Microwave Assisted Alkaline Pretreatment of Algae Waste in the Production of Cellulosic Bioethanol

Maceiras, R.; Alfonsín, Víctor; Seguí, Luis; González, J.F.

doi:10.3390/en14185891

Cited by 15 publications

(4 citation statements)

References 46 publications

(49 reference statements)

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“…The concentrated sulfuric acid used in the pretreatment step of the production process has a relatively large impact on the environment. In recent years, more biomass pretreatment methods have been developed such as microwave assisted alkaline pretreatment [26], low temperature ionic liquid pretreatment [27]. However, their cost is still high and efficiency still insufficient compared with the original method.…”

Section: Resultsmentioning

confidence: 99%

The impact of lignocellulosic ethanol production on the environment from a life cycle perspective

Gong

2023

J. Phys.: Conf. Ser.

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In the production process of cellulosic ethanol, all sections are closely related. It is difficult to study its producing law and key factors that affect the process only by experimental means. Computer simulation has a powerful data mining ability, which can analyze, design, and evaluate the production process of cellulosic ethanol. Specifically, it can use data calculated by Aspen Plus before, and analyze the impact of cellulose ethanol production on the environment by life cycle assessment (LCA). Results show that the total environmental impact value of the whole process is 0.20∼0.37 person·a/t. And in the whole process, the growth stage and the production stage have the biggest impact.

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Section: Resultsmentioning

confidence: 99%

The impact of lignocellulosic ethanol production on the environment from a life cycle perspective

Gong

2023

J. Phys.: Conf. Ser.

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“…KOH-steam-pretreated seedpods offered maximum ethanol production in SSF when hydrolyzed with commercial cellulase. Ethanol production from this KOH-steam treatedsubstrate in SSF was further optimized through OFAT [22] by varying different physical parameters, i.e., concentration of substrate (2%, 4%, 6%, 8%, 10%), pH (4,5,6,7,8), cellulase concentration FPU (20,40,60,80,100,120) and S. cerevisiae inoculum size (1%, 2%, 3%, 4%, 5% v/v) in media containing nutrients (g/L), i.e., glucose 10, (NH 4 ) 2 SO 4 2.5, KH 2 PO 4 1, MgSO 4 0.5, and yeast extract 2.5.…”

Section: Optimization Of Physical Parameters For Ethanol Production I...mentioning

confidence: 99%

“…The second step is saccharification, which is conversion of cellulose into sugars by cellulase enzymes. The third step is fermentation of saccharified material to ethanol yeast such as Saccharomyces cerevisiae [8,9]. Different technical approaches such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) have been extensively used to study the structural and chemical changes generated by pretreatments of lignocellulosic biomass [10].…”

Section: Introductionmentioning

confidence: 99%

Bioethanol Production Optimization from KOH-Pretreated Bombax ceiba Using Saccharomyces cerevisiae through Response Surface Methodology

et al. 2022

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The present study was based on the production of bioethanol from alkali-pretreated seed pods of Bombax ceiba. Pretreatment is necessary to properly utilize seed pods for bioethanol production via fermentation. This process assures the accessibility of cellulase to the cellulose found in seedpods by removing lignin. Untreated, KOH-pretreated, and KOH-steam-pretreated substrates were characterized for morphological, thermal, and chemical changes by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Hydrolysis of biomass was performed using both commercial and indigenous cellulase. Two different fermentation approaches were used, i.e., separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation (SSF). Findings of the study show that the maximum saccharification (58.6% after 24 h) and highest ethanol titer (57.34 g/L after 96 h) were observed in the KOH-steam-treated substrate in SSF. This SSF using the KOH-steam-treated substrate was further optimized for physical and nutritional parameters by one factor at a time (OFAT) and central composite design (CCD). The optimum fermentation parameters for maximum ethanol production (72.0 g/L) were 0.25 g/L yeast extract, 0.1 g/L K2HPO4, 0.25 g/L (NH4)2SO4, 0.09 g/L MgSO4, 8% substrate, 40 IU/g commercial cellulase, 1% Saccharomyces cerevisiae inoculum, and pH 5.

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“…Perlakuan awal menggunakan microwave memiliki efisiensi pemanasan yang tinggi dan mudah diterapkan. Penelitian telah menunjukkan bahwa iradiasi microwave mengubah ultrastruktur selulosa limbah alga, waktu reaksi yang singkat, konsumsi energi yang rendah meningkatkan efisiensi dan efektifitas reaksi (Maceiras et al, 2021).…”

Section: Pendahuluanunclassified

Pengaruh Perlakuan Awal Ampas Biji Jewawut (Setaria italica L.) dengan Microwave Irradiation Untuk Produksi Bioetanol

2022

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Produksi energi terbarukan termasuk bioetanol menjadi alternatif penganti bahan bakar fosil. Salah satunya dari ampas jewawut karena memiliki kandungan selulosa sebesar 32,41% sehingga sangat potensial dan ekonomis sebagai sumber energi baru terbarukan. Penelitian ini bertujuan mengetahui morfologi permukaan, suhu dan konsentrasi H2SO4 optimum pada proses hidrolisis menggunakan microwave dan kadar bioetanol dari hidrolisat ampas biji jewawut. Penelitian ini terdiri atas empat tahapan yaitu proses hidrolisis menggunakan microwave, fermentasi, distilasi dan pengujian kadar bioetanol baik secara kualitatif maupun kuantitatif menggunakan metode berat jenis dan kromatografi gas. Hidrolisis dilakukan melalui variasi suhu 75℃, 100℃, 125℃, 150℃, dan 175℃ dan konsentrasi H2SO4 0,5%, 1%, 2%, 5% dan 7%. Hasil penelitian menunjukkan bahwa morfologi permukaan sampel sebelum hidrolisis memiliki permukaan yang datar, kasar dan kaku namun setelah dihidrolisis permukaan sampel menjadi rapuh dan halus. Analisa gula pereduksi menggunakan pereaksi DNS (Dinitrosalisilat) diperoleh suhu optimum microwave yaitu pada suhu 150℃ dengan kadar gula pereduksi sebesar 25,3 g/L dan konsentrasi H2SO4 optimum pada 5% dengan kadar gula pereduksi sebesar 32,8 g/L. Uji kualitatif dari hasil fermentasi dan distilasi menunjukkan pada sampel mengandung bioetanol yang ditandai dengan terjadinya perubahan warna kalium dikromat dari warna jingga menjadi hijau kebiruan. Kadar bioetanol yang diperoleh dengan metode berat jenis sebesar 5% dan 6,08% dari analisa dengan kromatografi gas.Pretreatment Effect of Barley Seed Dregs (Setaria italica L.) with Microwave Irradiation for Bioethanol Production. Renewable energy production, including bioethanol, is an alternative to fossil fuels. One of the alternative sources is barley dregs because it has a cellulose content of 32.41%; thus, it is very potential and economical as a new renewable energy source. This study aims to determine the surface morphology, temperature, and optimum H2SO4 concentration in the hydrolysis process using a microwave and the bioethanol content of the hydrolyzed barley seed dregs. The research comprised four steps: hydrolysis, fermentation, distillation, and qualitatively and quantitatively analysis of bioethanol levels using specific gravity and gas chromatography methods. Hydrolysis was carried out by varying the temperature of 75℃, 100℃, 125℃, 150℃, and 175℃, and the concentration of H2SO4 was 0.5%, 1%, 2%, 5%, and 7%. The results showed that the surface morphology of the sample before hydrolysis had a flat, rough and rigid surface; however, after hydrolysis, the sample's surface became brittle and smooth. Analysis of reducing sugar using DNS reagent (dinitrosalicylate) obtained the optimum microwave temperature at 150℃ with a reducing sugar content of 25.3 g/L and an optimum concentration of H2SO4 at 5% with a reducing sugar content of 32.8 g/L. The qualitative test of the fermentation and distillation results shows the samples containing bioethanol marked by the changes in potassium dichromate colors from orange to bluish-green. The bioethanol content obtained by the specific gravity method was 5% and 6.08% from analysis by gas chromatography.

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Microwave Assisted Alkaline Pretreatment of Algae Waste in the Production of Cellulosic Bioethanol

Cited by 15 publications

References 46 publications

The impact of lignocellulosic ethanol production on the environment from a life cycle perspective

The impact of lignocellulosic ethanol production on the environment from a life cycle perspective

Bioethanol Production Optimization from KOH-Pretreated Bombax ceiba Using Saccharomyces cerevisiae through Response Surface Methodology

Pengaruh Perlakuan Awal Ampas Biji Jewawut (Setaria italica L.) dengan Microwave Irradiation Untuk Produksi Bioetanol

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