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ASEAN Journal of Systems Engineering
Published by Universitas Gadjah Mada
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
ASEAN Journal of Systems Engineering (AJSE) is published by Master Program of Systems Engineering, Faculty of Engineering, Universitas Gadjah Mada as a mean for publishing scientific works in form of research papers, literature study, or scientific review on published articles, about systems engineering especially in the field of energy, industry and environment. The journal is published twice a year (June and December), in both print and online versions.
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Articles 7 Documents
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Search results for , issue "Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering" : 7 Documents clear
ANALYSIS OF PHOSPHATE IN LIQUID WASTE HOSPITAL Emmy Nurhayati; Muslikhin Hidayat; Sri Puji Saraswati
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Liquid waste generated by various activities in the hospital environment has the potential to pollute the environment if the parameters contained in it exceeds the specified quality standards. Parameters that most often exceeded the quality standard is phosphate (PO43-). Phosphate which exceeds the limit of 2 mg/L may affect the balance of aquatic ecosystems. One way to lower phosphate levels is using the coagulation flocculation process. This study aims to uncover the root cause of high levels of phosphate and recommendations for decline it and propose to install coagulation flocculation units.Research methodology starts from search and identification of phosphate levels of various source of phosphate in the hospital environment, from sump pit Dapur (Kitchen), sump pit Poli (Polyclinic), sump pit Lucas, sump pit Biara (Monastery), sump pit Genset and sump pit Carolus. Then doing the jar test in coagulation flocculation process using coagulant that is alum and lime with rapid stirring for 60 seconds and slow stirring for 15 minutes. Jar test was used to determine the optimal dose of coagulant for alum dose range between 50-150 (mg/L) and lime between 75-125 (mg/L). Coagulation flocculation units will be built on the largest phosphate producer with sampling as much as 6 times to determine the fluctuations of phosphate. Lab test of phosphate levels were performed using the spectrophotometric of SnCl2 method.The study data include phosphate levels from source of phosphate and phosphate fluctuations in the greatest source. Based on the results the largest source from pond Elisabeth. Jar test process is done by sampling as much as a liter of waste water taken from pond Elisabeth with total discharge of 26,640 L/day. Showed that the initial Phosphate of maximum from 7,1 mg/L decreased to 1,73 mg/L (75,63%) if given the alum dose of 50 mg/L and lime 125 mg/L which generates as much as 7,049 kg of sludge per day. Phosphate of average from 4,58 mg/L decreased to 0,73 mg/L (84,06%) with alum as much as 50 mg/L and lime as much as 75 mg/L which produces sludge as much as 5,378 kg/day. Phosphate of minimum from 2,23 mg/L decreased to 0,14 mg/L (93,72%) if given the alum dose of 50 mg/L and lime 75 mg/L with sludge as much as 4,931 kg/day.
REEVALUASI KELUARAN DAYA DAN OPTIMALISASI PEMBANGKIT LISTRIK TENAGA HIBRID DI KAWASAN PANTAI BARU PANDANSIMO mukhamad khumaidi usman; Samsul Kamal; Ahmad Agus Setiawan
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

pemerintah kabupaten bantul dan kemenristek membuat pembangkit listrik tenaga angin 60 kW dan pembangkit listrik tenaga matahari 27 kW di kawasan pantai Baru Pandansimo, pemanfaatan pembangkit listrik tersebut digunakan diantaranya untuk penrangan jalan, pembuatan es, dan warung kuliner.penelitian ini bertujuan untuk merancang model sistem pembangkit listrik tenaga hibrid dengan menggunakan software Homer dan Tora, menganalisa hasil simulasi dengan membandingkan prosentase kontribusi pembangkit listrik tenaga angin dan pembangkit  listrik tenaga matahari, dan menganalisa keekonomian dari embangkit  listrik tenaga hibrid.model pembangkit listrik yang optimal untuk software Homer  adalah kapasitas 2,5 kW dengan jumlah 24 unit untuk turbin angin dan 27 kW untuk solar sel, sedangkan untuk software Tora didapatkan model yang optimal dengan kapasitas masing-masing 1 kW, 2.5 kW dan 10 kW untuk turbin angin dan solar sel masing-masing berkapasitas 100 WP, 180 WP dan 220 WP. Hasil prosentase energi listrik yang dihasilkan dari simulasi Homer didapatkan PLTS sebesar 33 % dan PLTB sebesar 67 % dengan total energi yang dihasilkan sebesar 117.681 kW/tahun, sedangkan dari hasil simulasi Tora didapatkan prosentase PLTS sebesar 49 % dan PLTB sebesar 51 % dengan total energi yang dihasilkan sebesar 109.360 kW/tahun. Dari hasil perhitungan keekonomian proyek PLTH untuk harga jual di Pantai Baru Pandansimo yang ideal sebesar U$ 45 Sen/kWh, sedangkan harga jual di Pantai Baru Pandansimo sekarang sebesar U$ 3 Sen/kWh dengan nilai BCR sebesar 0.04 dengan demikian maka proyek PLTH dikatakan tidak layak dibangun. 
INFLUENCE OF EFFECTIVE SIZE AND LEVEL OF SUPERNATANT LAYER IN SLOW SAND FILTER PERFORMANCE Agustina Kiky Anggraini; Stephan Fuchs; Adriana Silva
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Slow sand filtration has been admitted as an old method of water treatment and has been widely used in the world. This type of sand filter is prominent in its simplicity, low cost, and effectiveness. The term effectiveness refers to the performance on removing particulate matter and microorganisms. There are some significant factors should be considered in the system of slow sand filtration, such as grain size distribution of media, sand type, bed depth, operation mode of filter, and filtration rate. This study focuses on the influence of different effective size of media and operation mode in slow sand filtration especially on removing turbidity. Grain size distribution is represented by the effective size (d10) and uniformity coefficient (Cu). In regard to the operation mode, both sizes were operated under intermittent operation mode and were compared in two different level of supernatant layer: decreasing level and constant level. Laboratory scale experiments were conducted using four filter columns. Two filter columns were filled up with Rhein sand in different effective size of d10 0.075 mm and d10 0.50 mm. Uniformity coefficient Cu 2.5 and curvature coefficient Cc 1 were the same for both d10. Every column was fed with the same concentration of artificial raw water. The artificial raw water was created from Heilerde (clay from Germany) which passed 0.063 mm sieve opening mixed with tap water. Fine grain size tends to be easier to be controlled in regard to filtration rate, and vice versa for the coarse grain size. Surprisingly, the coarse grain size was able to remove turbidity as good as the fine grain size. Permeability of column was also tested and it decreased along with the addition of Heilerde.
PENGARUH JENIS ARANG AKTIF AMPAS TEBU, TATAL KAYU DAN TEMPURUNG KELAPA TERHADAP KEMAMPUAN PENJERAPAN WARNA AIR SUNGAI SAMBAS Winda Apriani; Indra Perdana; Sri Puji Saraswati
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

The availability of clean water still poses problems in Indonesia. The need of clean water for Sambas City people still depends on river water. This river water comes from Sambas River which has bright yellow color (73.6 TCU), exceeding the allowed maximum level for clean water in accordance with the Regulation of Health Affairs No.416/MEN.KES/PER/IX/1990, which is 50 TCU, with low turbidity (23.3 TCU) and low pH (4.34). The characteristics of this river water indicate that the water color of Sambas River is true color. Level of this type of water color can be degraded by adsorption process using activated charcoal. It is easy to find raw materials of activated charcoal from waste sources containing carbon in Indonesia, especially West Kalimantan, such as bagasse, wood chips and coconut shell. Therefore, this research was conducted to identify the influence of activated charcoal types of bagasse, wood chips and coconut shell which are used as adsorbent to adsorp the color of Sambas river water and to identify the optimum dosage and duration of the process.Activated charcoal was made of bagasse, wood chip and coconut shell through pyrolysis process at a temperature of 5000C for 3.5 hours followed by chemical activation process using H3PO4 5% for 24 hours. The water was from Sambas river, Tanjung Mekar Village, Sambas, West Kalimantan. The adsorption process employed various types of activated charcoal (bagasse, wood chips and coconut shell); dosage (1, 2, 3, 4 and 5%b/v); and contact time (10, 15, 30, 60, 90, 120 and 180 minutes).The results indicated that different types of activated charcoal material in the adsorption process give different color level. The best treatment of batch process with 500 ml of Sambas river water was from the adsorption using activated charcoal of bagasse with an optimum dosage of 2% b/v and optimum contact duration of 90 minutes. It produced water color level between 50.00-52.00 TCU (meeting the standard of the Regulation of Health Affairs No.416/MEN.KES/PER/IX/1990).
PEMANFAATAN LIMBAH TULANG-TULANG IKAN MENJADI PELET PAKAN IKAN UNTUK MENCIPTAKAN KAWASAN ZERO WASTE DI PANTAI BARU PANDANSIMO KABUPATEN BANTUL Rizki Fitriyani; Arif Kusumawanto; Ria Miliati
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Pantai Baru Pandansimo is one of the attraction that is currently being developed Bantul district, located in Dusun Ngentak, Poncosari, Srandakan. Besides, we can enjoyed the beach, also served a variety of seafood from dozens of culinary stands, and there is also a Fish Auction Place (TPI). The existence of dozens of culinary stands, TPI and increasing tourists will cause the issue of waste cause the accumulation of organic waste such as leftovers in culinary stands plus there is no waste management system, the waste usually just discarded, dumped and left to rot that would cause smell and would disturb of tourist.This study aimed at finding out the extent positive impact of the utilization waste leftovers from stands culinary toward Pantai Baru Pandansimo to create zero waste region so as to reduce the quantity of waste into process fish feed. Then, to find out variation of formulation fish feed that good nutritional value so that can supply nutritional requirements of fish by Pearson Square method at various combinations of fish bone meal, shrimp waste meal, and rice bran. Chemical testing by proximate analysis and physical testing on the fifth variation to finding out variations of pellets which compatible with SNI feed the fish. So, pellets from waste can be beneficial to the surrounding community.The results of the study showed that utilizing waste leftovers from stands culinary in area Pantai Baru Pandansimo into fish is able to reduce the weight of organic waste by 2-3 quintals/month so the weight of waste from stands culinary can be reduced by 39%. Based on chemical test and physical test it was found that the optimal at the pellet P4 with a protein content of 34.34% and fat by 5.74% and P5 with a protein content 34.78% and fat by 5.14%. That results have appropriate of quality requirements for SNI-01-4087-2006 catfish, SNI-01-7242-2006 tilapia and SNI 7473:2009 carp. Waste management will provide improvements in environmental hygiene in the area Pantai Baru Pandansimo by 55% and improve waste management services by 65%. Sewage treatment will provide a positive benefit as much as 80% reduce the accumulation of waste and as much as 20% to educate people about the benefits of waste management.
DESAIN SISTEM INSTRUMENTASI PROSES DISTILASI FRAKSINASI BATCH BERBASIS KENDALI SUHU Muhammad Arman; Agus Prasetya; Sihana -
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Distillation column is a column that is widely used in both large industry and small and medium industries. Use of distalasi column on small and medium industries such as the distillation of essential oils. In the subsequent use of the distillation column used for purification or further process to obtain a higher quality product in the form of multstage distillation. In the process of multistages distillation,  temperature is an important component in the process, because of that controls the temperature has an important role. Temperature controllers available today are manual, which causes frequent inaccuracy of the distillation process, resulting in low product quality. Therefore automatic temperature control is required.In this thesis, instrumentation system of fractionation distillation process based of temperature control are designed. The design process notice the six important  point temperature in the distillation process, using a thermocouple as a temperature sensor, and LM35 as the cold junction temperature,  the 6218 USB as Data Acquisition Board, and the software LABVIEW 2010.The instrumentation system programming, displays the temperature from time to time at intervals of one second, the temperature statistics (min, max and average) as well as measurement results table. The program also features a choice (shaped slider) to  set the temperature for a flexible batch process. The response characteristics of the instrumentation system is less than one second, both in displaying measured data, response indicator, display graphs, and data tables. The instrumentation system is also designed to regulate the flow rate of the cooling water and container replacement indicator for each product distillation.
ENERGY MODELLING AND FORECASTING OF DAERAH ISTIMEWA YOGYAKARTA 2025 Eko Haryono; Deendarlianto -; Bertha Maya Sopha
ASEAN Journal of Systems Engineering Vol 2, No 2 (2014): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Daerah Istimewa Yogyakarta (DIY) is one of the provinces in Indonesia which does not have a backup or potential sources of non-renewable primary energy. The non-renewable energy demand until this time, such as oil,coal and gas is supplied from the outside. DIY is in Java Madura Bali (JAMALI) interconnerction system and has not had a large-scale power systems. While DIY has renewable energy sources such as hydro, solar, wind, wave and biomass energy. These renewable energy sources are alternative energy that have not been optimally used. The lack of reserve energy resources that resulting dependence of energy supply from other areas should receive special attention from DIY government. To meet energy demand, the energy resources development is required. Due to the energy resources development requires a long time and high cost, it is necessary to be supported by good planning in energy policy.The purpose of this study is to determine the balance of energy demand and supply of  DIY until 2025. Furthermore, the purpose of this study is to find out a mix number of renewable energy. The Indonesian government has launched a vision of 25/25 which expection in 2025, the mix number of renewable energy will be 25%.The results of this study indicate that in 2025, the Transportion Sector is the largest energy user sector in DIY at 52.37%, followed by Household Sector (32.70%), Commercial Sector (8.26%), Other Sector (4.64%), and Industrial Sector (2.04%). The high level of energy consumption in the Transportation Sector is caused by the increasing number of vehicles especially motorcycles and passenger cars considering DIY is a student and tourism city. In term of the type of energy used, in 2025, the gasoline is the greatest type of energy demand (41.8%), followed by LPG (23.97%), electricity (18.14%) and diesel oil (11, 74%). This indicates that the fuel oil is still the main energy source for the DIY community activities. When viewed from supply side, most of the energy needs in DIY are supplied from outside. If the development of enewable energy targets DIY reached, the renewable energy mix is obtained by 0.53 %.

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