugar yield along with removal of hemicellulose and lignin. We found that PWW pretreatment yielded five times more reducing sugar than native RS with 10.12% increment in cellulose content. SEM and EDX studies further revealed that our process enhanced surface roughness and carbon content (from 32.19% increased to 41.59% and 41.66% for A and D, respectively) along with reduction in silica content (from 8.68% in RS to 4.30% and 7.72% for A and D, respectively). XRD and FTIR analyses indicate crystallinity index (CI) and alteration in lignocellulosic structure of RS, respectively. Decrease in CI was about 43.4% in A whereas only 4.5% in D as compared to native RS (CI 54.55%). Thereby we found PWW to be better substitute of an alkali for pretreatment of RS with negligible environmental impacts.

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Section: Resultsmentioning

confidence: 99%

Rice straw structure changes following green pretreatment with petha wastewater for economically viable bioethanol production

Kumari

Singh

2022

Sci Rep

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“…Fossil fuel is not only non-renewable but also causes environmental pollution and greenhouse effect owing to its massive consumption, which have brought great challenges to the survival of human beings. Therefore, it is necessary to search for a low-cost, environmentally friendly, clean energy . Ethanol fuel is cleaner and renewable compared to conventional fossil fuels, so it has been extensively studied and applied to practical life .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is necessary to search for a low-cost, environmentally friendly, clean energy. 1 Ethanol fuel is cleaner and renewable compared to conventional fossil fuels, so it has been extensively studied and applied to practical life. 2 It neither “competes with people for grains” nor “competes with grain for fields” when ethanol fuel is produced by lignocellulose as the raw material, so many countries have devoted great efforts to developing it.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Anaerobic Fermentation of Poplar Ethanol Wastewater: Performance and Microbial Communities

et al. 2023

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Temperature plays an important role in anaerobic digestion (AD), and different substrates have different optimum temperatures in AD. However, the effect of temperature on the performance of AD when cellulosic ethanol wastewater was used as a substrate was rarely reported. Therefore, the digestion characteristics of cellulosic ethanol wastewater at 25, 35, 45, and 55 °C were investigated, and the microbial communities of the sludge sample were analyzed after fermentation. The results showed that the cumulative methane production was the highest at 55 °C, 906.40 ± 50.67 mL/g VS, which was 81.06, 72.42, and 13.33% higher than that at 25, 35, and 45 °C, respectively. The content of methane was 68.13, 49.26, 70.46, and 85.84% at the terminal period of fermentation at temperatures of 25, 35, 45, and 55 °C, respectively. The testing of volatile fatty acids (VFAs) indicated that the accumulation of VFAs did not occur when the fermentation was carried out at 25, 35, and 45 °C; however, the VFA content at 55 °C was much larger than that in the three groups (25, 35, and 45 °C), and the ratio of propionic acid to acetic acid was larger than 1.4 at the late stage of fermentation, so it inhibited the fermentation. The diversity of the microbial community indicated that the floral structure and metabolic pathway of fermentation were alike at 25 and 35 °C. Firmicutes and Proteobacteria were the main flora covering the 25–55 °C-based phylum or below it. The relative abundance of Methanosaeta was the highest when fermentation temperatures were 25 and 35 °C; however, its relative abundance decreased sharply and the relative abundance of Methanosarcina increased substantially when the temperature increased from 35 to 45 °C, which indicated that Methanosarcina can exist in higher temperatures. At the same time, hydrogenotrophic methanogens such as Methanoculleus and Methanothermobacter were dominant when fermentation temperatures were 45 and 55 °C, which indicated that the metabolic pathway changed from acetoclastic methanogenesis to hydrogenotrophic methanogenesis.

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“…The latter affects the hardness of the whole complex and connects Energies 2022, 15, 5122 2 of 10 the other sugars to make a compact and durable compound, highly resistant to most enzymes and other substances. The properties of lignocellulosic biomass, such as the content of the main complex components, oxygen, hydrogen, nitrogen, sulphur, the dry matter and dry residue content, and the calorific value, play an important role in the processes of biomass conversion to energy [8,9]. Lignocellulose is successfully converted to biofuels, such as biogas, ethanol, and hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Cross-Comparison of the Impact of Grass Silage Pulsed Electric Field and Microwave-Induced Disintegration on Biogas Production Efficiency

2022

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Lignocellulosic biomass is included in the group of renewable energy sources. Its calorific value is high, owing to which it can be successfully used in the production of second-generation fuels, e.g., biogas. However, its complex structure makes it necessary to apply a pretreatment in order to increase the biogas output. This study presents the usability of a pulsed electric field in grass silage pretreatment in methane fermentation and compares it with microwave-induced disintegration. The experiment shows that substrate disintegration with a pulsed electric field (PEF) results in an increase in methane output. The productivity of methane from PEF pretreatment silage increased by 20.1% compared to the untreated control. The application of microwave disintegration, with the assumption that the same energy is used for the pretreatment, resulted in a methane output increase of 6% compared to the control. The highest biogas production output in PEF-pretreated samples was 535.57 NL/kg VS, while the highest biogas output from substrates pretreated with microwaves was 487.18 NL/kg VS.

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A study on green pretreatment of rice straw using Petha wastewater and Mausami waste assisted with microwave for production of ethanol and methane

Cited by 8 publications

References 34 publications

Rice straw structure changes following green pretreatment with petha wastewater for economically viable bioethanol production

Rice straw structure changes following green pretreatment with petha wastewater for economically viable bioethanol production

Effect of Temperature on Anaerobic Fermentation of Poplar Ethanol Wastewater: Performance and Microbial Communities

Cross-Comparison of the Impact of Grass Silage Pulsed Electric Field and Microwave-Induced Disintegration on Biogas Production Efficiency

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