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All Journal Jurnal Bioteknologi & Biosains Indonesia (JBBI) ASEAN Journal of Chemical Engineering Equilibrium Journal of Chemical Engineering International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Joko Waluyo
Chemical Engineering, Sebelas Maret University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Materials Science & Nanotechnology

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 1 
Modification of Natural Zeolite as a Catalystfor Steam Reforming of Toluene Joko Waluyo; Tobias Richards; IGBN Makertihartha; Herri Susanto
ASEAN Journal of Chemical Engineering Vol 17, No 1 (2017)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (993.264 KB) | DOI: 10.22146/ajche.49564

Abstract

A catalyst for tar cracking has been prepared successfully from natural zeolites using ion exchange with NH4NO3, and acid leaching with HNO3 solution for removing impurities and increasing pore volume. The activity of the modified zeolite was tested using toluene as a tar model compound. Tar conversion of about 54% was achieved in catalytic steam reforming at a temperature of 750C using 2 gram of catalyst and the gas hourly space velocity about 5040 h-1.
A REVIEW OF NANOCELLULOSE SYNTHESIS METHODS AND ITS APPLICATION Fuad Dimar Fauzi; Hafidz Dhany Wicaksono; Joko Waluyo
Jurnal Bioteknologi & Biosains Indonesia (JBBI) Vol. 10 No. 1 (2023): Juni 2023
Publisher : Balai Bioteknologi, Badan Pengkajian dan Penerapan Teknologi (BPPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jbbi.v10i1.5349

Abstract

Nanocellulose is a type of cellulose that is being widely developed to replace petroleum-based polymers. This material possesses biocompatible properties, is abundant in nature, and is eco-friendly due to its biodegradability, sustainability, and non-toxic nature. Various nanocellulose synthesis methods are employed, including acid hydrolysis, alkaline, mechanical and biological treatments, as well as ionic liquid and deep eutectic solvent methods. The choice of synthesis method greatly influences the particle size and crystallinity of the resulting nanocellulose; hence further investigation is needed to determine the effectiveness of these methods. Nanocellulose finds applications in various fields, such as films, polymers, cosmetics, medical fuels, and energy storage. Among the different nanocellulose synthesis methods, ionic liquid and deep eutectic solvent (DES) methods have environmentally safe waste with better temperature, time, and diameter control compared to other methods. However, the DES method is currently preferred over the ionic liquid method due to the possibility of separating the lignin waste from the solvent.
Thermodynamic Study of Palm Kernel Shell Gasification for Aggregate Heating in an Asphalt Mixing Plant Firman Asto Putro; Sunu Herwi Pranolo; Joko Waluyo; Ary Setyawan
International Journal of Renewable Energy Development Vol 9, No 2 (2020): July 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.2.311-317

Abstract

This study evaluated thermodynamically the performance of conversion of palm kernel shells into combustible gas through gasification technology for aggregate heating in a hot-mixed asphalt production plant by developing a thermodynamic model using licensed Aspen Plus v.11 software. The effects of the equivalence ratio (ER) in the gasification process and the amount of combustion air to combustible gas to attain the required aggregate temperature were investigated. The thermodynamic model showed a good agreement with the experimental results based H2 and CO contain in producer gas which provided by maximum root mean square errors value of 8.82 and 6.42 respectively. Gasification of 30–35 kg of palm kernel shells in a fixed-bed gasifier reactor using air as a gasifying agent at an ER of 0.325–0.350 generated gaseous fuel for heating 1 ton of aggregate to a temperature of 180–200°C with combustion excess air 10%–20%. 
Utilization of Modified Zeolite as Catalyst for Steam Gasification of Palm Kernel Shell Joko Waluyo; Petric Marc Ruya; Dwi Hantoko; Jenny Rizkiana; I.G.B.N. Makertihartha; Mi Yan; Herri Susanto
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 3 Year 2021 (September 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.3.10837.623-631

Abstract

Syngas from biomass gasification is being developed for alternative feedstock in the chemical industry. Palm kernel shell which is generated from palm oil industry can be potentially used as raw material for gasification process. The purpose of this study was to investigate the use of modified natural zeolite catalysts in steam gasification of palm kernel shells. Mordenite type zeolite was modified by acid leaching to be used as a tar cracking catalyst. Steam gasification was conducted at the temperature range of 750–850 °C and the steam to biomass ratio was in the range of 0–2.25. The result showed that steam gasification of palm kernel shell with the addition of zeolite catalyst at 750 °C and steam to biomass ratio 2.25 could reduce tar content up to 98% or became 0.7 g/Nm3. In this study, gasification of palm kernel shells produced syngas with the hydrogen concentration in the range of 52–64% and H2/CO ratio of 2.7–5.7. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
The Prospects and Challenges of Biopolymers for Enhanced Oil Recovery (EOR) Maudy Pratiwi Novia Matovanni; Muhammad Nur Ikhsanudin; Rizky Ibnufaatih Arvianto; Joko Waluyo; Sperisa Distantina; Mujtahid Kaavessina; Sunu Herwi Pranolo
Equilibrium Journal of Chemical Engineering Vol 7, No 1 (2023): Volume 7, No 1 July 2023
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v7i1.73947

Abstract

Abstract. Currently, Enhanced Oil Recovery (EOR) technology is being interested in the Indonesian state as an advanced technology that can recover oil remaining in the reservoir. The discovery of new resources and EOR efforts are predicted to result in increased oil production. This paper provides a review of main types of EOR methods, which are gas injection, thermal injection, and chemical injection; mechanism of polymer flooding; and biopolymer materials for EOR, attention were given to xanthan gum, cellulose, guar gum, and lignin. Polymer flooding is a low-cost chemical injection method with a high rate of success. Polymer flooding has several advantages, including improving oil recovery by minimizing residual oil saturation, decreasing water output from oil well, and requiring less water compared with water flooding. Since the use of polymer flooding in the EOR activities, there is a lot of potential that biopolymers are materials that play a significant role in the application of EOR technology, because environmentally friendly properties and have advantages over synthetic polymers. Biopolymer can be modified to nano materials or grafted with synthetic polymer to improve its properties and stability. It have shear, salinity, and temperature resistance, long-term stability, and large availability, so it making the right choice for applications in oil recovery.Keywords:Enhanced oil recovery, EOR, biopolymer, polymer flood, modification of biopolymer
Absorption of Tar Content in Producer Gas using Used Cooking Oil in a Packed-bed Column Firman Asto Putro; Joko Waluyo; Bahaul Fahmi Al Haq; Wahyu Nur Hidayat; Sunu Herwi Pranolo
Equilibrium Journal of Chemical Engineering Vol 7, No 1 (2023): Volume 7, No 1 July 2023
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v7i1.70383

Abstract

Abstract. The tar content in producer gas may cause crusting on the engine if it is utilized as a fuel gas, thus it needs to be removed. This study aims to determine the liquid phase mass transfer coefficient in process of removing tar from producer gas in a packed-bed contactor column. This process is carried out continuously using used-cooking oil as absorbent. This was carried out by contacting the producer gas as a product of cacao pod-husk gasification at temperature range of 491-940°C at a certain counter-current flow rate with used-cooking oil in a column with a Raschig ring packing bed. The study used packed-bed materials with specific surface areas of 29.3927 m²/m³, 49.7532 m²/m³, 95.4113 m²/m³, 96.8182 m²/m³, 101.6840 m²/m³, and 105.0128 m²/m³, and with the linear velocity of used-cooking oil ranging from 0.0229 m/s to 0.0827 m/s. A mass transfer coefficient mathematical model has been constructed based on the research results. The model applies to the ranges (As.dt), (DL/dt.vL), and (µL / ρL.vL.dt) from 2.2397 to 8.0020, 2.26.10-10 to 1.72.10-9, and 0.0331 to 0.3102, respectively, with an average error of 9.33%. The average tar removed was 87%.Keywords:Producer gas, mass transfer coefficient, packed-bed column, tar, used-cooking oil
Utilization of Indigofera tinctoria L. Waste for the Production of Environmentally Friendly Biobriquettes Joko Waluyo; Fachri Candra Abimanyu; Anindhea Sitta Kusuma Wardhani; Dhiah Cendikia Pradani; Fahri Chandra Prasetyo; Frizas Yardena Widharmo; Helvita Fajar Utami; Septian Warsito Utomo
Equilibrium Journal of Chemical Engineering Vol 10, No 1 (2026): Volume 10, No 1 July 2026 (First Online)
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v10i1.98010

Abstract

Indigofera tinctoria L. is a natural source of blue dye widely used in various industries, particularly in the textile sector. One of the industries utilizing Indigofera tinctoria L. as a natural dye is CV Indigo Biru Baru, based in Puron Village, Bulu District, Sukoharjo. This company specializes in the production of batik fashion. The waste generated from processing Indigofera tinctoria L. produces significant volumes of organic material, which often goes underutilized and poses a potential environmental pollution risk. This study aims to optimize this waste by converting it into biobriquettes as an alternative fuel source. The production process involves pyrolyzing the waste at temperatures of 300–350℃ for 2 hours, followed by binding with tapioca starch paste at a 10:1 ratio, molding, and quality testing based on SNI (Indonesian National Standard). The biobriquette characterization includes proximate analysis, calorific value measurement, drop test, and yield evaluation. The results showed a moisture content of 6.9665%, ash content of 7.2025%, volatile matter content of 33.522%, fixed carbon content of 52.309%, and a calorific value of 5438.902 cal/g. Meanwhile, the hardness test indicated that only 0.042% of the mass was lost during the drop test, demonstrating excellent physical durability. With its high calorific value and superior physical characteristics, this biobriquette exhibits great potential as a renewable fuel to support sustainable energy transition in Indonesia.
Optimizing Bioky Performance Using Super Small Vessel in Wastewater Treatment Installation at PT. X in Klaten Joko Waluyo; paryanto paryanto; Raihan Alamsyah; Deni Kurniawan; Ibnu Singgih Pranoto; Yulinar Pramesti Cahyani
Equilibrium Journal of Chemical Engineering Vol 8, No 1 (2024): Volume 8, No 1 July 2024
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v8i1.84831

Abstract

One of the causes of environmental pollution is liquid waste generated by industries, especially the printing industry. PT Macanan Jaya Cemerlang is one of the printing industries producing liquid waste that does not meet the quality standards. The purpose of this research is to optimize the performance of Bioky bacteria using the Super Small Vessel in the wastewater treatment plant at PT X Klaten. Treatment involves testing variables such as residence time and bacteria quantity's impact on TSS, MBAS, COD, BOD, pH, and ORP.The study employs anaerobic treatment with observed variables: residence time of 1; 2; and 3 days, and bacteria quantity of 2.4; 3.2; and 4 liters. Samples from each variable are then analyzed for pH, ORP, and TSS. COD, BOD, and MBAS are tested after obtaining the best TSS results from each variable.The research results indicate that longer residence time and increased bacteria quantity lead to greater reduction in TSS, COD, BOD, and MBAS, while pH approaches neutrality. Optimal conditions occur at a 3-day residence time with 4,0 liters of bacteria, resulting in a reduction of TSS, COD, BOD, and MBAS against the inlet by 99.75%, 95.47%, 94.84%, and 26.72%. Although the treated waste doesn't meet the established standards, it effectively reduces the pollution levels in PT X's wastewater. Keywords:Anaerobic, Efficiency, Printing Industry Liquid Waste, Super Small Vessel
Green Energy from Palm Kernel Shell Gasification – dual fuel engine performance analysis Firman Asto Putro; Sunu Herwi Pranolo; Joko Waluyo; Dwi Hantoko; Agapeano Aditama; Mochamad Wahyu Utomo
Equilibrium Journal of Chemical Engineering Vol 8, No 1 (2024): Volume 8, No 1 July 2024
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v8i1.83497

Abstract

Electricity generation in Indonesia is mainly generated from non-renewable fuels. Based on these problems, this research utilizes palm kernel shells to be converted into producer gas as secondary fuel for a 5 kW diesel engine. Through a gasification process equipped with a cooling and gas cleaning system, low tar gas is fed to the diesel engine with variations of gas flow rate ratio to combustion air. A dummy load is installed to investigate the effect of load on diesel consumption. The diesel engine vibration increases due to using two fuel types was measured by installing a vibration meter. The research results show that the higher the load and the greater the ratio of producer gas injected, the less diesel consumption. At a gas ratio of 4:1 and an increase of load from 1 to 5 kW, the diesel fuel flow rate reduces by 25 - 31%. The most significant reduction in diesel consumption occurred at a load of 5 kW, valued at 38.49%. On the other hand, increasing the gas ratio causes an increase in diesel engine vibration. The research results showed an increase in engine vibration of 5.84% - 10.25%. The largest vibration was recorded at a load of 5 kW with a value of 92.4 m/s².Keywords:Gasification, Palm Kernel Shell, Dual Fuel Engine, Diesel Consumption, Diesel Engine Vibration
Co-Authors Agapeano Aditama Ameilia Ayu Safitri Anindhea Sitta Kusuma Wardhani Ari Diana Susanti Ary Setyawan Bahaul Fahmi Al Haq Bregas Siswahjono Tatag Sambodo Deni Kurniawan Dhiah Cendikia Pradani Dwi Hantoko Dwi Hantoko Fachri Candra Abimanyu Fahri Chandra Prasetyo Fawnia Hanifah Fenny Tri Ariyani Firman Asto Putro Firman Asto Putro Firman Asto Putro Frizas Yardena Widharmo Fuad Dimar Fauzi Hafidz Dhany Wicaksono Helvita Fajar Utami Herri Susanto I.G.B Ngurah Makertihartha I.G.B.N. Makertihartha Ibnu Singgih Pranoto Ida Maya Sari Jenni Prasetiyo Jenny Rizkiana Margono Margono Maudy Pratiwi Novia Matovanni Mi Yan Mochamad Wahyu Utomo Muhammad Ibrahim Hanif Muhammad Nur Ikhsanudin Mujtahid Kaavessina Paryanto Paryanto Petric Marc Ruya Prabang Setyono Raihan Alamsyah Rizky Ibnufaatih Arvianto Septian Warsito Utomo Sperisa Distantina Sunu Herwi Pranolo Sunu Herwi Pranolo Sunu Herwi Pranolo Sunu Herwi Pranolo Sunu Herwi Pranolo Tobias Richards Wahyu Nur Hidayat Yulinar Pramesti Cahyani Yusi Prasetyaningsih