Lukhi Mulia Shitophyta
@uad.ac.id
Universitas Ahmad Dahlan
RESEARCH, TEACHING, or OTHER INTERESTS
Chemical Engineering, Renewable Energy, Sustainability and the Environment, Environmental Science, Ecology
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Lukhi Mulia Shitophyta¹, Hilda Dyah, Ana Wulansari and Azim Khan
University of the Aegean
<p>The biogas production of pretreated corn stover has been determined in different soaking durations. Batch anaerobic digestion applies three different soaking durations in sulfuric acid pretreatment under room temperature. The study aimed to probe the effect of soaking durations during sulfuric acid pretreatment. The experiment was conducted in 600 mL digesters at room temperature. Biogas volume was measured using the water displacement method every three days. The observed cumulative biogas yields varied between 48.74 mL/g VS and 99.95 mL/g VS. The highest biogas yield was obtained when corn stover was soaked in sulfuric acid for 6 hours. The 24 h-pretreated corn stover got the lowest biogas yield. The statistical result proved a significant effect of soaking durations on biogas production (p &lt; 0.05). The logistic model provided a better fit than the first-order model, with R2 values ranging from 0.9923 to 0.9987 and divergence between experimental and predicted values varying between 0.12% and 1.48%.</p>
Gita Indah Budiarti, Endah Sulistiawati, Titisari Juwitaningtyas, Lukhi Mulia Shitophyta, Irene Enjeli Purba, and Seila Setiyani
Institute of Advanced Engineering and Science
Consumption of noodles in the world is always increasing. Noodles made from wheat flour are unhealthy because they cause diabetes, so alternative noodles are needed, such as modified cassava flour and seaweed. Modification cassava is used because it does not contain gluten and seaweed has nutritional value to make healthy, low-calorie noodles. The purpose of this study was to determine the temperature and time of the drying parameters of seaweed noodles. The drying method uses an oven with variable temperature (60, 70, 80, and 90 ) and drying time (2, 4, 6, 8, and 10 hours). The results of the study obtained optimal water content at 60 with 6 hours of 11.75%. The drying kinetics evaluated by logarithmic equation, optimal drying constant value at 80 of 0.67 h<sup>-1</sup> with R2 0.9391. Effective moisture diffusivity (D<sub>eff</sub>) maximum evaluated by second Fick law obtained 9.35×10<sup>7</sup> m<sup>2</sup>/sec at temperature 90 with R2=0.9227. The proximate value of ash content is 12.11%, protein is 9.46%, lipid is 0.10%, and carbohydrates is 65.08%.
Zahrul Mufrodi, L. M. Shitophyta, Hary Sulistyo, . Rochmadi, and Muhammad Aziz
Ital Publication
Chemical phenomena involving three phases (solid, liquid, and gas) are often found in the industry. Carbonate (CaCO3) is widely used in industries as a powder-making material in the cosmetic industry, a pigment in the paint industry, and filler in the paper and rubber industry. This research aim to study the ordering process carbonate deposits (CaCO3) from the absorption process of CO2 gas with Ca(OH)2 suspension. The absorption reaction of CO2 gas with Ca(OH)2 suspension was carried out in a stirred slurry tank reactor. Initially, the reactor containing water was heated to a certain temperature, then Ca(OH)2 was added to the reactor. Furthermore, CO2 gas with a certain flow rate and temperature (according to the reactor temperature) is flown with the help of a gas distributor. Samples were taken every 1 min until the concentration of Ca(OH)2 could not be detected (completely reacted). The variables in this study were: stirrer rotation speed (5.66711.067 rps), CO2 gas flow rate (34.0127–60.5503 c/s), and temperature (30–50°C). The mass transfer coefficient and the reaction rate coefficient were determined by minimizing Sum of Squares of Errors (SSE). This experimental process follows a dynamic regime. A dimensionless number relationship for the gas-liquid mass transfer for the value range is Re1 = 18928.76-38217.20, Sh = 0.07928 Reg0.4383 Rel0.4399 Sc0.6415 with an error of 5.19%. The dimensionless number relationship for solid-liquid mass transfer is Sh = 0.0001179 Reg0.4674 Rel0.5403 Sc1.444 with an error of 7.31%. The relationship between the reaction rate constant and the temperature in the 30-50 °C range can be approximated by the Arrhenius equation, namely kr = 1771000 e-2321.4/T cm3/mgmol/s with an error of 3.63%. Doi: 10.28991/ESJ-2023-07-02-02 Full Text: PDF
Lukhi Mulia Shitophyta, Adi Permadi, and Syaeful Akbar Padya
AIP Publishing
Shitophyta Lukhi Mulia, Arnita Arnita, and Wulansari Hilda Dyah Ana
Czech Academy of Agricultural Sciences
Lukhi Mulia Shitophyta, Septia Riskillah Putri, Zienmy Ayu Salsabiella, Gita Indah Budiarti, Fatima Rauf, and Azim Khan
HARD Publishing Company
The green mustard residues can be converted into biogas through anaerobic digestion. In this study, different dilution volumes (1 L, 1.5 L, 2 L) were observed to determine the effect of dilution volumes on biogas yield. Three kinetic models (first-order, Fitzhugh, modified Gompertz model) were used to simulate the methane potential, kinetic constants, and lag phase time. The experiment was carried out in 5 L digesters at room temperature. The results showed that modified Gompertz is the best model for simulating the AD process. Dilution volume affected biogas production (p<0.05) with the highest biogas yield of 4372.58 mL/gVS (dilution volume of 2 L). The statistical analysis showed a significant correlation between the COD total, different dilution volumes and theoretical methane potential (p<0.05).
Lukhi Shitophyta, Syaeful Padya, Ahmad Zufar, and Novia Rahmawati
Wydawnictwo Naukowe Gabriel Borowski (WNGB)
Anaerobic digestion of food waste is an encouraging technology for biogas production. Pretreatment of the substrate is needed to increase biodegradation. This study aimed to investigate the effect of alkali pretreatment and organic solvent pretreatment on biogas production. Physical pretreatment was also applied in this study. NaOH (0%, 2%, 4% and 6%) was used as alkali pretreatment. Ethanol (0, 2, 4 and 6%) was used as organic solvent pretreatment. The experiment was conducted in a 1 L batch digester under room temperature. Results showed that 0% NaOH generated the highest cumulative biogas yield of 46.1 mL/gVS. The best biodegradability of 37.5% was achieved in NaOH of 0%. The lower concentration of ethanol generated a higher biogas yield. The greatest cumulative yield of 41.5 mL/gVS was obtained at an ethanol concentration of 0% with a biodegradability of 33.84%. Statistical analysis proved that alkali pretreatment and organic solvent pretreatment had no significant effect on biogas production (p>0.05). Physical pretreatment had a significant effect (p<0.05) with the highest cumulative yield of 58.2 mL/gVS. The kinetic model proved that the modified Gompertz was a suitable model for predicting and simulating the kinetics of anaerobic digestion from food waste (R 2 > 0.9).
L M Shitophyta, G I Budiarti, Y E Nugroho, and M Hanafi
IOP Publishing
Abstract Biogas production from various organic wastes such as corn stover can be used as an alternative fuel. Corn stover is one of the agricultural wastes that are widely generated in Indonesia. It contains cellulose which has the potential to be used as raw material for producing biogas. The biogas production process was carried out in solid-state anaerobic digestion (SS-AD), i.e., a biological process that occurs naturally by a microorganism that breaks down molecules of organic material with a total solid content greater than 15%. This research was aimed to investigate the effect of EM-4 concentration on biogas yield. The volatile solids (VS) reduction was also measured in this study. The results of the study showed that EM-4 concentration had a significant effect on biogas yield (p < 0.05). The positive linear relationship was found between EM-4 concentration and biogas yield. The highest biogas yield of 597.98 L/kg VS was obtained at EM-4 15%. The main source of biogas production during SS-AD of corn stover was the reduction of VS.
L M Shitophyta and Maryudi
IOP Publishing
Energy demand increases every day, while the energy source especially fossil energy depletes increasingly. One of the solutions to overcome the energy depletion is to provide renewable energies such as biogas. Biogas can be generated by corn cob and food waste. In this study, biogas production was carried out by solid-state anaerobic digestion. The steps of biogas production were the preparation of feedstock, the solid-state anaerobic digestion, and the measurement of biogas volume. This study was conducted on TS content of 20%, 22%, and 24%. The aim of this research was to compare kinetic models of biogas production from corn cob and food waste as a co-digestion using the linear, exponential equation, and first-kinetic models. The result showed that the exponential equation had a better correlation than the linear equation on the ascending graph of biogas production. On the contrary, the linear equation had a better correlation than the exponential equation on the descending graph of biogas production. The correlation values on the first-kinetic model had the smallest value compared to the linear and exponential models.
Kusmiyati and Lukhi Mulia Shitophyta
AIP Publishing LLC
An increased of human need that spend a lot of energy, especially fuel resulting in excessive energy consumption. Therefore, the existence of alternative energy that renewable and environmentally friendly, such as bioethanol is required. In this study the use of sorghum and iles-iles as raw materials for bioethanol production were investigated. The variables studied were the saccharification time, weight of dry yeast Saccharomyces cerevisiae added in the starter culture (2.5, 5, 10, 15, 20 g) and fermentation temperature (30, 35, 40, 45, 50°C). Bioethanol production consisted of the enzymatic hydrolysis (liquefaction and saccharification), and fermentation. For liquefaction, 1.6% v/w α-amylase enzyme, 1 hour, T = 95-100° C, pH 6 were used. For saccharification, 3.2% v/w b-amylase enzyme, time 4,8,24,48 hours, T = 60°C, pH 5 were used. For fermentation, Saccharomyces cerevisiae yeast were used with conditions of time for 120 hours, pH 4.5. The effect of dry yeast weight and fermentation temperature indicated that 15 g yeast weight and temperature 30° C were found to be the best condition which resulted the highest ethanol concentration of 85.20 g/L and 79.94 g/L for sorghum and iles-iles flour, respectively.An increased of human need that spend a lot of energy, especially fuel resulting in excessive energy consumption. Therefore, the existence of alternative energy that renewable and environmentally friendly, such as bioethanol is required. In this study the use of sorghum and iles-iles as raw materials for bioethanol production were investigated. The variables studied were the saccharification time, weight of dry yeast Saccharomyces cerevisiae added in the starter culture (2.5, 5, 10, 15, 20 g) and fermentation temperature (30, 35, 40, 45, 50°C). Bioethanol production consisted of the enzymatic hydrolysis (liquefaction and saccharification), and fermentation. For liquefaction, 1.6% v/w α-amylase enzyme, 1 hour, T = 95-100° C, pH 6 were used. For saccharification, 3.2% v/w b-amylase enzyme, time 4,8,24,48 hours, T = 60°C, pH 5 were used. For fermentation, Saccharomyces cerevisiae yeast were used with conditions of time for 120 hours, pH 4.5. The effect of dry yeast weight and fermentation temperature indicat...
Lukhi Mulia Shitophyta, Budiyono, and Ahmad M. Fuadi
AIP Publishing LLC
Biogas production from lignocellulosic biomass can be used as an alternative fuel to replace fossil fuels. Lignocellulose can be obtained from agricultural crop residues, such as rice straw. The aims of this study were to determine the effects of F/I ratio, total solid content, and physical pretreatment on biogas production by solid-state anaerobic digestion. The kinetics of biogas production were also examined in this study. The results showed that the biogas yield decreased by the increasing of F/I ratio. Meanwhile, the increase TS content of 22% to 24% also decreased the biogas yield. Physical pretreatment had no a significant effect on biogas yield (p > 0.05). The highest biogas yield of 248.4 L/kg VS was obtained at an F/I ratio of 2, TS content of 22%, and particle size of 2 mm. The kinetics of biogas production from rice straw followed the first-order kinetic model with the highest rate constant (k) of 0.0861 day−1.