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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Articles 3,145 Documents
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Analisa Produktivitas Crude Palm Oil (CPO) Menggunakan Metode Value Stream Mapping (VSM) (Studi Kasus: PTPN V Sei. Galuh, Kampar, Riau) Muhammad Sholihin; Anita Susilawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The Value Stream Mapping (VSM) is a mapping tool for viewing of process flow and information flow, which can help to differentiate value added and non- value added in production processes. This study aims to analyze the productivity of CPO using the VSM method (case study: CPO processing in PKS PTPN V Sei Galuh). PKS PTPN V Sei. Galuh is engaged in the palm oil processing industry that produces CPO and kernels. The research method used fish bone diagram, VSM and Process Activity Mapping (PAM) diagram to analyze CPO processing productivity. The result of this research revealed time of PAM of 1.4226 seconds/kg, while the standard time of processing company was 1.0292 seconds/kg. That was meant the value of processing productivity of 72.34%, which it needs to eliminate wastes to achieve the company target. The productivity of CPO produced an average of 66.11% for research period. Then,the current VSM was defined processing time total of value added of 1.289 seconds/kg, non-value added of 0.036 seconds/kg and activities of necessary non-value added of 0.1008 seconds/kg. Furthermore, after result of processing of the Future Value Stream Mapping (FVSM) can be eliminated the processing time total became 1.2028 seconds/kg,which value added of 1.102 seconds/kg, non-value added of 0 seconds/kg and necessary non-value added of 0.1008 seconds/kg. Based fish bone diagram analysis can be identified the wastes due to the raw material, working method, human, equipment and work environment. The largest waste contributor was improving raw material quality, because it lead to longer processing time.Keyword : Mapping, Waste Production, Fishbone Diagram
Analisa Sambaran Petir Terhadap Kinerja Arrester Pada Transformator Daya 150 kV Menggunakan Program ATP Stevanny, Cecillia; Murdiya, Fri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This study shows the effect of a lightning strike on the performance of lightning arresters at 150 kV power transformers. In the lightning strike case, there are several parameters that may affect to the arresters performance indicator, i.e the current charge and current quadratic integral . The analysis process is conducted by parameters modelling of transmission line and substation. The simulations are done by providing direct strike to the ground wire of 10 MV with a varies of the wave front time (Tf) and the duration of the strike (tau) of lightning impulse. To calculate the current charge and current quadratic integral of a wide variety of Tf and tau was involved trapezoidal numerical integration methods. Current charge and current quadratic integral that arise from direct strike and varies of Tf and tau compared to each phase in order to obtain the effect of Tf and tau lightning impulse on the performance of arresters as complied to the standard IEEE C62. 11.  Keywords: current charge, current quadratic integral, trapezoidal numerical integration methods, arresters, ATP
Studi Rugi Daya Pada Transformator 20 KV/690 VOLT Pada Industri Kertas Saat Terjadi Gangguan 1 Phasa Ke Tanah Sitanggang, Van Den Bosh; Ervianto, Edy
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Energy Losses is the Loss of Electrical energy , when it is generated and supplied through end user, thereby reducing the amount of energy that can be consumed by lumped Load is the main object of this study. Normally electrical system which is supplied from Turbine Generator, transmitted, distributed to load well, but at the time a fault arise, protective system ideally working as well as designed. In this research, assumption is taken into account when short circuit occurred ,protective system is not well- working and by doing this researcher analyze, simulate by program software ETAP 12.6.0 and calculating the losses of power that?s emerging in Transformator. By analyzing the simulation and calculation by using Kirchoff?s Current Law and the Software it is hoped all parameter contribute to the conclusion and suggestion such as the ideal set point of protective system, the chosen value of reactance and resistance of the conductor and cooling system in transformator.By getting data parameter from field that Voltage supplied 20 KV/690Volt, 3150 KVA, 2635,72 Amp of Distribution Transformer , got faulted current for 0.3 km distance fault. Iph-G = 1853,5 Amp the magnitude of power losses caused by the fault is about 13.567 Watt power.Keywords : A phase- ground fault, Power losses, Transformator capacity,
Potensi Likuifaksi Pada Tanah Timbunan Pasir Di Atas Tanah Gambut Dengan Variasi Berat Beban Melalui Uji Model Laboratorium Oki Chandra; Agus Ika Putra; Muhamad Yusa
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
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Five major earthquakes with magnitudes of more than 8 have affected Sumatra island 250 years ago (Natawidjaja, 2007). Riau province in the middle of Sumatra island is quite prone to get the impact of earthquake. The propagation of these earthquake waves causes geotechnical problems such as liquefaction. Liquefaction research has been done but the liquefaction potential in sand embankment on peat soil has never been done. The peatland in Riau Province is 3.9 million hectares out of 8.7 million hectares of Riau. So that many buildings in the Riau Province is above the peat land bankfilled with sand. This study uses a laboratory model of shaking table with speeds of 0.25 g and 0.32 g. A 0.5x1.0 meter acrylic box is installed on a shaking table and filled with 10 cm thick peat soil, then banckfilled it with 15 cm thick of sand. The peat soil and sand embankment are saturated, then the load is evenly distributed with variations of 40 kg/m2, 80 kg/m2, and 120 kg/m2. Evaluation of liquefaction potential is based on observation of the increment of pore water pressure measured by installing two vertically bankfilled pipe with a depth of 7.5 cm. On the sides of the acrylic box is also installed two rulers to observe the soil settlement. The results of this study indicate that as the given load increased, soil settlement and increase of pore water also increased. The weight of the load is also directly proportional with soil vertical pressure and pore water pressure ratio value.Keywords: liquefaction,sand, peat soil, pore water pressure, shaking table
Pengaruh Konsentrasi Gula Dan Waktu Fermentasi Terhadap Fermentasi Asam Asetat Menggunakan Kulit Nanas Dan Acetobacter Aceti Ahmad Dedi Fadillah; Chairul Chairul; Cory Dian Alfarisi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Pineapple (Ananas comosus (L) Merr) is a fruit which has a golden yellow color. Pineapple can thrive in tropical climates such as in Indonesia. Pineapple production in Indonesia in 2009 was 1,558,196 tons. The sugar contained in pineapple is 2.32% glucose, 1.42% fructose, and 7.89% sucrose. So that it can be used as an alternative material for the production of acetic acid. Acetic acid can be produced from raw materials containing starch or sugar by fermentation using microorganisms. The purpose of this study was to determine the effect of fermentation time and sugar concentration on the yield of acetic acid produced and to find out the optimal time and concentration of sugar in pineapple rind fermentation into acetic acid using Saccharomyces cerevisiae and Acetobacter aceti bacteria. The initial sugar concentration variations were 10%, 20%, and 30%, while the fermentation time was 2, 3, 4, 5, 6 days. The acetic acid fermentation process was carried out at pH 6, stirring speed 200 rpm and 10% inoculum. The test results using the Nelson-Samogyi method showed that the highest sugar concentration was 30% (174,678 g/L) of sugar added to pineapple rind raw material. The highest concentration of acetic acid was obtained 35.581 g/L and the yield of 30.555%. The best fermentation time is the 6th day of fermentation.Keywords: Acetobacter aceti, acetic acid, fermentation, inoculum, pineapple
Pengaruh Penambahan Limbah Ekstraksi Buah Kelapa Sawit Terhadap Pembuatan Beton Halim Kasuma; Alex Kurniawandy; Ermiyati Ermiyati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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The purpose of this research is to utilize the waste of palm oil with investigating the mechanical properties. The waste materials are the result of palm oil extraction. The experiment conducted to investigate the effect of this material over compressive strength, absorption, porosity, and setting time. The content of palm oil waste which added to normal concrete are varieties which are 0%, 2%, 4%, 6%, 8% and 10% of the weight of cement. The porosity test, absorption test and compressive test were performed at ages 7, 14 and 28 days for each test while curing with ordinary water. The results showed that the content of palm oil waste 2%, 4% and 6% decrease the compressive strength. Otherwise the addition of 8% and 10% increase the compressive strength. The absorption and porosity test value increase along with increase the content of palm oil using. The setting time with adding of palm oil waste is faster, rather than normal concrete. In conclusion, utilization of the waste of palm oil for concrete mixture can be done.Keyword: Concrete, Waste of Palm Oil, Extraction, Compressive strength, Porosity, Setting time
Stabilisasi Tanah Cl-Ml Menggunakan Semen Dan Difa Soil Stabilizer Endala Siboro; Muhamad Yusa; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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CL-ML (clay with low plasticity, silt with low plasticity) soil is a type of soil with inconsistent property and low bearing capacity caused by changes in water content. Soil stabilization is required to fix its problematic properties. One of the possible method to fix the soil chemically is soil stabilization with cement and DIFA soil stabilizer as additives. DIFA soil stabilizer is a type of addictive ingredient used in soil stabilization and to solidify and stabilize soil physically and chemically. This study aims to analyze the effective content of cement and DIFA soil stabilizer in increasing the compressive strength of the soil and comparing it with the compressive strength of cement-free soil. Cement content variations used were 3% and 5% from the dry weight of the soil and DIFA soil stabilizer content variations used were 0.6%, 0.8%, and 1% from dry weight of the soil. Shear strength tests were done after 0, 7, and 14 days of submersion. The result of this study shows that the compressive strength of the original soil is 127,78 kPa, which increases to 153,46% after the addition of 5% cement. Then in the 14 days curing time, the compressive strength of soil-5% cement is 1684,09 kPa. The highest compressive strength value is 1711,60 kPa which is obtained when the soil is stabilized with 5% cement addition, 0.6% DIFA soil stabilizer, and 14 days of submersion.Keywords: compressive strength, CL-ML, stabilization, DIFA soil stabilizer, cement
Pengujian Kualitas NPK Biofertilizer Dalam Pengolahan Limbah Padat Serat Buah Sawit Bagus Anugrah; Adrianto Ahmad; David Andrio
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Along with the increase in CPO production, there are still many palm fruit fiber wastes that have not been utilized properly. One alternative to palm fruit fiber waste that is environmentally friendly is by applying the principle of 3R (Reduce, Reuse, Recycle) that is by composting. The composting process can be a strategy for recycling large amounts of sustainable organic waste. The purpose of this study was to determine the effect of POME addition on NPK quality with variations in POME of 0%, 20%, 30%, 40% and measurements were made on N, P, K, pH, water content, temperature, and compost produced compared to the standard the quality of compost SNI 19-7030-2004. In this study composting was carried out by aerobic windrow method. The results showed that the effect of increasing POME gave the best results as indicated by the content with pH 6.99, water content 42.44%, and temperature 32.06 0C. The highest quality of N elements and in accordance with SNI 19-7030-2004 is the addition of POME 20% which is equal to 2.61%. The highest quality of P and K elements is by adding POME 40% which is equal to, 1.1%, and 3.09% with composting time for 25 days. Thus the utilization of palm fruit fiber as compost is one of the solutions to sustainable environmental pollution control.Keywords : Composting, NPK, Palm Fruit Fiber, Palm Oil Mill Effluent (POME), Windrow.
Potensi Daur Ulang Sampah Domestik Di Wilayah Pengembangan V Kota Pekanbaru Rosdinar Hasibuan; Elvi Yenie; Jecky Asmura
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Waste Generation , Composition and Characteristics is very important planning waste recycling systems in waste management. This research was conducted in Development Area V with a total sample of 92 respon, 69 Payung Sekaki districts and 94 Marpoyan Damai districts. Determination of domestic waste generated based on the SNI 19-3964-1994 method carried out for eight consecutive days. The results showed that the average solid for household waste in Tampan Subdistrict was 0,150 kg / person / day. While the average amount of household waste in Payung Sekaki is 0,179 kg / person / day, and the average amount of waste generation in Marpoyan Damai sub-district is 0,132 kg / person / day. The largest composition of organic waste is dominated by organic waste at 52,41%. The results of physical characteristics in the form of compaction factors were 1,14 kg/liters, and chemical characteristics for water content were 20,68%, volatile content was 62,53%, ash content was 9.69% and fixed carbon was 12,8%. The potential for household organic waste recycling in the Development Area V is divided become III step, obtained from is recycling by recycable, composting and RDF (Reduse Derived Fuel). Keywords: generation , Composition, Characteristics of waste, Recycling potential Domestic waste.
Analisis Aliran Air Tanah Menggunakan Alat Ukur Paper Disc Velocimeter (PDV) Di Lahan Gambut Reski Daini Ramawilis; Sigit Sutikno; Rinaldi Rinaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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Peat restoration on peatlands is needed to restrain the rate of further damage from peatland ecosystems, one of which is a peat rewetting activity that is a way to re-wet the peatland using canal blocking to keepthe groundwater level at max 0.4 meters below the surface. Groundwater flow analysis was carried out in Lukun Village, Tebing Tinggi Timur District, Meranti Islands using Paper disc velocimeter (PDV)and groundwater level measurements using measuring pipes on 5 deep wells on the upstream transect and 5 deep wells on the downstream transect with a distance of 50 m and 100 m canal blocking. Theresults obtained from the Velocimeter Paper disc are the velocity and direction of flow in the upstream and downstream transects of the canal blocking, where groundwater flow rates are higher in thedownstream and lower in the upstream due to canal blocking. The benefit of having a canal block is that the groundwater flow rate in the upstream transect can be held up to the canal because the elevation ofthe channel's water level has been successfully raised.Keywords : peatland, canal blocking, paper disc velocimeter, groundwater flow.

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