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All Journal Jurnal Energi Dan Manufaktur Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Jurnal Inovator SRIWIJAYA JOURNAL OF ENVIRONMENT International Journal of Information Engineering and Science
Erna Yuliwati
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Agriculture, Biological Sciences & Forestry Automotive Engineering Chemistry Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Physics Public Health

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Optimasi Kondisi Pemesinan untuk Kekasaran Permukaan pada Proses Slot Milling Baja Tahan Karat AISI 304 Amrifan Saladin Mohruni; Erna Yuliwati; Redy Kholif Muhrobin
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Dalam slot millingbeberapa parameter berkontribusi penting untuk mencapai kekasaranpermukaan benda kerja yang sesuai dengan kebutuhan. Diantara parameter-parametertersebutadalah kecepatan potong dan laju pemakanan, yang untukpencarian parameterkondisi pemesinan yang optimum sangat diperlukan. Dalam rangka pencarian kondisipemesinan yang optimumperlu dibuat model matematis empirik yang dapat menggambarkanhubungan antara parameter-parameter tersebut. Pada penelitian ini pembuatan modelmatematik empirik dilakukan menggunakan metodologi permukaan respon (ResponseSurface Methodology) pada sebuah plat stainless steel AISI 304 dengan dimensi adalah 150mm x 100 mm x 10 mm. Dari hasil optimasi diperoleh bahwa kecepatan potong dan lajupemakanan yang menghasilkan respon Ra0,510 ?m yang optimal berturut-turut adalah 30m/min dan 0,15 mm/tooth. Sementara itu, nilai Ra yang terbesar yang diperoleh dalampengujian ini adalah 4,783 ?m.Kata kunci: optimasi,slot milling, stainless steel AISI 304, response surface methodologyIn slot milling, some parameters give important contribution to achieve required surfaceroughness of work pieces. These parameters are cutting speed and feed rate, which arerequired for finding of the optimum cutting conditions. In order to find this optimum cuttingcondition, it is necessity to generate the empirical mathematical model, which figured out therelationship among the involved parameters. In this study, the response surface methodology(RSM) was used in constructing of empirical mathematical models on stainless steels AISI304 (150 mm x 100 mm x 10 mm). The optimized surface roughness Ra0, 510 ?m wasresulted using cutting speed and feed rate 30 mm/min and 0,15 mm/tooth respectively. Incontrary, the maximum surface roughness Ra achieved is 4,783 ?m.Keywords: optimization, slot milling, stainless steel AISI 304, response surface methodology
Green Technology Contribution in Development of Coolant Wastewater Filtration Erna Yuliwati
Sriwijaya Journal of Environment Vol 3, No 2 (2018): Soil and Water
Publisher : Program Pascasarjana Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (200.411 KB) | DOI: 10.22135/sje.2018.3.2.74-79

Abstract

The aim of this study  is the contribution of green technology in the sustainable development of oily wastewater from machining process. The cross-flow membranes has been performed for treating wastewater emulsion of oil derived from the automotive industry on the metal cutting section. The  objective of this study is to treat liquid waste from machining process using membrane technology. The mechanism of ultrafiltration process is flow of small molecules pass through pore of membrane. The performance of the cellulose acetate hydrophilic membrane is determined by the permeate and rejection flux. The operation of this two-stage ultrafiltration membrane involves a 12% composite cellulose acetate membrane (CA-12) in phase I and 15% (15%) cellulose acetate membrane (CA-15) in phase II with a 90 minute operating time with pressure of 3.5 bar. Flux of phase I, without pretreatment and with pretreatment are 17,03 L / m2.h and 59,05 L / m2.h respectively. In phase II, the flux of treatment without and with preteeatment are 22.08 L / m2.h and 24.86 L / m2.h , respectively. COD and surfactant rejection for both membrane without pretreatment of 96.57% and 96.35%, whereas for waste feed with COD rejection of 98.56% and surfactant rejection of 97.44 %.
Optimization of Domestic Wastewater Treatment Using a Mixture of Coconut Shell Activated Carbon Adsorbent and Fly Ash Oktaviansyah, Ikbal; Erna Yuliwati; Eko Ariyanto
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 21 No. 2 (2024): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v21i2.16246

Abstract

Utilization of solid waste raw materials in the form of coconut shells and fly ash as adsrobents for domestic wastewater treatment. This study aims to optimize the effect of coconut shell activated carbon and fly ash with variations in mass ration and stirring time on changes in pH, COD, BOD, ammonia, TSS, and total coliform by adsorption on domestic liquid waste to meet waste quality standards. The research method includes the preparation of activated carbon from coconut shell, SEM characterization and experiments of a mixture of coconut shell activated carbon mass and fly ash (5:10, 10:5, 5:15, 15:5 grams) with variations in stirring time (30 minutes, 60 minutes). The results of the study, the most optimal mixture for changes in pH, ammonia, TSS, COD, BOD, total coliform parameters in domestic wastewater was a mixture of coconut shell activated carbon adsorbent mass of 15 grams and fly ash of 5 grams with a stirring time of 60 minutes.
Addition of Plastic Mixture (LDPE) for the Development of Alternative Mixtures in Concrete Blocks Abdullah, Abdullah; Erna Yuliwati; Eka Sri Yusmartini
International Journal of Information Engineering and Science Vol. 2 No. 3 (2025): August : International Journal of Information Engineering and Science
Publisher : Asosiasi Riset Teknik Elektro dan Infomatika Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62951/ijies.v2i3.301

Abstract

This study investigates the potential of Low-Density Polyethylene (LDPE) plastic waste as a partial substitute for sand in concrete block mixtures, focusing on its effects on compressive strength and water absorption. LDPE is a non-biodegradable plastic waste that poses significant environmental challenges. Its incorporation into construction materials offers a promising solution to reduce pollution while enhancing the performance of building components. The research employed LDPE substitution levels of 10%, 15%, 20%, 25%, and 30% by weight of sand, compared against conventional concrete blocks without LDPE. Experimental results revealed that the highest compressive strength was achieved with a 15% LDPE mixture, reaching 80.762 kg/cm² at 28 days of curing—an increase of approximately 40.8% compared to normal blocks, which recorded 57.359 kg/cm². LDPE additions up to 20% maintained favorable strength characteristics, while higher proportions (25% and 30%) led to a decline in mechanical performance. In terms of water absorption, the inclusion of LDPE demonstrated a decreasing trend, attributed to the hydrophobic nature of plastic, which enhances moisture resistance in the concrete blocks. These findings suggest that a 15% LDPE substitution represents an optimal formulation for producing eco-friendly concrete blocks with improved strength and reduced water absorption. The study highlights the dual benefits of waste management and material innovation, aligning with sustainable development goals. By repurposing plastic waste into construction applications, this approach not only mitigates environmental impact but also contributes to the advancement of green building technologies. Further research is recommended to explore long-term durability, thermal properties, and scalability of LDPE-based concrete products in real-world construction settings.
Variasi Sinar Ultraviolet pada Sistem Membran Ultrafiltrasi untuk Pengolahan Air Gambut Erna Yuliwati; Edisfha Ajeng Rahayu; Heni Yuniar; Elfidiah
Jurnal INOVATOR Vol. 6 No. 1 (2023): Jurnal INOVATOR
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/inovator.v6i1.3

Abstract

Peat water treatment still has many obstacles, one of the alternatives that can be used to overcomethis obstacle is membrane technology and UV light variais. This study aims to determine the effect of UV rayson the flux and content of BOD, TSS, pH, Turbidity, Color and E.Coli Bacteria. This study used a combinedmethod, namely ultraviolet (UV) light poses using a UV Water Sterilizer, the filtration process using the KUF3 ultrafiltration membrane and the phytoremediation method with kiambang plants. The results of this studyshowed the highest removal rate of BOD in the filtration process with UV 6 watts at 90 minutes of filtrationtime with an efficiency of 94.71%. The color removal rate in the filtration process with UV is 6 watts at 90minutes of filtration time with an efficiency of 70.92%. Turbidity removal rate in the filtration process withUV 6 watts at 90 minutes filtration time with an efficiency of 99.97%%. The TSS removal rate in the filtrationprocess with UV is 6 watts at 90 minutes of filtration time with an efficiency of 47.77%. The pH removal ratein the filtration process with UV is 6 watts at 90 minutes of filtration time with an efficiency of 24.79%. Theelimination rate of E.coli bacteria in the filtration process with UV is 6 watts at 90 minutes of filtration timewith 100% efficiency
MEMBRAN KOMPOSIT POLYVINYLIDENE FLUORIDE/ TITANIUM DIOKSIDA UNTUK PENGOLAHAN LIMBAH CAIR INDUSTRI KELAPA SAWIT Agustina; Erna Yuliwati; Mardwita
Jurnal INOVATOR Vol. 2 No. 2 (2019): Jurnal INOVATOR
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/inovator.v2i2.124

Abstract

The aim of this research is to develop membrane material and analyse the membrane performance in liquid waste management of CPO industry to separate suspended solids. Conventional waste treatment has not been able to reach the minimum regulatory standards that have been set. Land area constraints and waste management techniques are complex and produce large sludge volumes. Besides specifically for managing liquid organic waste, the difficulty of the process of degradation of waste due to the high quantity and content of contaminants that can reach up to 40,000-120,000 mg / l for COD. In this study composite membrane made by titanium dioxide in the membrane polyvinylidene fluoride was blend very well and suited to remove suspended solids in the wastewater. The optimization result obtained is the addition of TiO2 2% produce maximum flux with the value of 180 L / m2.hr and the percentage of 92% fitration. The results of the filtration process conditions were the total suspended solids (TSS) by 99.63% and ammonium nitrogen (NH3-N) by 92.82% is the ABFR process conditions at 2.25 ml / min, HRT at 276.93 min, MLSS concentration at 4.50 g / L, and the pH at 6.50. So it can be concluded that titanium dioxide resulted the minimise of average poresize and enhance the hydrophilicity of membrane that resulted the maximum flux of this process.
TUNGKU GASIFIKASI UNTUK PRODUKSI GAS METAN DARI AMPAS TEBU S. Rizal; M. Faisal; Erna Yuliwati
Jurnal INOVATOR Vol. 3 No. 1 (2020): Jurnal INOVATOR
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/inovator.v3i1.128

Abstract

Indonesia is an agrarian country with subtropical climate suitable for planting multicultural and one of those plants is sugar cane. Sugar cane is a raw material for producing sugar, where biomass waste has not been utilized appropriately. The amount of biomass waste was produced of 24-30% from sugar mills. Effective, efficient and environmentally friendly waste treatment technology is needed to utilize the waste into a renewable energy source using gasification methods. Gasification is a process to convert biomass waste to combustible gases (CO, CH4, and H2). This process is combustion with limited air supply (20% -40% stoichiometric air) to break long hydrocarbon chains into short hydrocarbons at high temperatures. This method requires an updraft gasifier furnace that is capable of being operated at high temperatures, which can convert biomass waste into syngas with high conversion. An updraft gasifier is a gasification furnace at temperature of 300-500oC and atmospheric pressure, also used air flow of 10-20 L / min and zeolite as catalyst. This research are devided into few steps, namely drying, crushing, separating, gasification process, The proximate and ultimate method was used to analyze the produced syngas. Proximate analysis is an analysis to measure the calorific value by using a calorimeter bomb, ash content used AAF furnace, and moist water content used a decator. Moreover, ultimate method was used to analyze CH4, H2, O2, N2, CO and CO2 compositions by using Gas Chromatography (GC). Firstly, sugarcane bagasse as the main raw material, were dried and chopped in 7 cm then it were put into the gasifier. The results showed that maximum syngas ratio of combustible gas (CO, H2 and CH4) and noncombustible gas (NGC) of 1.03 with added the zeolit of 200 gr and water of 40 ,L/min.
Co-Authors Abdullah Abdullah Agustina Amrifan Saladin Mohruni Edisfha Ajeng Rahayu Eka Sri Yusmartini Eko Ariyanto Elfidiah Heni Yuniar M. Faisal Mardwita Oktaviansyah, Ikbal Redy Kholif Muhrobin S. Rizal