Bioethanol production from acid pretreated microalgal hydrolysate using microwave-assisted heating wet torrefaction

Yu, Kai; Chen, Wei‐Hsin; Sheen, Herng-Kuang; Chang, Jo‐Shu; Lin, Chih‐Sheng; Ong, Hwai Chyuan; Show, Pau Loke; Ling, Tau Chuan

doi:10.1016/j.fuel.2020.118435

Cited by 68 publications

(18 citation statements)

References 82 publications

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“…Pemanasan yang merata dapat meningkatkan hasil gula pereduksi pada proses hidrolisis menggunakan asam encer. Penelitian Teh et al (2017) dengan melakukan hidrolisis Euchema denticulactum menggunakan microwave dapat meningkatkan hasil gula pereduksi sebesar 51,47 g/L sedangkan Yu et al, (2020) menghasilkan gula pereduksi optimum sebesar 98,11 g/L dengan hidrolisis menggunakan microwave irradiation. Berdasarkan kedua penelitian tersebut dapat disimpulkan bahwa hidrolisis menggunakan microwave irradiation dapat mempengaruhi kadar gula pereduksi.…”

Section: Hidrolisis Ulva Reticulata Dengan Microwave Variasi Suhu Hidrolisis Menggunakan Microwaveunclassified

“…Berdasarkan konversi berat jenis maka etanol yang diperoleh adalah sebesar 1%. Kadar etanol ini lebih tinggi dibandingkan penelitian terdahulu dengan metode microwave irradiation pada mikroalga Chorella SP GD oleh Yu et al (2020) yang hanya mendapatkan kadar bioetanol sebesar 0,68%.…”

Section: Analisis Kuantitatif Kadar Etanol Dengan Metode Piknometer Dan Kromatografi Gas (Gc)unclassified

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Produksi Bioetanol sebagai Energi Terbarukan dari Rumput Laut Ulva reticulata Asal Pulau Timor

2021

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Rumput laut dengan kandungan karbohidrat dan lipid yang tinggi dianggap menjadi sumber energi terbarukan generasi ketiga. Penelitian ini bertujuan menentukan kadar gula pereduksi optimum, mengetahui tekstur permukaan serbuk sebelum dan sesudah hidrolisis serta menentukan kadar etanol hasil fermentasi. Kandungan karbohidrat rumput laut Ulva reticulata dapat dikonversi menjadi gula heksosa dan pentosa (glukosa, arabinosa, ramnosa, dan xilosa) melalui hidrolisis asam. Campuran gula optimum hasil proses hidrolisis kemudian dikonversi menjadi etanol menggunakan ragi Saccharomyces cerevisiae. Fermentasi dilakukan dengan konsentrasi inokulum 10% (v/v) selama 5 hari pada temperatur 30 °C dan pH 4,5. Analisis tekstur permukaan sampel dilakukan dengan Scanning Electron Microscopy (SEM). Analisis gula pereduksi dilakukan dengan metode DNS (Dinitro salisilat). Analisis etanol dilakukan dengan uji kualitatif dan kuantitatif menggunakan metode berat jenis dan kromatografi gas. Hasil penelitian menunjukkan bahwa kadar gula pereduksi meningkat seiring meningkatnya suhu hidrolisis pada suhu 75 °C ke 150 °C (2,3 – 23,7 g/L) dan mengalami penurunan kadar pada suhu 175 °C menjadi 17,1 g/L. Hasil analisis dengan variasi konsentrasi terhadap waktu 30, 40, 50, dan 60 menit terlihat bahwa kadar gula pereduksi meningkat seiring meningkatnya waktu hidrolisis dari 30 menit sampai 50 menit yakni 23,7 – 33,4 g/L dan mengalami penurunan pada waktu 60 menit yakni 19,2 g/L. Kadar gula pereduksi optimum sebesar 33,4 g/L pada suhu 150 °C dengan konsentrasi asam 2 % pada waktu hidrolisis 50 menit. Tekstur permukaan serbuk sebelum dan sesudah hidrolisis mengalami perubahan yang signifikan. Hasil uji kualitatif etanol hasil fermentasi dibuktikan dengan adanya perubahan warna dari jingga menjadi biru. Hasil uji kadar etanol dengan metode berat jenis yakni sebesar 1% dan metode kromatografi gas sebesar 5,02%. Bioethanol Production as Renewable Energy from Ulva Reticulata Seaweed from Timor Island. Seaweed with carbohydrate and lipid content is considered to be the third generation of renewable energy sources. The carbohydrate content of Ulva reticulata seaweed can be converted into hexose and pentose sugars (glucose, arabinose, ramnose, and xylose) through acid hydrolysis. The optimum sugar mixture resulting from the hydrolysis process is then converted to ethanol using Saccharomyces cerevisiae yeast. Fermentation was carried out with an inoculum concentration of 10% (v/v) for five days at a temperature of 30 °C and a pH of 4.5. Analysis of the surface texture of the sample was carried out by Scanning Electron Microscopy (SEM). Reducing sugar analysis was performed using the DNS (Dinitrosalicylate) method. Ethanol analysis was carried out by qualitative and quantitative tests using specific gravity and gas chromatography methods. The results showed that the reducing sugar content increased with increasing hydrolysis temperature at 75 °C to 150 °C (2.3 – 23.7 g/L) and decreased levels at 175 °C to 17.1 g/L. The results of the analysis with various concentrations of 30, 40, 50, and 60 minutes showed that reducing sugar levels increased with increasing hydrolysis time from 30 minutes to 50 minutes, namely 23.7 – 33.4 g/L and decreased at 60 minutes, namely 19.2 g/L. The optimum reducing sugar content was 33.4 g/L at 150 °C with an acid concentration of 2% at 50 minutes of hydrolysis. Powder surface texture before and after hydrolysis experienced significant changes. The qualitative test results of fermented ethanol are evidenced by a change in color from orange to blue. The results of the ethanol content test using the specific gravity method were 1%, and that using the gas chromatography method was 5.02%.

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Section: Hidrolisis Ulva Reticulata Dengan Microwave Variasi Suhu Hidrolisis Menggunakan Microwaveunclassified

Section: Analisis Kuantitatif Kadar Etanol Dengan Metode Piknometer Dan Kromatografi Gas (Gc)unclassified

Produksi Bioetanol sebagai Energi Terbarukan dari Rumput Laut Ulva reticulata Asal Pulau Timor

2021

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“…Over the past decade, concerns related to the alarming impacts of global warming and depletion of non-renewable resources have contributed to the exploitation of the abundant renewable resource of agro-wastes or biomass wastes, such as sugarcane bagasse and forest residues, for bioenergy production (Yu et al, 2021 ). With a view to tap into the full potential of agro-wastes, researchers have further explored the use of such versatile material in diverse highly valued applications including biofuel production, biodegradable packaging materials and biomass composites used as adsorbent of water pollutants and dyes (Basri et al, 2019 ; Yadav et al, 2021 ; Yu et al, 2020a , b , 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of cellulose nanocrystals from bagasse and coir agro-wastes for reinforcing PVA-based composites

Pavalaydon

Ramasawmy

Surroop

2021

Environ Dev Sustain

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In order to increase resilience of planters against climate change and bring additional economic benefits, agro-wastes can be exploited for extracting nanocellulose to produce eco-friendly composites. This paper focused on extracting nanocellulose from sugarcane bagasse and coir ( cocos nucifera ) using chemical methods including mercerisation, bleaching and acid hydrolysis. Taguchi Design of Experiment showed that the optimum alkaline treatment conditions of bagasse were at 2 wt% NaOH at 90 °C for 16 h. The morphological changes occurring along each treatment stage were observed using Fourier-Transform Infrared spectroscopy and Scanning Electron Microscopy. The differences in the nanoparticles extracted from the two biomass were studied through the determination of crystallinity indexes and particle size. Cellulose nanocrystals (CNCs) from coir exhibited a total crystallinity index (TCI) of 1.03 and an average particle size of 137.3 nm while CNCs extracted from sugarcane bagasse under similar treatment conditions had a TCI of 0.85 and an average particle size of around 48 µm. Dynamic Light Scattering findings showed risks of agglomeration after freeze drying. Bio-nanocomposite films with polyvinyl alcohol (PVA) as matrix were manufactured by the solvent casting process. The highest tensile strength (38.2 MPa) was obtained for CNCs extracted from coir at a CNC/PVA loading of 0.5 wt%, representing a 96.9% increase in the tensile strength as compared to the unreinforced PVA matrix. This study showed that sugarcane bagasse and coir are suitable sources of nanocellulose and can be used to prepare bio-composites with considerably high tensile strengths.

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“…The cell walls of microalgae are characterized by low lignin content and are mainly composed of cellulose. Additionally, starch is a carbohydrate produced by photosynthesis and is present in large amounts in microalgae [ 9 ]. The pretreatment and enzymatic hydrolysis processes of microalgae can be minimized compared to lignocellulosic feedstock due to its low lignin content.…”

Section: Introductionmentioning

confidence: 99%

Process Development for the Detoxification of Fermentation Inhibitors from Acid Pretreated Microalgae Hydrolysate

et al. 2021

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The aim of this study was to remove 5-hydroxymethyl furfural (5-HMF) and furfural, known as fermentation inhibitors, in acid pretreated hydrolysates (APH) obtained from Scenedesmus obliquus using activated carbon. Microwave-assisted pretreatment was used to produce APH containing glucose, xylose, and fermentation inhibitors (5-HMF, furfural). The response surface methodology was applied to optimize key detoxification variables such as temperature (16.5–58.5 °C), time (0.5–5.5 h), and solid–liquid (S-L) ratio of activated carbon (0.6–7.4 w/v%). Three variables showed significant effects on the removal of fermentation inhibitors. The optimum detoxification conditions with the maximum removal of fermentation inhibitors and the minimum loss of sugars (glucose and xylose) were as follows: temperature of 36.6 °C, extraction time of 3.86 h, and S-L ratio of 3.3 w/v%. Under these conditions, removal of 5-HMF, furfural, and sugars were 71.6, 83.1, and 2.44%, respectively, which agreed closely with the predicted values. When the APH and detoxified APH were used for ethanol fermentation by S. cerevisiae, the ethanol produced was 38.5% and 84.5% of the theoretical yields, respectively, which confirmed that detoxification using activated carbon was effective in removing fermentation inhibitors and increasing fermentation yield without significant removal of fermentable sugars.

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Bioethanol production from acid pretreated microalgal hydrolysate using microwave-assisted heating wet torrefaction

Cited by 68 publications

References 82 publications

Produksi Bioetanol sebagai Energi Terbarukan dari Rumput Laut Ulva reticulata Asal Pulau Timor

Produksi Bioetanol sebagai Energi Terbarukan dari Rumput Laut Ulva reticulata Asal Pulau Timor

Comparative evaluation of cellulose nanocrystals from bagasse and coir agro-wastes for reinforcing PVA-based composites

Process Development for the Detoxification of Fermentation Inhibitors from Acid Pretreated Microalgae Hydrolysate

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