Study of Acid Hydrolysis on Organic Waste: Understanding The Effect of Delignification and Particle Size

Anwar, Nadiem; Mukhaimin, Iman; Harsanti, Mining; Romli, Ate

doi:10.1051/matecconf/201815603006

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…This result is in line with other studies. Anwar [18] studied lignin extraction from rice husks using AHP. The result showed that the optimum conditions for lignin isolation were a solvent/solid ratio of 9:1 ml/gr, hydrogen peroxide concentration of 1.5%v, and pH of the mixture of 11.…”

Section: The Effect Of Phmentioning

confidence: 99%

Delignification of Cassava Peel by Using Alkaline Hydrogen Peroxide Method: Study of Peroxide Concentration, Solid/Liquid Ratio, and pH

Damajanti¹,

Mustholidah²,

Hariyanti³

2022

J. Tek. Kim. Ling

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Kulit singkong merupakan bahan alami dengan kandungan selulosa mencapai 33.33%. Dalam rangka pemanfaatan kulit singkong sebagai alternatif polimer alam maupun energi terbarukan, maka diperlukan proses delignifikasi untuk memisahkan selulosa dari hemiselulosa dan lignin yang menghalangi penetrasi cairan penghidrolisis selulosa. Metode yang dipilih adalah delignifikasi dengan metode alkali hidrogen peroksida (AHP). Metode AHP dilakukan berdasarkan prinsip autooksidasi oleh hidrogen peroksida (H2O2) basa. Metode ini dipilih karena dapat merusak struktur lignoselulosa dengan energi yang relatif rendah dan lebih selektif terhadap lignin. Walaupun demikian, pada kondisi tertentu penggunaan AHP dapat memicu depolimerisasi karbohidrat yang mengakibatkan penurunan yield. Oleh karenanya perlu dipelajari pengaruh konsentrasi H2O2, rasio Solid/Liquid (S/L) (b/v), serta pH terhadap efektivitas penghilangan lignin pada kulit singkong. Konsentrasi H2O2 divariasikan menjadi 1.5%, 3%, 4.5%, 6%, dan 7.5%. Rasio S/L divariasikan menjadi 1:3, 1:5, 1:7, 1:9, 1:12. pH larutan divariasikan menjadi 8, 9, 10, 11, dan 12. Suhu reaksi dijaga pada rentang 70-90°C selama 3 jam reaksi. Hasil penelitian menunjukkan bahwa lignin dapat diturunkan hingga 84,05% selama 3 jam reaksi. Kondisi yang diperlukan untuk mencapai kondisi tersebut adalah: Konsentrasi H2O2 sebesar 6%, rasio S/L 1:5 dan pH larutan 11. Reaksi yang dilakukan dengan kondisi tersebut juga dapat meningkatkan jumlah selulosa dari 33.33% hingga 49.00%.Cassava peel is a natural material with cellulose content reaching 33.33%. In order to utilize cassava peel as a biodegradable polymer and renewable energy alternative, a delignification process is essential to separate cellulose from hemicellulose and lignin, which prevents the penetration of cellulose hydrolyzer. The delignification method chosen in this study was alkaline hydrogen peroxide (AHP). The AHP is based on the autoxidation of lignin using hydrogen peroxide (H2O2) in an alkaline environment. This method was chosen because it can damage the lignocellulosic structure with relatively low energy and is more selective for lignin. However, under certain conditions, AHP can trigger carbohydrate depolymerization, which decreases yield. Therefore, it is necessary to study the effect of H2O2 concentration, Solid/Liquid ratio (S/L) (w/v), and pH to evaluate the effectiveness of lignin removal in cassava peel. The concentration of H2O2 was varied into 1.5%, 3%, 4.5%, 6%, and 7.5%. The S/L ratio is varied to 1:3, 1:5, 1:7, 1:9,1:12. The pH of the solution was varied to 8, 9, 10, 11, and 12. The reaction temperature was maintained at 70-90 °C for 3 hours. The results showed that lignin could be reduced to 84.05% for 3 hours by using 6% H2O2, an S/L ratio of 1:5, and a pH of 11. The reaction carried out under these conditions can also increase the amount of cellulose from 33.33% to 49.00%.

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Section: The Effect Of Phmentioning

confidence: 99%

Delignification of Cassava Peel by Using Alkaline Hydrogen Peroxide Method: Study of Peroxide Concentration, Solid/Liquid Ratio, and pH

Damajanti¹,

Mustholidah²,

Hariyanti³

2022

J. Tek. Kim. Ling

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Optimization of xylitol production through Candida tropicalis in xylose hydrolysate from rice husk

Eraso,

Cuaspud,

Arias

2024

Biomass Conv. Bioref.

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Owing to the extensive cultivation and production of rice, which consequently generates a high amount of rice husk, rice husk is an easily available lignocellulosic waste; however, the applications it currently has do not entirely exploit its potential. This study aims the production of xylitol as an opportunity to value this residue through fermentation of rice husk hydrolysate. For it, the best particle size of rice husk among 0.25–0.6 mm, 0.6–1.2 mm, and unmilled rice husk (URH) for dilute acid hydrolysis was determined by using a randomized complete block design (RCBD) to select the particle size that produced the highest amount of xylose release; subsequently, adaptation of Candida tropicalis was carried out as an alternative to common detoxification methods, by increasing the concentration of hydrolysate in the medium in 20% every 2 days, and then, xylitol fermentation from the best particle size hydrolysate with C. tropicalis was optimized performing a central composite design (CCD) 22. The best particle size for dilute acid hydrolysis was URH and produced a xylose concentration of 12.85 g/L, and the optimal conditions for xylitol fermentation were 4.41 g/L of inoculum and 68.28 g/L of xylose and accomplished a concentration of 36.74 g/L of xylitol, a yield of 0.58 g/g xylose, and a volumetric productivity of 0.34 g/L/h, providing evidence that rice husk has the potential to be valorized as a source of fermentable sugars for the production of xylitol as a high-value metabolite and proving adaptation method as a viable alternative for the strain’s growth as well as xylitol production.

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Study of Acid Hydrolysis on Organic Waste: Understanding The Effect of Delignification and Particle Size

Cited by 2 publications

References 32 publications

Delignification of Cassava Peel by Using Alkaline Hydrogen Peroxide Method: Study of Peroxide Concentration, Solid/Liquid Ratio, and pH

Delignification of Cassava Peel by Using Alkaline Hydrogen Peroxide Method: Study of Peroxide Concentration, Solid/Liquid Ratio, and pH

Optimization of xylitol production through Candida tropicalis in xylose hydrolysate from rice husk

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