nan Muryanto

Pretreatment of Sweet Sorghum Bagasse Using EFB-Based Black Liquor for Ethanol Production

Lignocellulose-based bioethanol provides one potential alternative energy. Pretreatment is one of the steps in the bioconversion of lignocellulose material. Pretreatment also contributes the largest cost in the bioethanol production and produces black liquor as a wastewater which provides environmental impacts. In order to improve the cost-effectiveness of bioethanol production, the black liquor from empty fruit bunch (EFB) pretreatment was collected and used for pretreatment of sweet sorghum bagasse (SSB). The pretreatment process was conducted in a 5-liter reactor at 150 °C. The result by using black liquor was compared with pretreatment by using NaOH solution. The delignification of SSB by using black liquor in 30 and 60 min pretreatment time was 61.57% and 55.87%, respectively. The ethanol production after the SSF process reached 45.06 gl−1 and 46.49 gl−1.

Optimization pretreatment condition of sweet sorghum bagasse for production of second generation bioethanol

The bagasse residue of Sweet sorghum (Sorghum bicolor (L.) Moench) consist of cellulose 39.48%; hemicellulose 16.56% and lignin 24.77% that can be converted to ethanol. Pretreatment is of great importance to ethanol yield. In this study, pretreatment process was conducted in a 5-liter reactor using NaOH 10% at various temperature 110, 130, 150°C and reaction time 10, 20, 30 minutes and optimizing severity parameter (log R0 between 1.3 - 2.9). The statistical analysis using two way anova showed that third variations of temperature give different effects significant on lignin, hemicellulose and cellulose content at 95% the confidence level. The optimum pretreatment of bagasse sorghum were obtained with Log R0 value between 2.4-2.9. High severity value in pretreatment condition reduce lignin almost 84-86%, maximum reducing lignin content was 86% obtained at temperature 150°C for 20 minutes reaction time and cellulose increased almost two times the initial content.The bagasse residue of Sweet sorghum (Sorghum bicolor (L.) Moench) consist of cellulose 39.48%; hemicellulose 16.56% and lignin 24.77% that can be converted to ethanol. Pretreatment is of great importance to ethanol yield. In this study, pretreatment process was conducted in a 5-liter reactor using NaOH 10% at various temperature 110, 130, 150°C and reaction time 10, 20, 30 minutes and optimizing severity parameter (log R0 between 1.3 - 2.9). The statistical analysis using two way anova showed that third variations of temperature give different effects significant on lignin, hemicellulose and cellulose content at 95% the confidence level. The optimum pretreatment of bagasse sorghum were obtained with Log R0 value between 2.4-2.9. High severity value in pretreatment condition reduce lignin almost 84-86%, maximum reducing lignin content was 86% obtained at temperature 150°C for 20 minutes reaction time and cellulose increased almost two times the initial content.

Potential of oil palm empty fruit bunches for bioethanol production and application of chemical methods in bioethanol wastewater treatment : OPEFB for bioethanol and its wastewater treatment

Lignocellulosic-based bioethanol is providing one window of potential alternative energy. Pretreatment is one of the steps in the bioconversion of lignocellulosic material. The pretreatment process was conducted in a 5-liter reactor at 150 °C, 4 bars of pressure during 30 minutes. The SSF was carried out using 30 FPU cellulase enzyme and yeast Saccharomyces cerevisiae. The delignification of pretreatment reached 64.58%. The ethanol production after SSF process reached 62 gl−1. The black liquor wastewater can be effectively treated by using chemical methods consist of coagulation-flocculation, Fenton, and adsorption. These processes have able to remove COD, TSS, and color more than 80%.