Satria Bayu Nugraha, Mohammad Jufriyanto, Ahmad Wasiur Rizqi
Kopi Bubuk Eyang Kakung is one of the micros, small and medium enterprises (MSMEs) in Gresik which operates in the field of coffee bean processing. This company often faces a situation where raw material supplies are close to running out, which is often referred to as stockout. To solve these challenges related to inventory management, Kopi Bubuk Eyang Kakung tries to use the economic order quantity (EOQ) methodology. EOQ is an important technique in procuring raw materials in a company, which aims to determine the most economical order quantity for each purchasing cycle, while determining the order frequency and optimal time for reordering. The use of the EOQ method is helpful in reducing costs associated with inventory, thereby ensuring effective operation of the inventory system. This method facilitates achieving optimal order quantities while minimizing costs. Specifically, the EOQ method determines the most efficient order quantity by considering the costs per period related to raw materials for BM coffee beans of IDR 140,724, JM of IDR 213,065, and BA of IDR 88,228.
{"title":"Optimalisasi Pengendalian Persediaan Biji Kopi Dengan Metode EOQ (Studi Kasus Kopi Bubuk Eyang Kakung)","authors":"Satria Bayu Nugraha, Mohammad Jufriyanto, Ahmad Wasiur Rizqi","doi":"10.32672/jse.v8i4.6850","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6850","url":null,"abstract":"Kopi Bubuk Eyang Kakung is one of the micros, small and medium enterprises (MSMEs) in Gresik which operates in the field of coffee bean processing. This company often faces a situation where raw material supplies are close to running out, which is often referred to as stockout. To solve these challenges related to inventory management, Kopi Bubuk Eyang Kakung tries to use the economic order quantity (EOQ) methodology. EOQ is an important technique in procuring raw materials in a company, which aims to determine the most economical order quantity for each purchasing cycle, while determining the order frequency and optimal time for reordering. The use of the EOQ method is helpful in reducing costs associated with inventory, thereby ensuring effective operation of the inventory system. This method facilitates achieving optimal order quantities while minimizing costs. Specifically, the EOQ method determines the most efficient order quantity by considering the costs per period related to raw materials for BM coffee beans of IDR 140,724, JM of IDR 213,065, and BA of IDR 88,228.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139317114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Evie Talia Nurrohmah, Yanuar Pandu Negoro, Mohammad Jufriyanto
PT Aneka Jasa Grhadika is a company that focuses on the Engineering, Procurement, and Construction (EPC) sector. They are highly committed to maintaining the quality of their products with the aim of providing trust and satisfaction to customers. To manufacture its products, the company adopts three main production systems, namely Make to Order (MTO), Assembly to Order (ATO), and Engineering to Order (ETO). They are very committed to maintaining the quality of their products with the aim of providing trust and satisfaction to customers. The purpose of this study is to formulate the right decision in the context of selecting the best supplier for PT Aneka Jasa Grhadika, which has previously been one of their suppliers. The method applied is the Analytical Hierarchy Process (AHP), a decision-making technique that generates priorities for alternatives when multiple criteria are considered. Therefore, in the decision-making process, decision-makers must transform complex problems into a unified hierarchy of several levels. The results showed that the quality criteria received a weight of 32.5%. The price criteria received a weight of 31.3%, the flexibility criteria received a weight of 15.3%, the delivery criteria received a weight of 10.6% and the service criteria received a weight of 10.3%. In this study, there are three supplier options that can be selected. The analysis results show that PT Timbul Persada has a weight of 39.3%, PT Nafaro Bumi Mandiri has a weight of 37.8%, while supplier PT Harang Bumi Energi has a weight of 22.9%.
PT Aneka Jasa Grhadika 是一家专注于工程设计、采购和施工（EPC）领域的公司。他们高度致力于保持产品质量，旨在为客户提供信任和满意的产品。为了生产产品，公司主要采用三种生产系统，即按订单生产（MTO）、按订单装配（ATO）和按订单工程设计（ETO）。他们非常重视保持产品质量，目的是让客户信任和满意。本研究的目的是为 PT Aneka Jasa Grhadika 公司选择最佳供应商（该公司曾是其供应商之一）制定正确的决策。所采用的方法是层次分析法（AHP），这是一种决策技术，可在考虑多个标准时生成备选方案的优先级。因此，在决策过程中，决策者必须将复杂的问题转化为由多个层次组成的统一层次结构。结果显示，质量标准的权重为 32.5%。价格标准的权重为 31.3%，灵活性标准的权重为 15.3%，交货标准的权重为 10.6%，服务标准的权重为 10.3%。在本研究中，有三个供应商备选方案可供选择。分析结果显示，PT Timbul Persada 的权重为 39.3%，PT Nafaro Bumi Mandiri 的权重为 37.8%，而供应商 PT Harang Bumi Energi 的权重为 22.9%。
{"title":"Analisis Pemilihan Supplier Dalam Pengadaan Material Kapur Menggunakan Analytical Hierarchy Process (Studi Kasus PT. Aneka Jasa Grhadika)","authors":"Evie Talia Nurrohmah, Yanuar Pandu Negoro, Mohammad Jufriyanto","doi":"10.32672/jse.v8i4.6828","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6828","url":null,"abstract":"PT Aneka Jasa Grhadika is a company that focuses on the Engineering, Procurement, and Construction (EPC) sector. They are highly committed to maintaining the quality of their products with the aim of providing trust and satisfaction to customers. To manufacture its products, the company adopts three main production systems, namely Make to Order (MTO), Assembly to Order (ATO), and Engineering to Order (ETO). They are very committed to maintaining the quality of their products with the aim of providing trust and satisfaction to customers. The purpose of this study is to formulate the right decision in the context of selecting the best supplier for PT Aneka Jasa Grhadika, which has previously been one of their suppliers. The method applied is the Analytical Hierarchy Process (AHP), a decision-making technique that generates priorities for alternatives when multiple criteria are considered. Therefore, in the decision-making process, decision-makers must transform complex problems into a unified hierarchy of several levels. The results showed that the quality criteria received a weight of 32.5%. The price criteria received a weight of 31.3%, the flexibility criteria received a weight of 15.3%, the delivery criteria received a weight of 10.6% and the service criteria received a weight of 10.3%. In this study, there are three supplier options that can be selected. The analysis results show that PT Timbul Persada has a weight of 39.3%, PT Nafaro Bumi Mandiri has a weight of 37.8%, while supplier PT Harang Bumi Energi has a weight of 22.9%.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139318107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jihan Syahira Syifa Friema, Robert Junaidi, Mustain Zamhari
Carbon dioxide (CO2) emissions are a type of greenhouse gas emission which is the main factor in the emergence of the global warming phenomenon. Based on the total CO2 emissions released, there are 3 components that most influence high CO2 emissions, namely the electricity sector (42%), transportation (23%) and housing (6%). The trend of increasing CO2 will continue if no preventive measures are taken globally. One of these preventive efforts is to convert carbon dioxide (CO2) into methane (CH4), or known as the methanation process of carbon dioxide. In the field of fuel, the conversion of carbon dioxide into methane gas has more advantages in terms of thermodynamics. One of the factors that determine the methanation process is the activity of the catalyst. The catalyst used in this study was the Ni/Al2O3 catalyst. Ni/Al2O3 catalyst is a catalyst that has good performance in the methane formation process. However, the Ni/Al2O3 catalyst has disadvantages, one of which is that it is susceptible to carbon deposition and sintering on the catalyst. One way to improve catalyst stability performance is by adding a promoter. This research was carried out by varying the temperature, the amount of Ni/Al2O3 catalyst and adding a promoter to give structural changes to the catalyst. The results showed that the temperature and the amount of catalyst affect the amount of CH4 formed, and the addition of manganese (Mn) initiator can affect the pore structure of the catalyst.
{"title":"Pembentukan Gas Metan dari Karbon Dioksida Menggunakan Katalis Ni/Al2O3 dengan Penambahan Mn Sebagai Promotor","authors":"Jihan Syahira Syifa Friema, Robert Junaidi, Mustain Zamhari","doi":"10.32672/jse.v8i4.6776","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6776","url":null,"abstract":"Carbon dioxide (CO2) emissions are a type of greenhouse gas emission which is the main factor in the emergence of the global warming phenomenon. Based on the total CO2 emissions released, there are 3 components that most influence high CO2 emissions, namely the electricity sector (42%), transportation (23%) and housing (6%). The trend of increasing CO2 will continue if no preventive measures are taken globally. One of these preventive efforts is to convert carbon dioxide (CO2) into methane (CH4), or known as the methanation process of carbon dioxide. In the field of fuel, the conversion of carbon dioxide into methane gas has more advantages in terms of thermodynamics. One of the factors that determine the methanation process is the activity of the catalyst. The catalyst used in this study was the Ni/Al2O3 catalyst. Ni/Al2O3 catalyst is a catalyst that has good performance in the methane formation process. However, the Ni/Al2O3 catalyst has disadvantages, one of which is that it is susceptible to carbon deposition and sintering on the catalyst. One way to improve catalyst stability performance is by adding a promoter. This research was carried out by varying the temperature, the amount of Ni/Al2O3 catalyst and adding a promoter to give structural changes to the catalyst. The results showed that the temperature and the amount of catalyst affect the amount of CH4 formed, and the addition of manganese (Mn) initiator can affect the pore structure of the catalyst.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139318229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The home industry laundry has grown rapidly. However, the growth of this industry has also led to an increase in the volume of laundry wastewater that is discharged into water bodies. This can affect the condition of water bodies, especially since the waste contains phosphates as detergent builders. Therefore, an effective wastewater treatment technology is needed. This research aims to analyze the efficiency of the modified electrocoagulation-adsorption reactor in reducing the concentration of phosphate and TSS in laundry wastewater. Laundry wastewater was flowed at a rate of 0.2 L/minute in the electrocoagulation process with a current strength of 5 A for 60 minutes, followed by column adsorption for 90 minutes conducted in one experimental reactor. Aluminum electrodes and zeolite adsorbent media were used in this experiment. The variables measured were the sampling time intervals between 150-300 minutes with a 30-minute interval. The research results show that the modification of the electrocoagulation-adsorption reactor is capable of reducing the concentration of phosphate and TSS in laundry wastewater. The best efficiency for phosphate reduction occurred at 210 minutes with an efficiency of 97.67%. Meanwhile, the optimal TSS reduction occurred at 300 minutes with an efficiency of 84.26%.
{"title":"Modifikasi Kombinasi Elektrokoagulasi – Adsorpsi untuk Menyisihkan Fosfat dan TSS pada Limbah Laundry","authors":"Cello Raka Pramastya","doi":"10.32672/jse.v8i4.6728","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6728","url":null,"abstract":"The home industry laundry has grown rapidly. However, the growth of this industry has also led to an increase in the volume of laundry wastewater that is discharged into water bodies. This can affect the condition of water bodies, especially since the waste contains phosphates as detergent builders. Therefore, an effective wastewater treatment technology is needed. This research aims to analyze the efficiency of the modified electrocoagulation-adsorption reactor in reducing the concentration of phosphate and TSS in laundry wastewater. Laundry wastewater was flowed at a rate of 0.2 L/minute in the electrocoagulation process with a current strength of 5 A for 60 minutes, followed by column adsorption for 90 minutes conducted in one experimental reactor. Aluminum electrodes and zeolite adsorbent media were used in this experiment. The variables measured were the sampling time intervals between 150-300 minutes with a 30-minute interval. The research results show that the modification of the electrocoagulation-adsorption reactor is capable of reducing the concentration of phosphate and TSS in laundry wastewater. The best efficiency for phosphate reduction occurred at 210 minutes with an efficiency of 97.67%. Meanwhile, the optimal TSS reduction occurred at 300 minutes with an efficiency of 84.26%.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139318256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PT XYZ is a manufacturing company operating in the automotive sector. One of this company's flagship products is train brake pads. In production activities there are several machines, including forming machines. Based on secondary data, it is known that this forming machine has the largest contribution to product defects. This research was conducted using the OEE, FMECA, and RCM methodology. The OEE methodology is used to identify the level of effectiveness of forming machines, the FMECA methodology is used to identify critical machines, and the RCM methodology is used to determine machine repair and maintenance intervals and determine the selection of tasks in maintenance activities. The research results show that the OEE value of the forming machine is 83.79%, which is below standard. Based on the FMECA analysis, it is known that there are 2 components that are classified as critical components, namely sheet loading and molding. So, an analysis of maintenance scheduling was carried out on these two components, it was found that the sheet loading component required maintenance every 352,016 minutes and component replacement every 11.58 days with task selection in the form of a directed time. On molding components, maintenance is carried out every 328.60 minutes and component replacement every 11.46 days with the task selection being failure discovery.
{"title":"Perbaikan Sistem Perawatan Mesin Forming dengan Metode FMECA dan RCM Berdasarkan Analisis OEE Pada PT XYZ","authors":"Andrian Akbar Waluyo, Dzakiyah Widyaningrum","doi":"10.32672/jse.v8i4.6862","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6862","url":null,"abstract":"PT XYZ is a manufacturing company operating in the automotive sector. One of this company's flagship products is train brake pads. In production activities there are several machines, including forming machines. Based on secondary data, it is known that this forming machine has the largest contribution to product defects. This research was conducted using the OEE, FMECA, and RCM methodology. The OEE methodology is used to identify the level of effectiveness of forming machines, the FMECA methodology is used to identify critical machines, and the RCM methodology is used to determine machine repair and maintenance intervals and determine the selection of tasks in maintenance activities. The research results show that the OEE value of the forming machine is 83.79%, which is below standard. Based on the FMECA analysis, it is known that there are 2 components that are classified as critical components, namely sheet loading and molding. So, an analysis of maintenance scheduling was carried out on these two components, it was found that the sheet loading component required maintenance every 352,016 minutes and component replacement every 11.58 days with task selection in the form of a directed time. On molding components, maintenance is carried out every 328.60 minutes and component replacement every 11.46 days with the task selection being failure discovery.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139317881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Biogas is an alternative energy source to reduce the use of fossil fuels. This research aims to explore the potential production of biogas using pretreatment of coffee husk substrate, both biologically with civet dung and chemically with NaOH solution, and compare it with the process without pretreatment. The fermentation process is carried out by adding rumen microorganisms to each digester with variations in substrate composition and fermentation time for 35 days, with sampling times at 7, 14, 21, 28, and 35 days. Biogas testing is performed by measuring the methane (CH4) content and total solids (TS) in the substrate. The results of the research show that pretreatment of coffee husk substrate has a significant impact on biogas (CH4) production. Biological pretreatment with civet dung produced the highest methane gas, reaching 42.3724% on the 28th day of fermentation with a mixture of 50% coffee husk + 25% rumen + 25% water, while the process without pretreatment produced the lowest methane gas, at 6.38433% on the 7th day of fermentation. The total solids results indicate an increase and decrease in total solids content in the reactor with various treatments. The highest total solids result was obtained with biological pretreatment at 40.15%. This research indicates that biological pretreatment of coffee husk substrate with civet dung can increase biogas production efficiency, which can be a potential solution to reduce dependence on fossil energy sources and sustainably manage coffee husk waste.Keywords: Biogas, Pretreatment, Coffee Peel, Civet Dung, Rumen Microorganisms, Production Efficiency, NaOH Solution.
{"title":"Potensi Biogas Dengan Pretreatment Substrat Kulit Kopi Menggunakan Campuran Rumen Sapi","authors":"A. Salwa","doi":"10.32672/jse.v8i4.6730","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6730","url":null,"abstract":"Biogas is an alternative energy source to reduce the use of fossil fuels. This research aims to explore the potential production of biogas using pretreatment of coffee husk substrate, both biologically with civet dung and chemically with NaOH solution, and compare it with the process without pretreatment. The fermentation process is carried out by adding rumen microorganisms to each digester with variations in substrate composition and fermentation time for 35 days, with sampling times at 7, 14, 21, 28, and 35 days. Biogas testing is performed by measuring the methane (CH4) content and total solids (TS) in the substrate. The results of the research show that pretreatment of coffee husk substrate has a significant impact on biogas (CH4) production. Biological pretreatment with civet dung produced the highest methane gas, reaching 42.3724% on the 28th day of fermentation with a mixture of 50% coffee husk + 25% rumen + 25% water, while the process without pretreatment produced the lowest methane gas, at 6.38433% on the 7th day of fermentation. The total solids results indicate an increase and decrease in total solids content in the reactor with various treatments. The highest total solids result was obtained with biological pretreatment at 40.15%. This research indicates that biological pretreatment of coffee husk substrate with civet dung can increase biogas production efficiency, which can be a potential solution to reduce dependence on fossil energy sources and sustainably manage coffee husk waste.Keywords: Biogas, Pretreatment, Coffee Peel, Civet Dung, Rumen Microorganisms, Production Efficiency, NaOH Solution.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139318224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Abdurrahman, Akhmad wasiur Rizqi, Mohammad Jufriyanto
Konsep kualitas sering dikaitkan dengan kemampuan suatu produk untuk memenuhi kebutuhan dan harapan pelanggan. Penelitian ini melakukan pemeriksaan terhadap langkah-langkah pengendalian kualitas yang digunakan dalam proses pengeringan kayu. Analisis yang dilakukan menggunakan pendekatan tujuh alat yang meliputi check sheet, stratifikasi, diagram kendali, histogram, diagram Pareto, plot sebar, dan diagram tulang ikan. Temuan dari pengumpulan data menunjukkan adanya tiga kategori cacat produk berbeda yang terlihat selama proses pengeringan kayu. Kategori-kategori ini mencakup 1.529 kejadian lengkungan, 1.337 kejadian patah tulang, dan 955 kejadian cek. Berdasarkan penggunaan teknik tujuh alat, ditentukan bahwa kategori cacat produk yang paling dominan adalah kesalahan warp, yang mencakup 40% dari total cacat produk. Komponen penyumbang utama disebabkan oleh faktor teknik yang memiliki nilai indeks keunggulan relatif (RPN) sebesar 168, Solusi yang perlu dilakukan yaitu menyesusaikan kurva pengeringan dengan benar sesuai dengan jenis kayu yang dikeringkan, kurva ini harus mempertimbangkan kelembaban awal kayu, ketebalan, dan jenis kayu yang digunakan, dilakukan pembuatan SOP pengeringan kayu untuk tiap jenis kayu, melakukan sosialisasi atapun pelatihan kepada operator, melakukan pengecekan mesin sebelum digunakan
{"title":"Pengendalian Kualitas Kayu Kering Pada Mesin Kiln Dryer Untuk Mengurangi Produk Cacat Dengan Metode Seven Tools Dan Failure Mode Effect Analysis","authors":"M. Abdurrahman, Akhmad wasiur Rizqi, Mohammad Jufriyanto","doi":"10.32672/jse.v8i4.6769","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6769","url":null,"abstract":"Konsep kualitas sering dikaitkan dengan kemampuan suatu produk untuk memenuhi kebutuhan dan harapan pelanggan. Penelitian ini melakukan pemeriksaan terhadap langkah-langkah pengendalian kualitas yang digunakan dalam proses pengeringan kayu. Analisis yang dilakukan menggunakan pendekatan tujuh alat yang meliputi check sheet, stratifikasi, diagram kendali, histogram, diagram Pareto, plot sebar, dan diagram tulang ikan. Temuan dari pengumpulan data menunjukkan adanya tiga kategori cacat produk berbeda yang terlihat selama proses pengeringan kayu. Kategori-kategori ini mencakup 1.529 kejadian lengkungan, 1.337 kejadian patah tulang, dan 955 kejadian cek. Berdasarkan penggunaan teknik tujuh alat, ditentukan bahwa kategori cacat produk yang paling dominan adalah kesalahan warp, yang mencakup 40% dari total cacat produk. Komponen penyumbang utama disebabkan oleh faktor teknik yang memiliki nilai indeks keunggulan relatif (RPN) sebesar 168, Solusi yang perlu dilakukan yaitu menyesusaikan kurva pengeringan dengan benar sesuai dengan jenis kayu yang dikeringkan, kurva ini harus mempertimbangkan kelembaban awal kayu, ketebalan, dan jenis kayu yang digunakan, dilakukan pembuatan SOP pengeringan kayu untuk tiap jenis kayu, melakukan sosialisasi atapun pelatihan kepada operator, melakukan pengecekan mesin sebelum digunakan","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139317912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tiara Manda Putri, Robert Junaidi, Anerasari Meidinariasty
Carbon dioxide (CO2) is one of the most critical greenhouse effect causes. One method that can reduce the problem of global warming is by converting CO2 and utilizing it into a CO2 hydrogenation reaction into methane. This research aims to obtain methane gas from CO2 gas using a Fixed Bed Reactor for the CO2 methanation process. This research uses Ni/Al2O3 catalyst as support and Fe metal as a promoter with in situ method by varying the amount of Fe metal promoter up to 1gr - 5gr and time variation of 30 minutes, 45 minutes and 60 minutes. The highest methane gas yield was obtained in sample 15 with more Fe metal promoter 5 gr (variation 1-5 gr) for 60 minutes (variation 30, 45, and 60 minutes), which amounted to 12.54%. The amount of Fe metal promoter and the length of time used is directly proportional to the methane gas (CH4) produced. This is because the addition of Fe as a promoter can increase catalyst activity and catalyst stability, so that the catalyst can work well in converting CO2 into methane thermal gas.Keywords: Carbon Dioxide, CO2 Methanation, Catalyst Ni/Al2O3, Promoter Fe, Methane (CH4).
二氧化碳（CO2）是造成温室效应的最重要原因之一。一种可以减少全球变暖问题的方法是将二氧化碳转化为甲烷，并利用二氧化碳加氢反应将其转化为甲烷。本研究旨在利用固定床反应器进行二氧化碳甲烷化过程，从二氧化碳气体中获取甲烷气体。本研究以 Ni/Al2O3 催化剂为载体，以金属铁为促进剂，采用原位法，改变金属铁促进剂的用量至 1 克至 5 克，时间变化为 30 分钟、45 分钟和 60 分钟。在样品 15 中，金属铁促进剂的用量为 5 克（变化量为 1-5 克），时间为 60 分钟（变化量为 30 分钟、45 分钟和 60 分钟），甲烷产气量最高，达到 12.54%。金属铁促进剂的用量和使用时间的长短与产生的甲烷气体（CH4）成正比。这是因为添加 Fe 作为促进剂可以提高催化剂的活性和催化剂的稳定性，从而使催化剂在将 CO2 转化为甲烷热气时能很好地发挥作用：二氧化碳 CO2 甲烷化 催化剂 Ni/Al2O3 促进剂 Fe 甲烷 (CH4)
{"title":"Pembuatan Gas Metana Dari Gas Karbon Dioksida (CO2) Menggunakan Katalis Ni/Al2O3 Dengan Promotor Logam Fe","authors":"Tiara Manda Putri, Robert Junaidi, Anerasari Meidinariasty","doi":"10.32672/jse.v8i4.6782","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6782","url":null,"abstract":"Carbon dioxide (CO2) is one of the most critical greenhouse effect causes. One method that can reduce the problem of global warming is by converting CO2 and utilizing it into a CO2 hydrogenation reaction into methane. This research aims to obtain methane gas from CO2 gas using a Fixed Bed Reactor for the CO2 methanation process. This research uses Ni/Al2O3 catalyst as support and Fe metal as a promoter with in situ method by varying the amount of Fe metal promoter up to 1gr - 5gr and time variation of 30 minutes, 45 minutes and 60 minutes. The highest methane gas yield was obtained in sample 15 with more Fe metal promoter 5 gr (variation 1-5 gr) for 60 minutes (variation 30, 45, and 60 minutes), which amounted to 12.54%. The amount of Fe metal promoter and the length of time used is directly proportional to the methane gas (CH4) produced. This is because the addition of Fe as a promoter can increase catalyst activity and catalyst stability, so that the catalyst can work well in converting CO2 into methane thermal gas.Keywords: Carbon Dioxide, CO2 Methanation, Catalyst Ni/Al2O3, Promoter Fe, Methane (CH4).","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139318023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Indrianawati Indrianawati, S. Sumarno, Tedy Imanuel Selan
Efforts to improve the quality of Trans Metro Pasundan services can be carried out by determining the coverage area of Trans Metro Pasundan bus stops. One way is by analyzing the coverage area of TMP bus stops towards the locations of universities located in the Bandung Raya region. The method used for this analysis of TMP bus stop coverage towards university locations is the network analyst service area method. The coverage radius for TMP bus stop services is determined based on the maximum walking distance from and to the TMP bus stop, which is 400 meters and 800 meters. The analysis results show that out of 124 universities in the Bandung Raya region, 31 universities are within the coverage area of TMP bus stops within a 400-meter radius, and 45 universities are within the coverage area of TMP bus stops within an 800-meter radius. An analysis of the coverage capability of bus stops towards universities shows that the Bandung Accounting Academy is the university most accessible by TMP bus stops, with a total of 8 bus stops within a 400-meter radius and 13 bus stops within an 800-meter radius.
{"title":"Analisis Jangkauan Layanan Halte Trans Metro Pasundan Terhadap Lokasi Perguruan Tinggi di Wilayah Bandung Raya","authors":"Indrianawati Indrianawati, S. Sumarno, Tedy Imanuel Selan","doi":"10.32672/jse.v8i4.6803","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6803","url":null,"abstract":"Efforts to improve the quality of Trans Metro Pasundan services can be carried out by determining the coverage area of Trans Metro Pasundan bus stops. One way is by analyzing the coverage area of TMP bus stops towards the locations of universities located in the Bandung Raya region. The method used for this analysis of TMP bus stop coverage towards university locations is the network analyst service area method. The coverage radius for TMP bus stop services is determined based on the maximum walking distance from and to the TMP bus stop, which is 400 meters and 800 meters. The analysis results show that out of 124 universities in the Bandung Raya region, 31 universities are within the coverage area of TMP bus stops within a 400-meter radius, and 45 universities are within the coverage area of TMP bus stops within an 800-meter radius. An analysis of the coverage capability of bus stops towards universities shows that the Bandung Accounting Academy is the university most accessible by TMP bus stops, with a total of 8 bus stops within a 400-meter radius and 13 bus stops within an 800-meter radius.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139318077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Agistya Rizza Subagyo, Vionna Chantika Salsabilla, Irma Juliana Samantha, Muhammad Faisal Irham, Muhammad Rapika, M. Mutiara, W. K. Suryawan
The problem that often occurs in hospitals is that regulations related to hospital environmental health still need to be popular in the community. However, the development of technology and science has made agricultural tools and machines experience development and renewal and adapt to environmental conditions. Many types of fly control are available, such as fly traps in temporary garbage shelters in hospitals. This study analyzes operational needs and problems encountered by implementing fly trap technology in hospitals. This study consisted of three stages: budgeting, calculating the Kepner-Tregoe Situation Appraisal (KTSA), and the Kepner-Tregoe Potential Problem Analysis (KTPPA). The total operational costs required for this tool are IDR 887,496.00. Where this cost includes the component of preventing problems that must be faced in fly trap operations. Identification of tool constraints in operation consists of damage to the net on the fly trap, garbage piling up due to overloading in the garbage container, blockage of the entry path for flies to the fly trap, and the garbage collector coming into contact with the waste at the TPS. There are four potential problems in implementing fly traps that we previously identified, where there are possible causes, preventive actions, and contingent actions that can be taken to overcome these potential problems.
{"title":"Optimizing Hospital Waste Management through Fly Trap Technology: A Cost and Potential Problem Analysis","authors":"Agistya Rizza Subagyo, Vionna Chantika Salsabilla, Irma Juliana Samantha, Muhammad Faisal Irham, Muhammad Rapika, M. Mutiara, W. K. Suryawan","doi":"10.32672/jse.v8i4.6571","DOIUrl":"https://doi.org/10.32672/jse.v8i4.6571","url":null,"abstract":"The problem that often occurs in hospitals is that regulations related to hospital environmental health still need to be popular in the community. However, the development of technology and science has made agricultural tools and machines experience development and renewal and adapt to environmental conditions. Many types of fly control are available, such as fly traps in temporary garbage shelters in hospitals. This study analyzes operational needs and problems encountered by implementing fly trap technology in hospitals. This study consisted of three stages: budgeting, calculating the Kepner-Tregoe Situation Appraisal (KTSA), and the Kepner-Tregoe Potential Problem Analysis (KTPPA). The total operational costs required for this tool are IDR 887,496.00. Where this cost includes the component of preventing problems that must be faced in fly trap operations. Identification of tool constraints in operation consists of damage to the net on the fly trap, garbage piling up due to overloading in the garbage container, blockage of the entry path for flies to the fly trap, and the garbage collector coming into contact with the waste at the TPS. There are four potential problems in implementing fly traps that we previously identified, where there are possible causes, preventive actions, and contingent actions that can be taken to overcome these potential problems.","PeriodicalId":17758,"journal":{"name":"Jurnal Serambi Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139317775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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