Eksergi最新文献

{"title":"Utilization of Welding Electrode Waste To Purify Biogas From Hydrogen Sulfide Impurities","authors":"Timotius Anggit Kristiawan, Andryana Dwiandara Wibowo, T. Setiyawan, Nanang Apriandi","doi":"10.32497/eksergi.v19i2.4451","DOIUrl":"https://doi.org/10.32497/eksergi.v19i2.4451","url":null,"abstract":"<p>Abstract— The biogas desulphurization process has a crucial role in the widespread use of biogas due to the toxic and corrosive nature of the element hydrogen sulfide on equipment. This study investigated the potential use of waste welding electrodes as a biogas purification medium. Variables in the form of feed biogas flow rates of 1, 2, and 3 liters/minute were studied for their effects. As a result, the most optimum performance was obtained in the test with a feed biogas flow rate of 1 liter/minute, with an average reduction percentage of hydrogen sulfide content in the biogas of 27.12%.</p><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45221538","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}

{"title":"Color Degradation of Napthol Jeans with TiO2-SiO2 Photocatalyst from Karangwuni Beach Sand, Kulon Progo","authors":"Shinta Amelia, Lukhi Mulia Shitopyta, M. W., Ida Sriyana","doi":"10.31315/e.v20i1.8990","DOIUrl":"https://doi.org/10.31315/e.v20i1.8990","url":null,"abstract":": The industries that produce the most liquid waste in Indonesia are the batik and textile industries. Napthol dyes are the most widely used dyes as dyes or batik dyes which are completely non-biodegradable and can cause cancer, digestive disorders, and weakening of the body's resistance due to disease and environmental pollution. One of the processing methods currently being developed to degrade color in liquid waste is the photocatalyst method. The photocatalyst method can use a photocatalyst semiconductor in the form of TiO 2 with a supporting material in the form of SiO 2 . SiO 2 as a supporting material can be obtained from the utilization of the local potential of Karangwuni Kulon Progo beach sand. Dye processing was carried out by varying the irradiation time and concentration of Naphtol Jeans. The degradation process was applied to a 25 ml sample solution with the addition of 5 gr/L catalyst for 24 hours, 48 hours, 72 hours, 96 hours, and 120 hours of irradiation. This study resulted in the highest reduction in naphtol concentration at the concentration variable of 100 ppm with a percentage of 44.4687% and a long irradiation time of 120 hours.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48917845","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}

{"title":"Kinetic and Thermodynamic Studies in Cellulose Acetate-Polybutylene Succinate(CA-PBS)/Single Solvent/Water System for Desalination Membrane","authors":"R. D. Nyamiati, S. Nurkhamidah, Y. Rahmawati, W. Meka","doi":"10.31315/e.v20i1.8820","DOIUrl":"https://doi.org/10.31315/e.v20i1.8820","url":null,"abstract":"The most important part of the membrane synthesis process so that it has the desired pores is the solidification process of the membrane, the process begins with a change from one liquid phase into two liquid phases (liquid-liquid demixing). At a certain period during demixing, the polymer-rich phase solidifies; thus, a dense membrane matrix is formed. Parameters that determine the mechanism of membrane formation are based on thermodynamics including phase separation of Solvent-Polymer-Non-solvent which is explained through a phase diagram (Flory-Huggins Theory). This study aims to determine the initial prediction of the formation of CA-PBS membranes with various solvents used and variations of non-solvents in the best system, which is proven by its characteristics and performance when applied to desalination membranes which include ternary diagrams using cloud point data, solubility parameters with Hansesn solubility, the solvent-non-solvent diffusivity using the Tyn Calus Equation approach and the morphological proofing of the membrane through SEM photos, and the performance of the resulting membrane through salt rejection and permeate flux. The results of the difference in solubility parameters are can be predicted that using DMF solvent on the CA-PBS membrane can reduce the pore size and eliminate voids and macrovoids in the membrane morphology.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69281860","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}

{"title":"The Effect of Concentration and Type of Immersion Media (Water, Alcohol, Salt, and Vinegar Acid) on Decreasing Oxalate Levels in Porang","authors":"B. Sugiarto, Adhi Setyawan, Octavia Nurmalitasari, RR Endang Sulistyowati","doi":"10.31315/e.v20i1.8733","DOIUrl":"https://doi.org/10.31315/e.v20i1.8733","url":null,"abstract":"Porang tubers (Amorphophallus oncophyllus) contain very high levels of glucomannan and have many benefits in various fields of health, pharmaceuticals, industry, and food. Apart from having great benefits, porang tubers contain calcium oxalate which can cause itching if consumed directly, irritation, and kidney stones. This study aimed to determine the decrease in oxalate levels in porang tubers using various concentrations and types of immersion media in porang. The types of immersion media are water, salt, alcohol, and vinegar. Water immersion was carried out at 30°C, 40°C, 50°C, 60°C, and 70°C. Immersion with salt was carried out at concentrations of 6%, 8%, 10%, 12%, and 14%. Immersion with alcohol was carried out at concentrations of 20%, 30%, 40%, 50%, and 60%. The vinegar immersion was carried out at concentrations of 10%, 15%, 20%, 25%, and 30%. Oxalate levels were analyzed by the permanganate titration method. The results of immersion porang with dice and long slices in this study showed that water with a temperature of 50°C in the 5th immersion, alcohol with a concentration of 60% in the 5th immersion, salt solution with a concentration of 14% in the 5th immersion, and acetic acid with a concentration of 30% in the 5th immersion is the optimal result.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44835259","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}

{"title":"Conversion of Glycerol to Ethanol by Integrating Ultrasonic and Ni/ZSM-5 Catalyst","authors":"Devi Indrasari Mustopa Putri, S. Sumari, Handoko Darmokoesomo, G. Supriyanto, N. Nugroho","doi":"10.31315/e.v20i1.8167","DOIUrl":"https://doi.org/10.31315/e.v20i1.8167","url":null,"abstract":": The increased production of biodiesel which is used as an alternative fuel has led to an increase in the by-product in the form of glycerol. This glycerol byproduct can be utilized by converting it into other compounds such as ethanol. The production of ethanol from glycerol requires a catalyst that can break down the molecular size of glycerol, one of which is zeolite. One type of zeolite that is good to use is ZSM-5, because this type of zeolite has a high degree of thermal stability, acid stability and selectivity. The catalytic properties of ZSM-5 can be improved by impregnating metals from the transition group, in this study using Ni (nickel). The results obtained that the catalyst Ni/ZSM-5 has a total acidity value of 0.920 mmol/g and has a specific surface area of 138.754 m 2 /g. The highest ethanol product was produced at 4 hours of sonication, which was 20.362%.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45397680","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}

{"title":"Simulation of A Solar Drier for Iroko Wood (Chlorophora Excelsa) in A Tropical Environment","authors":"Fesa Putra Kristianto, Mercusuar Kemall Gibran Salim","doi":"10.31315/e.v20i1.8166","DOIUrl":"https://doi.org/10.31315/e.v20i1.8166","url":null,"abstract":": In a previous study conducted by Simo Tagne to designing a solar dryer based on mathematical equations for iroko wood in Cameroon, Africa. However, there is no complete simulation of the drying process on the tool, resulting in the lack of detailed elaboration of the iroko wood drying process. The purpose of this study is to simulate in detail the drying process on the tool using an ANSYS simulation. The model used in this simulation still uses the same mathematical model that has been studied before. This research begins by setting up the ANSYS application with the previous mathematical model, environmental conditions, and tool specifications. Furthermore, simulations are carried out using the ANSYS application with measurements of pressure, temperature, velocity and mass transfer. From this simulation obtained results for the distribution of pressure, temperature, velocity, and mass transfer. From all these distributions, it is sufficient to describe the drying process of the tool according to the mathematical model that has been studied previously.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43148438","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}

{"title":"Supporting Second Generation Biofuel Development: Thermophilic Anaerobic Digestion of Vinasse for Harmonizing with Molasses Based Bioethanol Plant Capacity","authors":"Nina Anggita Wardani, W. Budhijanto","doi":"10.31315/e.v20i1.9076","DOIUrl":"https://doi.org/10.31315/e.v20i1.9076","url":null,"abstract":"First-generation biofuel is environmental quandary due to its impact to the forest conversion into plantation area. Not only environmental sector, first-generation biofuel has other issues on socioeconomic sector. It consumes crops as its feedstock which will be a conflict between food and energy source. This conflict will impact the vulnerable people as the raising food price. Molasses-based bioethanol is second-generation biofuel which more beneficial from environmental, economic, and social aspect. Molasses-based bioethanol production process generates waste named vinasse. Vinasse can’t be directly discharged to the environment due to its high organic matter concentration which is harmful to the waterbody, soil, and air. On the other hand, high organic matter contained in vinasse can be converted into biogas and is higher potential for molasses-based bioethanol plant. This study was preliminary study for processing vinasse using thermophilic anaerobic digestion specifically by temperature direct escalation and starvation method to the mesophilic originated inoculum. The result shows robust performance of thermophilic microbia which is an averment of compatible method for enriching thermophilic anaerobic microbia in mesophilic originated inoculum.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47419612","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}

{"title":"Solar Cell Outdoor Bench Design In Open Public Space For Gadged Charging Station","authors":"Abdul Hamid, Muhammad Yusuf, Rianti Setyarini, Eritrian Bisma Primayanda, Naila Sa'adatil Muna","doi":"10.32497/eksergi.v19i01.4134","DOIUrl":"https://doi.org/10.32497/eksergi.v19i01.4134","url":null,"abstract":"<p><em>Abstract</em>—The increase in electrical energy is increasing along with the needs of rapidly developing technology. However electricity technology also produces negative impacts such as air and noise pollution caused by power plants. Electrical energy generation is still mostly generated from fossil fuels. A solution that can overcome this problem is to switch to more environmentally friendly electricity technology, such as solar panels. This solar powet plant can be used as an option as a charging energy source in a smart furniture. This research aims to make Solar Cell Powered Outdoor Charging Bench technology.  This bench has several important components, namely: Solar Panel, Solar Charging Controller (SSC), inverter, and battery. This Outdoor Bench is placed in an open place such as a park, Public Open Space and so on which will be used as a charging place for cellphones or laptops. The way this bench works starts with the absorption of solar heat by solar panels on the roof of the bench which is converted into low-voltage electrical energy, then this energy is stored in a dry battery (battery) through SSC, low-voltage electricity is converted through an inverter, and this inverter channels electricity to the socket, so that the charging bench can be used properly.</p><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42502127","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}

{"title":"Analysis of the Utilization of Organic Waste into Biogas Alternative","authors":"Firdaus Nur Rahmat, S. Sudarti, Y. Yushardi","doi":"10.32497/eksergi.v19i01.4043","DOIUrl":"https://doi.org/10.32497/eksergi.v19i01.4043","url":null,"abstract":"<p>Abstract— Waste is the main problem experienced by somepeople in Indonesia. The population is getting higher in the spanof a year. Unable with the presence of waste consisting of varioustypes of waste, this problem can be felt, namely negative impactson the surrounding environment, for example the slumenvironment, becoming a source of disease nests, and being atrigger for global warming caused by waste. This study has theaim of analyzing the use of the type of organic waste used foralternative energy, namely Biogas. In this study, we used aliterature review approach. An approach similar to the one usedhere is used to collect various data from previously conductedresearch on topics related to those being discussed here. Animalwaste, fruit and vegetable waste, and other forms of organicwaste can be converted into biogas faster than inorganic waste.For the production of biogas, mixing vegetables together isbetter than cutting them. Biogas that has been processed can beused as alternative energy that can benefit various sectors. Theuse of organic waste into biogas can reduce the problem of wastein Indonesia. </p><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46126522","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}

{"title":"Evaluation Of Refrigerating Load And Air Flow Performance In Air Conditioning Unit at Hospital Z","authors":"Nur Fatowil Aulia, Dwiana Hendrawati, M. Hanif, Baktiyar Mei H, Ahmad Hamim S, F. Sumarno, M. Surindra","doi":"10.32497/eksergi.v19i01.4253","DOIUrl":"https://doi.org/10.32497/eksergi.v19i01.4253","url":null,"abstract":"<p><em>This research was conducted to evaluate air conditioning systems in pharmaceutical warehouses against the ANSI/ASHRAE/ASHE ventilation standards 170 – 2008 and SNI-03-6572-2001. The method used is to calculate the cooling load on the FCU (Fan Coil Unit) using the CLTD (Cooling Load Temperature Difference) method and calculate the External Static Pressure on the ducting system. The analysis is carried out by comparing the results of calculating the FCU requirements with the actual specifications that have been implemented. Furthermore, the measurement results of the existing room air condition are compared with the standards for pharmaceutical warehouse applications. The calculation results show that the pharmaceutical warehouse has a cooling load of 47,472.72 Btu/hr, and has an external static pressure of 123 Pa. While the selected FCU (Fan Coil Unit) has a capacity of 78,771 Btu/hr and a maximum external static pressure of 130 Pa with a rated airflow of 4000 m3/hr. After 9 years of use, it is known that the rated airflow has decreased by around 37% of the FCU capacity. Existing room air conditions obtained the extreme temperature and RH of 23.36°C and 72%, respectively.</em></p><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script><script id=\"stacks-wallet-provider\" type=\"text/javascript\" src=\"chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js\"></script>","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42005580","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}