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All Journal International Journal of Renewable Energy Development Jurnal Bahan Alam Terbarukan Journal of Engineering and Technological Sciences
Wahyudi Budi Sediawan
Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada, Jl. Grafika No.2 Yogyakarta 55281, Indonesia, Telp.(+62274) 561176
Chemistry Energy Engineering Materials Science & Nanotechnology

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SINTESIS BIOADITIF GASOLINE MELALUI KETALISASI GLISEROL MENGGUNAKAN KATALISATOR PADAT Nuryoto, Nuryoto; Sulistyo, Hary; Sediawan, Wahyudi Budi; Perdana, Indra
Jurnal Bahan Alam Terbarukan Vol 5, No 2 (2016): December 2016 [Nationally Accredited]
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v5i2.7431

Abstract

Utilization of glycerol side product from biodiesel as waste management application is required for reduced   negative effect which possible emerged. Glycerol  have three bond of hydroxyde, so its  opportunity  to utilize  to be solketal as bio-additive of gasoline. Indion 225 Na ion exchanger resin is strong acid cation category and low  prices, so  its potency to use alternatively of solid catalyst to get efficient and economic process. The purpose of this research was focussed to search  of the best condition by optimalization indion 225 Na performance as catalyst in glycerol ketalization reaction, by integrated of variables that have effected to reaction for maximize glycerol coversion. To get maximize of reactants molecular interaction and for  optimalization indion 255 Na performance, observation  conducted  in the  range variables which widely enough that were  reactant ratio of 5:1-6:1 mole of acetone mole/mole of glycerol, diameter size  catalyst of  20-40 mesh, catalyst concentration of 3-5% mass of acetone, and reaction temperature of 35-65oC. Result of the research showed that  indion 225 Na catalyst have good performance, by glycerol conversion to reach of 51.89%. Glycerol conversion mentioned was obtained at reactant ratio of 6:1 mole of acetone/mole of gycerol, diameter size catalyst of  40 mesh, catalyst concentration of 4%  mass of acetone, and  reaction temperature of  65oC.
MODIFICATION OF IRON OXIDE CATALYSTS SUPPORTED ON THE BIOMASS BASED ACTIVATED CARBON FOR DEGRADATION OF DYE WASTEWATER Amelia, Shinta; Sediawan, Wahyudi Budi; Mufrodi, Zahrul; Ariyanto, Teguh
Jurnal Bahan Alam Terbarukan Vol 7, No 2 (2018): December 2018 [Nationally Accredited]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v7i2.17174

Abstract

Methylene blue is one of the dyes in textile industries which has a negative impact on the environment. This compound is very stable, so it is difficult to degrade naturally. Methylene blue can be harmful to the environment if it is in a very large concentration, because it can increase the value of Chemical Oxygen Demand (COD) which can damage the balance of environment ecosystem. Adsorption method by using activated carbon as the adsorbent is one of the most efficient and effective techniques in dye removal due to its large adsorption capacity. However, the adsorption method using activated carbon only removes the pollutant compounds to other media or phases. Other method that can be used includes Advanced Oxidation Processes (AOPs). This method has the advantage of being able to degrade harmful compounds in the waste through oxidation (oxidative degradation) processes. One method of AOPs is the process by using Fenton reagents. This study was aimed to prepare and characterize iron oxide/porous activated carbon catalyst. The type of porous activated carbon used was carbon from biomass derived carbon with microporous character. This biomass carbon is obtained from renewable natural products, namely coconut shell.The kinetics and adsorption models in the material will be derived and evaluated from the research data. Based on the research, it can be concluded that catalytic degradation is very effective for degradation of dye wastewater. Methylene blue degradation increases with the use of Fe2O3/activated carbon catalyst and the addition of hydrogen peroxide as the Fenton reagent. In addition, the pore structure difference in the catalyst also had a significant effect on the methylene blue degradation reaction resulting in increased capacity of methylene blue degradation reactions.
Comparison of Formulation Methods to Produce Nano-Chitosan as Inhibitor Agent for Bacterial Growth Nugraheni, Prihati Sih; Soeriyadi, Alexander H.; Ustadi, Ustadi; Sediawan, Wahyudi Budi; Budhijanto, Wiratni
Journal of Engineering and Technological Sciences Vol 51, No 3 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.548 KB) | DOI: 10.5614/j.eng.technol.sci.2019.51.3.9

Abstract

Chitosan is known as an antibacterial agent. The effective surface area ratio of chitosan can be increased by modification into nanoparticles. Nano-chitosan can be prepared with several simple methods, i.e. precipitation, ionic gelation, or the polyelectrolyte complex method. This study compared these three methods in terms of the targeted product characteristics, i.e. stability of the average nanoparticle size as well as the colloidal dispersion, and the antibacterial characteristics. All three methods resulted in nanoparticle formation, but in the precipitation method significant zeta potential reduction was observed due to the presence of negative ions from the alkali that neutralized the chitosan amine group. The ionic gelation method yielded higher zeta potential and higher inhibition of bacterial growth than those yielded by the polyelectrolyte complex method. Ionic gelation and the polyelectrolyte complex method resulted in much better colloidal dispersion stability than the precipitation method, where a significant particle size increase was observed after one week of storage. This result indicates that both ionic gelation and the polyelectrolyte complex method can be used for forming nano-chitosan for the purpose of food preservation. However, for fishery products it is advisable to use the polyelectrolyte complex method because the TPP usually used in ionic gelation is not allowed to be applied to fish.
Kinetics of Sulfide Removal in Biofilter Employing Sulfur-Oxidizing Bacteria on Salak Fruit Seeds Lestari, Retno Ambarwati Sigit; Sediawan, Wahyudi Budi; Sarto, Sarto
Jurnal Bahan Alam Terbarukan Vol 8, No 2 (2019): December 2019 [Nationally Accredited - Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v8i2.22356

Abstract

Sulfur-oxidizing bacterias were isolated then grown on salak fruit seeds forming bio-film. Their performances in sulfide removal were experimentally observed. The salak fruit seeds were then used as packing material in a cylinder. Liquid containing 83 ppm of sodium sulfide was flown through the bed. Then the sulfide concentrations in the outlet at various times were analyzed. A set of simple kinetics model for the rate of the sulfide removal and the bacterial growth was proposed. The axial sulfide concentration gradient in the flowing liquid are assumed to be quasi-steady-state. Mean while the bio-film grows on the surface of the seeds and the sulfide oxidation takes place in the bio-film. Since the bio-film is very thin, the sulfide concentration in the bio-film is assumed to be uniform. The simultaneous ordinary differential equations obtained were then solved numerically using Runge-Kutta method. The accuracy of the model proposed was tested by comparing the calculation results using the model with the experimental data obtained. It turned out that the model proposed can be applied to quantitatively describe the removal of sulfide in liquid using bio-filter in packed bed. The values of the parameters were also obtained by curve-fitting.
Biohydrogen Production by Reusing Immobilized Mixed Culture in Batch System Damayanti, Astrilia; Sarto, Sarto; Sediawan, Wahyudi Budi
International Journal of Renewable Energy Development Vol 9, No 1 (2020): February 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.1.37-42

Abstract

Biohydrogen production via dark fermentation is a prospective renewable energy technology. In the process, reused of immobilized mixed culture is very important as their activities greatly influencehydrogen production. The aim of this work was to evaluate the reuse of alginate beads affecting the biohydrogen production for 45 days. This study in batch reactor were performed using glucose 10 M as substrate, alginate and activated carbon as immobilization matrix materials, chicken eggshell as buffer, and cow dung biodigester as mixed culture. Hydrogen and pH on fermentation product are investigated by gas chromatography (GC) technique and pH meter, respectively. The colony diameter on immobilized and co-immobilized mixed culture was observed using optical microscope and colony diameter was measured using Image-Pro Plus Software v4.5.0.29. The surface morphology of immobilization and co-immobilization beads were determined using scanning electron microscope (SEM). The results showed that the colonies growth observed using optical microscopy or SEM was apparent only in the immobilization of mixed culture. The average growth and diameter of colonies per day were 90 colonies and 0.025 mm, respectively. The weight of beads and pH during the 45-day fermentation process for bead immobilization of mixed culture were 1.32–1.95 g and 6.25–6.62, correspondingly, meanwhile, the co-immobilizations of the mixed culture were 1.735–2.21g and 6.25–6.61, respectively. In addition, the average hydrogen volume of glucose fermented using an eggshell buffer and reusing the immobilization and co-immobilization beads was 18.91 mL for 15 cycles.©2020. CBIORE-IJRED. All rights reserved
Co-Authors Amelia, Shinta Astrilia Damayanti Hary Sulistyo Indra Perdana Nugraheni, Prihati Sih Nuryoto Retno Ambarwati Sigit Lestari Sarto Soeriyadi, Alexander H. Teguh Ariyanto Ustadi, Ustadi Wiratni Budhijanto Zahrul Mufrodi, Zahrul