vol. 3 no. 1 (2003)

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This is the third issue of the ASEANJournal of ChemicalEngineering (AJChE).This journal is primarilyintended to serve as vehiclefor the disseminationof research outputs and/or innovationsdeveloped in the fieldof chemicalengineeringby researchersfromthe ASEAN region. Since the publication of the maiden issue of the AJChE, the Editorial Board has noted an increasingnumber of papers being submittedfor publication not only from the ASEANnations but also from some non-ASEAN countries. The overlNhelming response to our invitationfor papers is very encouraging.We would liketo consider this continually growing number of researchers responding positivelyto our call as a very optimisticsign that this journal can be sustained in the years to come. It is heartening to note that our previous issuesalready have carriedpapers pertaining to various aspects of chemicalengineering- topics such as thermodynamics, reaction kinetics, transport phenomena, processcontrol, environment, energy, biotechnology, corrosion,recyclingand other relevant topics.

In this issue we have six (6) technical papers. The authors of these papers are from Japan, Thailand, Malaysia, and Indonesia. These papers discuss issues about industrial wastewater treatment, steam reforming of methanol over catalysts, effects of biocontrol agent using a batch fermenter, kinetic analysis of phenol biodegradation, modeling investigation under PID control of polyethylene fIuidised bed reactor, and lastly, characterization of titania catalysts prepared by sol-gel method. The articleentitled "Application of Autotrophic Denitrification Nitrate-Contaminated to Industrial Wastewater" by R. Nugroho, H. Takanashi, M. Hirata and T. Hanodiscusses the autotrophic denitrification system as applied to the treatment of industrialwastewater with very low C/N ratio. Lack of alkalinityis one of the reasons for the lower degree of denitrificationnoted in the treated industrial wastewateras compared to that observed for synthetic wastewater.

Akaratiwaand T.Udomman discuss the importance of catalyst preparation methods in theirarticleentitled" Steam Reforming of Methanolover CuiAI20. JznO Catalysts". Their conclusion is that either the Mn-or the Cr-promotedCulAI20.jZnOcatalystshave higher activity than non-promoted catalysts indicating that Mn and Cr promoters give some synergisticeffect.

The paper of S. D. Said, M. Hasan and K.B. Ramachandran entitled "Effectof pH on Growth, Spore Production and Spore Viabilityof Biocontrol Agent Trichoderma Harzianum in Submerged Fermentation" is directed towards optimizing the operating conditions for maximizing the spore production with high viability in submerged fermentation. Specifically, the highest level of spore production is 6.67 x 107spores/ml occurringat uncontrolledpH value, but the spores produced in the culture grown at pH 7 have a higher viabilitythan those grown at other pH values.

"KineticAnalysisof Phenol Biodegrationby IsolatedBacteria and MixedCulture by CellsImmobilizedon Loofa (LuffaCylindrica)sponge in AirliftBioreactor"isthe titleof the paper jointly authored by Y. Tanji, H. Unno, and Faisal. The paper discusses the biodegradationofphenol by the isolated bacteria Bacillus Pulvifaciens and activatedsludge acclimated to a phenol-containing medium. The biomass is transferred into an airlift bioreactor with loofa sponge for cells immobilization and acclimation. The study also involvesthe developmentofa kineticmodeland the evaluationofthe biokineticparameters N. M. Ghasem and M. A. Hussain discussa proposed mathematicalmodel in the article entitled "AvoidingChaotic Instabilityunder PID Control of PolyethyleneFluidized Bed Reactor (UNIPOLProcess)".The modelinginvestigationshows that wide regions are covered by the static and the dynamic bifurcation behaviors in the design and in the operating domain of the fluidizedbed reactor forpolyethyleneproduction. In the selection of a suitable control gain, care should be taken to avoid instabilityeven under the PID controlscheme.

The article entitled "Characterizationof Titania (Ti02)CatalystsPrepared by Sol-Gel Method" by Marwan, A. Ueno, N. Azuma, A. Maezawa, and S. Uchida discusses the preparation of titania catalysts by the sol-gel method. The variables utilized are water quantity, synthesiscatalyst, calcination temperature, drying method, and choice of metal additive. It is noted that the degradation of the surfactantof Ti02 catalystsis an important factor to be considered under liquidphase degradation. As parting words, we would like to reiterate that we are continuously accepting papers for possible publication in the next issues of the AJChE. Likewise, comments about any article or information published in this journal are most welcome.


Table of Contents


Application of Autotrophic Denitrification to Nitrate-Contaminated Industrial Wastewater Abstract Full Text
Rudi Nugroho , Makoto Hirata, Tadashi Hano, Hirokazu Takanashi 1-8
Steam Reforming of Methanol Over Cu/Al203/ZnO Catalysts Abstract Full Text
Somchai Akaratiwa, Tammanoon Udomman 9-13
Efect of pH on Growth, Spore Production and Spore Viability of Biocontrol Agent Trichoderma Harzianum in Submerger Fermentation Abstract Full Text
Syahiddin Dahlanr Said, Masitah Hasan, K.B Romachandran 14-18
Kinetic Analysis of Phenol Biodegradation by Isolated Bacteria and Mixed Culture by Cells Immobilized on Loofa (Lugga Cylindrica) Sponge in Airlift Bioreactior Abstract Full Text
Faisal , Yasunori Tanji, Hajime Unno 19-25
Avoiding Chaotin Instability under PID Control of Plythylene Fluidized Bed Reactor (UNIPOL Procees) Abstract Full Text
Nayef Mohamed Ghasem, Mohamed Azlan Hussain 26-33
Characterization of Titania (TiO2) Catalysts Prepared by Sol-Gel Method Abstract Full Text
Marwan , Naoto Azuma, Akinori Maezawa, Shigeo Uchida 34-42