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ASEAN Journal of Chemical Engineering
Published by Universitas Gadjah Mada
ISSN : 26555409     EISSN : 26555409     DOI : https://doi.org/10.22146/ajche.52004
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry
The ASEAN Journal of Chemical Engineering publishes papers on Chemical Engineering, specifically but not limited to the areas of thermodynamics, reaction kinetics, transport phenomena, process control, environment, energy, biotechnology, corrosion, separation science, powder technology, materials science, and chemical engineering education
Arjuna Subject : Teknik Kimia (semua kategori) - Kimia Proses dan Teknologi
Articles 6 Documents
 1 
Search results for , issue "Vol 3, No 1 (2003)" : 6 Documents clear
Application of Autotrophic Denitrification to Nitrate-Contaminated Industrial Wastewater Rudi Nugroho; Hirokazu Takanashi; Makoto Hirata; Tadashi Hano
ASEAN Journal of Chemical Engineering Vol 3, No 1 (2003)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (396.18 KB) | DOI: 10.22146/ajche.50853

Abstract

An autotrophic denitrification system was applied to the treatment of industrial wastewater with very low C/N ratio. The experiments were conducted by both batch suspension and continuous column runs. The denitrification behavior in suspension runs obeyed the first-order reaction with the rate constants k1and k2 of 0.014 and 0.004 m3fg-SS-d, respectively. In the continuous runs, a column was packed with a mixture of granular sulfur and limestone. The microbes mostly composed of Thiobacillus denitrificans attached on the surface of sulfur particles like biofilm with an approximate thickness of 100 1m. The denitrification rate in the packed column was expressed by a half-order equation with the rate constant of 0.172 g-Nl/2- ml/2f(kg-S d). Lower denitrification extent of industrial wastewater compared with synthetic wastewater was concluded to be caused by the lack of alkalinity.Key Words: Autotrophic denitrification, Sulfur, Limestone, Packed column, Thiobacillus denitrificans
Steam Reforming of Methanol Over Cu/Al203/ZnO Catalysts Somchai Akaratiwa; Tammanoon Udomman
ASEAN Journal of Chemical Engineering Vol 3, No 1 (2003)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (238.029 KB) | DOI: 10.22146/ajche.50854

Abstract

In this research, steam reforming of methanol over Cu/Al2O3/ZnO catalysts was investigated. The catalysts were prepared by conventional co-precipitation and  sequential precipitation methods. Especially, the sequential precipitation method were performed by varying the sequence of additions of copper, aluminum, and zinc nitrate solutions. The experimental results showed clearly that the preparation methods affected the performance of catalysts. The Cu/AI2O3/ZnO catalysts  prepared by consecutively adding copper, aluminum, and zinc nitrate solutionsexhibited better performance. The effect of Al2O3/ZnO molar ratios on the activity of catalysts was also studied. It was found that the catalysts with 50:5:45 of Cu/AI2O3/ZnO molar ratio showed higher activity than others. In order to improve catalytic activity, Mn- or Cr-promoted over Cu/Alp.jZnO was also investigated. It was interesting to observe that either the Mn- or the Cr-promoted Cu/AI2O3/ZnO catalysts have higher activity than nonpromoted ones, indicating that Mn and Cr promoters give some synergistic effect.
Efect of pH on Growth, Spore Production and Spore Viability of Biocontrol Agent Trichoderma Harzianum in Submerger Fermentation Syahiddin Dahlanr Said; Masitah Hasan; K.B Romachandran
ASEAN Journal of Chemical Engineering Vol 3, No 1 (2003)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (254.48 KB) | DOI: 10.22146/ajche.50855

Abstract

The effect of pH medium on growth, spore production and spore viability of bicontrol agent Trichoderma harzianum were investigated in a batch farmenter in the range of 4 to 7. The biomass concentration of this fungus at pH 4,6 and uncontrolled pH were higher than at pH 5 and 7 after 18h incubation. The spore produced by the fungus at 6,7 and uncotrolled pH was higher than others. the highest level of spore production (6.67x107 spores/ml) occured at unctrolled pH, but the spore produced in the culture grown at 7 has a higher viability (52,5%) compared to those grown at other pH.
Kinetic Analysis of Phenol Biodegradation by Isolated Bacteria and Mixed Culture by Cells Immobilized on Loofa (Lugga Cylindrica) Sponge in Airlift Bioreactior Faisal Faisal; Yasunori Tanji; Hajime Unno
ASEAN Journal of Chemical Engineering Vol 3, No 1 (2003)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (322.579 KB) | DOI: 10.22146/ajche.50856

Abstract

Varios contaminated soil samples were examined for isolation of microorganisms responsible for phinol degradation. One type pure culture gram positive bacterua was isolated and identified as Bacillus pulvifaciens. isolated bacteria and an activated sludge were acclimated for 75 days to a medium containing phenol is a speratae 250 ml Erlenmeyer flasks. After this period of time, biomass was transferred into airlift bioreactor with looga sponge for cells immobilization and acclimation which was operated by fill and draw moder faro 70 days. The immobilized cells gres wthin the void space of the loofa spongem reaching a high cells concentration of 21.4 g-calees/l-sponge volume and the free cells in the effluent became arround of 0.7 g/l. The performance of airlift bioreactir for 27 hours operation after acclimation period, showed that decrease in phenol concentration after 24th hour culture with isolated bacteria and the activated sludge culture were 99.8% and 84,2% removal, respectivaly. The phenol and COD degradation by the isolated bacteria was higher than that of the activated sludge culture. Based on the experimental data, kinetic model was discussed. through the model the biokinetic paramters were evaluated, which represented the behavior of eractor very well.
Avoiding Chaotin Instability under PID Control of Plythylene Fluidized Bed Reactor (UNIPOL Procees) Nayef Mohamed Ghasem; Mohamed Azlan Hussain
ASEAN Journal of Chemical Engineering Vol 3, No 1 (2003)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (348.95 KB) | DOI: 10.22146/ajche.50857

Abstract

Modeling investigation showed that static and dynamic bifurcation behavior covers wide regions of the design and operatin domain of the fluidized bed reactor for polythylene production. In some cases, if comes across that the optimum static state is unstable and surrounded by a periodic branch with large tempertature oscillations causing fomidably high termperature far above the melting point of the polymer. A proportional-derivative-integral controller has been investigated for the stabilization of these desirableunstable steady states and the characteristic of the closed loop control system are presented and discussed. Even under the PID control scheme it was observed that care should be taken dor selecting suitable control gain to avoid instability.
Characterization of Titania (TiO2) Catalysts Prepared by Sol-Gel Method Marwan Marwan; Naoto Azuma; Akinori Maezawa; Shigeo Uchida
ASEAN Journal of Chemical Engineering Vol 3, No 1 (2003)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (456.757 KB) | DOI: 10.22146/ajche.50858

Abstract

Various TiO2 catalysts in powder form were prepared ny sol-gel method and then characterized for X-ray diffraction and BET surface area. VAriation in composistion of reactants, choice of hydrolysing catalyst, calcination temperature, and method of drying were among preparative variable evaluated. Addition Pt, Fe2O3, CuO and SiO2 on the catalysts was also carried out during the initial stage of sol formation. XRD analysis suggest that all catalysts calcined at 450'C were compeltelu in anatase phase. BET surface area of the catalysts revealed that the catalysts prepared using HNO3 as hydrolysing catalyst, have a surface area larger than the commercial Degussa P25 TiO2 catalyst, with the highest area of 126m2/g. The addition of metals resulted in a lower surface area, while silica provided a considerable incdease in surface area, at 257 m2/g. Analyses of isotherms plot and BJH desorption plots suggest that particle pores were dominated by a bottle-like share. However, the photocalatylstic activity of these catalysts in te degradation of sufactant failed to meet the perfomance rating of Degussa P23 TiO2 catalyst, probably due to less access of surfactant into interbal surface of the prepared catalysts. Degradation of the surfactant usidng different particle sizes suggests that the external surface of TiO2 catalysts was important under liquid phase degradation.

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