Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik

Studi Pengaruh Konsentrasi Katalis ZnO untuk Degradasi Limbah Palm Oil Mill Effluent (POME) Menggunakan Teknologi Fotokatalitik

Farizky Wahyudi, Wibawa Hendra Saputera, Dwiwahju Sasongko, Hary Devianto — Fri, 17 Nov 2023 00:00:00 +0700

Indonesia is among the world’s largest palm oil market countries leading to significant growth in the domestic palm oil industry. However, the increase in palm oil trading has also led to a rise in the production of waste known as Palm Oil Mill Effluent (POME). Currently, the majority of factories use open ponds for POME processing, but this method is considered ineffective for treating POME. To address this issue, researchers are exploring photocatalytic technology, which utilizes light energy (UV, visible, sunlight) to produce radical compounds that act as oxidizing agents for POME degradation. In this study, ZnO was employed as a catalyst. The XRD and UV-vis DRS characterizations confirmed that ZnO had a hexagonal wurtzite crystal structure with a band gap energy of 3,22 eV. The photocatalytic activity test results revealed that using 0.5 g/L ZnO catalyst proved to be efficient in degrading organic content in POME. The percentage of chemical oxygen demand (COD) degradation reached 22.85%, color degradation reached 48.53% and the reaction rate kinetics constant of COD degradation was at 2.6´10^-3 min^-1.

Hidrogenasi Hidrotermal Katalitik Asam Oleat dengan Produksi Hidrogen secara in-situ Menggunakan Katalis NiO/y-Al2O3

Federiko Markus Lasardo Nainggolan, Tirto Prakoso, Meiti Pratiwi — Fri, 17 Nov 2023 00:00:00 +0700

Hydrogenation reaction is one of the most important reactions for the oleochemical industry to convert unsaturated fatty acids into saturated fatty acids and their derivatives. The need for large amounts of hydrogen in hydrogenation reactions will be a problem in terms of hydrogen availability and economy. Catalytic hydrothermal technology offers several advantages including the ability to produce hydrogen in-situ. The focus of this research is to evaluate the effect of metal charge addition on the catalyst, the effect of tin addition on NiO/y-Al₂O₃ catalyst and the effect of glycerol addition as a source of H₂ production in-situ on the hydrogenation conversion of oleic acid. The catalyst was prepared by dry impregnation method. XRD, XRF and BET characterization of the catalysts confirmed the presence of Ni and Sn metals on the catalysts. Hydrogenation conversion in the reaction without glycerol using NiO/y-Al₂O₃ catalyst at 300^oC for 6 hours did not show significant changes with the addition of metal loading. However, the addition of Sn metal increased the selectivity of in-situ H₂ production used to hydrogenate oleic acid with a hydrogenation conversion of 36%. The addition of glycerol to the reactants also increased the hydrogenation conversion compared to the reaction without glycerol.

Analisa Pengukuran Parameter Quality of Service dan Quality of Experience pada Layanan HbbTV

Fri, 17 Nov 2023 00:00:00 +0700

Hybrid Broadcast Broadband TV (HbbTV) is delivery standard for signaling, transmission, presentation of enhanced interactive television services and related applications, designed for use over broadcast networks and Internet. It is only standard that allows direct connection between linear and online content. It works on hybrid devices that include both broadcast and Internet connections. This standard will bring new dimension to services delivered through television programs (TV and Internet) and enhance consumer user experience by enabling innovative and interactive services over broadcast and broadband networks. improve. The HbbTV specification was developed by the HbbTV Association to effectively manage the rapidly increasing amount of content for today's consumers. HbbTV is a technology that combines traditional television broadcasts with Internet services and interactive applications. This research focuses on role of QoS and QoE in HbbTV implementations and measurement of parameters using Wireshark software that affect quality of service and user experience. The research method is experiment measuring QoS and QoE parameters. The QoS measurements were average throughput 47531,8bps, packet loss 4,9968%, delay 189.38ms, jitter 17700ms. We also conducted QoE measurement survey to collect user data to be collected. Data analysis revealed that 7.7% of consumer expectations of HbbTV users need to be improved.

Analisis Fluktuasi Total Electron Content (TEC) Akibat Gempa Palu dengan Formosat-3 / COSMIC

Atika Sari, Mokhamad Nur Cahyadi — Fri, 17 Nov 2023 00:00:00 +0700

Earthquakes are vibrations that occur as a result of plate shifts. When an earthquake occurs, it will cause three kinds of waves, and one of them is an acoustic wave that moves vertically and affects electrons that move freely in the ionosphere. This study aims to analyze Total Electron Content (TEC) fluctuations due to earthquakes using FORMOSAT-3 / COSMIC data. The method used is the analysis of the time and location of the occurrence of TEC fluctuations from the results of plotting the FORMOSAT-3 / COSMIC data against the time and location of the earthquake. The data used is netCDF data, which contains information on the TEC value and occultation time which on FORMOSAT-3 / COSMIC, the data was taken using the Global Positioning System Radio Occultation (GPSRO) technique. The results of the Palu earthquake on September 28, 2018 obtained 28 occultations with an anomaly time of 10 minutes after the earthquake and the distance to the epicenter was ± 3700 km.

Pemodelan Proses dan Evaluasi Ekonomi Produksi Bio-Oil dari Limbah Tandan Kosong Kelapa Sawit

Fri, 17 Nov 2023 00:00:00 +0700

Oil palm empty fruit bunches (OPEFB) are solid waste which is the residue from processing palm oil into crude palm oil (CPO). The high number of OPEFB produced requires proper handling to minimize the negative impact on the surrounding environment. One of the solutions to deal with this is to process OPEFB into bio-oil using fast pyrolysis technology. Before applying the process in the real world, it is necessary to do an economic evaluation first to find out whether the process can be economically profitable. This study aims to carry out an economic evaluation of the bio-oil production process made from OPEFB using fast pyrolysis technology. Aspen Plus was used in this study to carry out process modeling, while the economic evaluation was based on several literatures such as previous books and journals. Based on the results of the economic evaluation, the total capital cost (TCC) required to build this facility is USD 1,152,686 with an operating expenditure (OpEx) of USD 168,107. Then, from the economic indicators in the form of payback period (PBP) and internal rate of return (IRR), this facility takes 4 years to reach PBP with an IRR of 22%.

Sistem Pemantauan Kelembaban Tanah Jarak Jauh Berbasis LoRa Menggunakan Sensor pH dan Kelembaban

Fri, 17 Nov 2023 00:00:00 +0700

This study focuses on the pivotal role of water and soil in agriculture, emphasizing their significance for photosynthesis and as a planting medium, respectively. Maintaining uncontaminated soil is crucial for optimal crop growth. Remote monitoring of soil quality is facilitated by LoRa technology, with a microcontroller system employing sensors for soil moisture and pH. YL-69 moisture sensors exhibit an average error of 0.077%, with a range from 0% to 0.016%, while pH electrode probe sensors register an average error of 0.0288%, ranging from 0.034% to 0.021%. The monitoring data is transmitted through the LoRa network connected to ESP32. Field testing under Line-of-Sight (LOS) conditions at a maximum distance of 500 meters and Non-Line-of-Sight (NLOS) conditions up to 50 meters reveals that the gateway successfully detects RSSI values (-104 dBm to -64 dBm) and SNR values (-2dB to +10dB) within acceptable ranges. The average delay during data transmission between the node and the gateway is measured at 2.118 seconds. This research demonstrates the effectiveness of LoRa technology in remotely monitoring and transmitting crucial soil parameters, providing valuable insights for precision agriculture.

Perbandingan Efektifitas Protective Coating, Silica Fume dan Semen Tipe II Terhadap Pengaruh Klorida dan Sulfat pada Beton

Yudi Herdiansah, Anto Destianto, Dr. Ir. Agus Sulaeman, M.T. — Fri, 17 Nov 2023 00:00:00 +0700

Concrete that is in a surrounding with high sulfate and chloride levels can affect durability of concrete. Numerous technologies that might be often used include: protecting coating, addition of silica fume to concrete mix, and type II cement. Consequently, the intention of this have a look at was to examine effectiveness of shielding coatings, the addition of silica fume to the concrete blend, and the usage of kind II cement to grow the sturdiness of concrete uncovered to chlorides and sulfates. The specimens were made in 4 variations; cement type I specimens without protection, cement type I specimens with coating, cement type I specimens with silica fume, and cement type II without protection. The specimens were immersed in a solution of chloride and sulfate for 14 days, 28 days, 42 days, and 56 days. The study was carried out by testing the compressive strength, chloride content, chloride infiltration, visual analysis, and change of length. The results showed that protective coating had resistance to chloride and sulfate, the addition of silica fume to cement type I provided resistance to chloride but did not to sulfate, while the use of cement type II provided resistance to sulfate but did not provide chloride.

Penjadwalan Dinamis Menggunakan Metode Rolling Time Window (RTW) pada Kasus Flowshop 3 Mesin untuk Meminimumkan Total Biaya Lateness, Earliness dan Re-Scheduling

Rinto Yusriski, Budi Astuti, Andri Rachmat Kumalasian Nasution — Fri, 17 Nov 2023 00:00:00 +0700

This study discusses the problem of job scheduling in a three-machine flowshop to minimize the total cost of lateness, earliness, and rescheduling. This research takes a real system from one of the manufacturing companies engaged in the machining operations of various components. There are 12 jobs with different arrival patterns and due dates. The company uses the first-in, first-out (FIFO) scheduling method and gets the result that some products finish early and some finish late. This study tries to improve the company's scheduling performance by proposing a rescheduling using the rolling time window (RTW) method. Although it is relatively small, scheduling results show an improvement in company performance as measured by the total cost of earliness, lateness, and rescheduling, although it is relatively small (3%). This improvement is obtained by suggesting the company reschedule every 15 days by evaluating the length of the window per 30 days. The company can still use the FIFO method used by the company considering the characteristics of the jobs that come to it are still under control. The company is deemed capable of making agreements with consumers regarding the delivery deadline, making the job queues on the production floor less crowded.

Pemanfaatan Limbah Polyethylene pada Campuran Lapis Tipis Aspal Beton

Agus Juhara, Hanafi Hanafi, Rifqi Adhyaksa P, Novan Selamet Nugraha R — Fri, 17 Nov 2023 00:00:00 +0700

Flexible pavement is a road pavement that uses asphalt as a binder. Asphalt mixture performance needs to be improved by modifying using admixture material to improve its durability and resistance to plastic deformation. To increase the performance of asphalt mixtures, one of the alternatives is to utilize Polyethylene (PE) plastic waste. Hot Rolled Sheet (HRS) has a relatively high asphalt content compared to other types of mixtures because of is waterproof. This study was carried out using the dry method, Polyethylene (PE) plastic waste was added to the aggregate and hot asphalt mixture at the temperature of the mixture. Variations in the content of Polyethylene (PE) plastic waste added are 3%, 3.5%, and 4% by weight of asphalt. The characteristics of the asphalt mixture were the test results showed an increase in stability of 10 - 20% and the melting value was at 3 - 4mm. The residual strength index value shows that the addition of Polyethylene (PE) plastic waste can increase the resistance to damage by a percentage of 0.55% compared to without the addition of Polyethylene (PE) plastic waste. The level of addition of Polyethylene (PE) plastic waste is in the range of 3.5-3.9%.