ASEAN Journal of Systems Engineering
Not a member yet
78 research outputs found
Sort by
PENGARUH KOMBINASI LAPISAN PAPAN PARTIKEL DARI LIMBAH PARTIKEL AREN (Arenga pinnata) DAN LIMBAH SERUTAN BAMBU (Dendrocalamus asper) DENGAN JUMLAH PEREKAT UREA FORMALDELHIDA TERHADAP SIFAT PAPAN PARTIKEL
Full text linkThe need of wood for lumber industry in indonesia has got deficit over increasing population that make demand increase dramatically. One of effort that we could do is to find an alternative of wood like make particle board. Sugar palm waste and bamboo waste can be usde as board particle sources because it contains sellulose, hemisellulose and lignin as element of wood structure. The objective of this research is to find out the effect of urea formaldehyde addition and combination of layered particle from aren waste particle and bamboo waste shaving to the properties of particle board.Research methodology was completely randomized design with two factors. The first factor has three kind treatment were combination layered board particle with ratio face (sugar palm) : core (bamboo) : face (sugar palm) are 10%:80%:10%(K1), 20%:60%:20%(K2), 30%:40%:30%(K3). Second factor has three kind treatment were amount of adhesicve 5% (P1), 10%(P2) and 15%(P3). Parameter of property test were density, water absorption, thickness swelling, internal bonding, modulus of rupture and modulus of elasticity with using SNI 03-2105-2006.The research showed that particle layered composition factor affects significantly to internal bonding and modulus of elasticity but it doesn’t effect significantly to density, water absorption, thickness swelling and modulus of rupture. Meanwhile, adhesive factor affects significantly to all of property test. The best particle board made from combination layered arrangement 10% face : 80% core : 10% face (K1) with amount of adhesive 15% (P3). It has the best property as density 0,77 g/cm3, thickness swelling 22,84%, water arsoption 59,79%, internal bonding 3,56 kgf/cm2, modulus of rupture 182,48 kgf/cm2 and modulus of elasticity 16.352,9 kgf/cm2. Based on SNI 03-2105-2006, the properties test that had fullfilled were density, modulus of rupture and internal bonding but for water absorption, thickness swelling and modulus elasticity has not fullfill yet
PEMANFAATAN ZEOLIT DIAKTIFKAN DENGAN LARUTAN ASAM UNTUK PEMURNIAN BIODIESEL
Full text linkUtilization of zeolite activated by acid solution for biodiesel purification has been done. This research is conducted to find the mechanism of biodiesel purification from catalyst with activated zeolite, the effectiveness of the activated zeolite of various particle size, soaking time and purification temperature, the economic feasibility of biodiesel production by using this method and the more economical method by comparing the cost and performance of biodiesel purification using activated zeolite and using water and acid solution.This research has used cooking oil, methanol and sodium hydroxide to make biodiesel, sulfuric acid as activator and zeolite from Gunung Kidul which is filled into wash column with support from vacuum pump to purify biodiesel. The variable of the research is particle size of zeolite among others: 12 mesh <De< 20 mesh, 20 mesh <De< 40 mesh and 40 mesh <De< 80 mesh, soaking time 0, 15 minutes, 30 minutes, 1 hour and 2 hours, and purification temperature 27oC, 40oC and 60oC.Mechanism of activated zeolite for purifying biodiesel from catalyst has been investigated that activated zeolite is using the absorption rate where catalyst will fill the empty pores of zeolite and its cation exchange capacity where it will exchange cation in zeolite surface with cation of catalyst so that zeolite can purify the unwashed biodiesel from catalyst. Optimization of biodiesel purification using zeolite activated by acid solution method can be achieved with particle size of the zeolite 20 mesh <De< 40 mesh, 30-minute soaking time and purification temperature at 27oC. Economic analysis of the use of zeolites in the optimum condition within one year resulted Payback Period 8.68 months, Benefit Cost Ratio 1.86, Net Present Value Rp 431,173,257.44 and Return of Investment -138 % and the use of zeolite activated by acid solution more economical than the use of water and acid solution as purifying biodiesel because of cost savings can be made up to 86% of method of using water and acid solution
CALIBRATION OF 1-D NUMERICAL CODES SOFTWARE FOR SITE RESPONSE ANALYSES
Full text linkGround response analyses are used to predict surface ground motions for development of design response spectra, to evaluate dynamic stresses and strains for evaluation of earthquake hazards, and to determine the earthquake induced forces that can lead to instability of earth-retaining structures. The effects of local soil on ground motion are commonly evaluated by performing numerical analyses either in frequency or time domains.In order to evaluate the differences between frequency and time domain analysis, several analyses were conducted for homogenous stiff soil deposit with respective codes which are SHAKE and D-MOD2000. Linear and non linear analyses have been conducted. The non linear analyses with D-MOD2000 code have been carried out by using different frequencies in the Rayleigh damping formulation, i.e. fundamental and predominant frequency. For linear, PGA 0.1g is used in the analysis while for non linear PGA is scaled into three different value of 0.1, 0.3, and 0.5g.The results for both linear and non linear approach are similar. For the non linear analyses, it is shown that the curves derived using predominant frequency perform better than those using fundamental frequency. Main differences are for non linear approach where the differences between two codes are higher for higher input motion. As the calibration using predominant frequency between the two codes perform good, the respective codes are applied to evaluate soil response in Sant’ Agostino and San Carlo, in terms of PGA, due to May 20th 2012 Emilia Earthquake. There are 139 accelerometric station recorded strong motion. In this analysis, we consider one record which is in Mirandola station, the closest recording station where the Magnitude in epicentral area was 5.9 and 5.8 in Mirandola station. The recorded surface motion in Mirandola is transferred to the bedrock in 112 m depth and used as input motion for the two evaluated sites, San Carlo village and nearby municipality Sant’Agostino on 17 km distance from Mirandola station. The preliminary data presented here shows the PGA recorded in the bedrock of Mirandola station is 0.75g, while in Sant’Agostino and San Carlo is 0.92g and 0.81g
STUDI PERBANDINGAN PERLAKUAN BAHAN BAKU DAN METODE DISTILASI TERHADAP RENDEMEN DAN KUALITAS MINYAK ATSIRI SEREH DAPUR (Cymbopogon citratus)
Full text linkIndonesia is rich in plant biodiversity. Indonesia volatile oil development efforts through increased development of one plant of lemon grass, which is one of the essential oil producing plants known as Cymbopogon citratus. Lemongrass essential oil in the chemical industry used as raw materials in the manufacture of cosmetics, perfume, deodorant, deodorant soap, floor cleaners and detergents.The purpose of this study was to determine the highest yield of lemongrass essential oil distillation using the method of water distillation, water-steam, and steam to the treatment of intact leaves and chopped leaves and know the quality of essential oil of lemongrass with the treatment of raw materials and different methods of distillation, the design used by two factors: variation in the treatment of raw material (whole leaves and chopped leaves) and the distillation process variation (distilled water (boiled), water-steam distillation and steam distillation. Data obtained from the analysis of yield, specific gravity, refractive index, and oil content of the compound citral essential (lemongrass oil).This study uses three methods of distillation, the distillation of water, water-steam distillation and steam distillation is carried out on samples of intact leaves and chopped leaves of fresh lemongrass. The results yield calculation and testing of physics and chemistry, as well as in the method of analysis SPSS One-Sample Test Statistics for the lemongrass essential oil products.Based on the results of research on the treatment of raw materials and distillation methods can be concluded that the treatment of raw materials lemongrass intact leaves with water distillation method (boiled) at both the content yield 0.52%, 71.84% citral, specific gravity 0.8967 g/mL, and the refractive index of 1.4905. It is appropriate to mention that SNI 06-39-53-1995 yield 0.3%, the specific gravity of 0.8731 g/mL, and the refractive index of 1.4586. But the content of citral not meet SNI standards are 76.1%, but according to Guenther (2006) which states citral content of between 65% to 85%
DESAIN BIOBALL BERBAHAN KOMPOSIT BULU AYAM-RESIN POLYESTER: SIFAT MATERIAL, KARAKTERISTIK BENTUK DAN KARAKTERISTIK HIDRAULIK
Full text linkChicken Feather is main waste product of chicken processing as food, however it has a good potential for used in composite material. Material stiffness increase caused by hydrophobic Keratin which is contained in chicken feather both feather quill and feather fiber. Composite material as biofilter media potentially used to improve effectively of septic tank. The study was conducted to determine the effect of chicken feather fiber adding on density, impact strength and flexural strength of polyester composite, with addition of 10%, 15%, 20%, and 25% of feather fiber as variable. The best composition by mechanical test applied as biofilter material (bioball). Bioball characteristic was investigated to give some parameters used in wastewater treatment design, such as porosity of media, specific surface area, and density of bed media, spherical factor and biomass accumulation capacity. The parameters investigated in each bioball media with wide of bioball’s wall gap are 2 mm, 3 mm and 4 mm as variable. Chicken feather fiber composite has been used as bioball material provided light material 1,124 gr/cm3 in density. Increase in material strength was obtained by adding chicken feather fiber, bioball have been made has 44.291 MPa in maximum flexural strength and 5,781 kJ/cm2 in maximum impact strength. Bioball which has casted 5 cm in diameter, divided into three of types; bioball 2 (wall space 2 mm), bioball 3 (wall space 3 mm) and bioball 4 (wall space 4 mm). Bioball have been made has 260-369 cm2/cm3 of specific surface are and 0.78-0.83 of porosity. Based on spherical factor calculation bioball was more similar to parallel plate than rounded shape. Overall the shape was not rounded with spherical factor value between 0.23-0.358. Bioball 2 has the highest biomass capacity. Based on the test, biomass accumulation capacity of bioball 2 was up to 7.0 kg/m3 with estimation of backwashing time is every 20 hours
TESTING OF POLONITE, GAZOBETON, PAREPARE BLACK VOLCANIC SAND BEACH, AND KADIDIRI CORAL BEACH SAND FOR PHOSPHORUS REMOVAL FROM WATER AND WASTEWATER IN CONSTRUCTED WETLAND
Full text linkCharacteristics of domestic wastewater in Indonesia generally contain phosphorus 4-15 mg/L. Phosphorus in wastewater must be treated to reduce the phosphorus content according to the Indonesia: Government Regulation No. 82/2001 management of water quality and control over water pollution, maximum allowable levels is 0.2 mg/L. A 1953 report from the Max Planck Institute in Germany by Dr. Kathe Seidal discusses the possibility of using wetland plants to remove nutrients from wastewater. The objectives of this research are to ascertain whether Polonite, Gazobeton, Parepare black volcanic sand beach and Kadidiri coral beach sand can be used as sorbent materials and to obtain the data of phosphorus sorption capacity, efficiency and phosphorus adsorption capacity constant of those materials. This research consists of batch and box experiment. Batch experiment was conducted for all material by mechanically shaking sample for several minutes with varying concentrations of the artificial phosphorus solution prepared from KH2PO4 and wastewater. Box experiment was conducted to evaluate the phosphorus removal by Gazobeton in long term experiment. The highest sorption capacity was attained by polonite 0.917 g/Kg, was followed by gazobeton 0.504 g/Kg, Parepare black volcanic sand beach 0.174 g/Kg and then the finally Kadidiri coral beach sand 0.131 g/Kg. The phosphorus sorption efficiency by Polonite, Gazobeton, Parepare black volcanic sand beach and Kadidiri coral beach sand each Kg are 91%, 50%; 17% and 13% respectively. Phosphorus adsorption capacity constant of polonite is 4906 L/g gazobeton is 115 L/g Parepare black volcanic sand beach is 19 L/g and Kadidiri coral beach sand is 14 L/
HIGH THROUGHPUT STUDIES OF HYDROGEN EVOLUTION ELECTROCATALYST FOR WATER ELECTROLYSIS
Full text linkThis thesis presents a study of hydrogen evolution electrocatalyst for alkaline water electrolysis. Hydrogen production through the electrolysis of water requires the development of new electrocatalysts in order to reduce the hydrogen evolution over-potential of the cathode in order to make water electrolysis more competitive and efficient. An alternative approach in the optimisation of water splitting electrocatalyst may Be the modification of the metal electrocatalytic behaviour by supporting nano-particles on oxide support. Development of the electrocatalyst material for hydrogen evolution reaction in alkaline electrolyte may obtain more stable hydrogen evolution reaction.Pt on TiO2 electrocatalyst has been synthesized by applying high throughput Physical Vapor Deposition (HT PVD) method. Electrochemistry measurements of Pt on TiO2 have been used to study the characteristic and stability of the electrocatalyst for hydrogen evolution reaction in alkaline electrolyte for water electrolysis. XRD confirmed that the phase of TiO2 were amorphous and anatase after annealing for 6 hours at the temperature of 450oC. The thicknesses of TiO2 both for amorphous and anatase were 200 nm.Similar electrocatalytic behavior are presented both for Pt on amorpous TiO2 and Pt on anatase TiO2 from electrochemistry measurements using cyclic voltammetry and potential step on the 10 x 10 E-chem arrays in alkaline electrolyte (0.5 M NaOH). Higher currents are seen in the larger particle size of platinum in TiO2 both for amorphous and anatase phase. The hydrogen evolution reaction starts at the potential below -0.8 V vs RHE. The potential for hydrogen evolution reaction is shifted to the low potential. Larger particle size of platinum shows lower potential of hydrogen evolution reaction.Pt on TiO2 tends to be a stable electrocatalyst for hydrogen evolution reaction in alkaline water electrolysis. It is because hydrogen evolution reaction occurs at low potential. Anatase phase of TiO2 is more stable than amorphous TiO2, hence, Pt on anatase TiO2 could be better than Pt on amorphous TiO2 for hydrogen evolution reaction in alkaline water electrolysis
SISTEM PENURUNAN KADAR KROM (III) LIMBAH CAIR INDUSTRI PENYAMAKAN KULIT DENGAN KOMBINASI PRESIPITASI MENGGUNAKAN NATRIUM HIDROKSIDA DAN ADSORPSI MENGGUNAKAN BAGASE FLY ASH
Full text linkWastewater in the tannery industry is the main waste due to the use of a great amount of water and chemical substances in the process. Wastewater which contains chromium from the tanning materials potentially causes physical and chemical changes in the environment. Chromium is harmful heavy metal which is non-degradable and able to cause danger towards environment and human health. Therefore, it is important to employ treatments before discharging the wastewater to the environment. One of the known methods to reduce the content of heavy metal is precipitation using sodium hydroxide. However, precipitation alone can not meet the strict quality standard for tannery industrial wastewater. Adsorption using bagasse fly ash (BFA) is a key promising tertiary method to achieve the high treatment standard. BFA is a low cost adsorbent since it is prepared from solid waste from sugar industry. This research aims to study optimum operating condition of the implementation of a combination of precipitation and adsorption methods for reducing chromium (III) in the tannery industrial wastewater.Initially, this study used synthetic waste to obtain optimum conditions for adsorption method. The optimum conditions were then tested using real waste from tannery industry. Synthethic waste used in this process was Cr(NO3)3.9H2O. Adsorption process used both activated BFA as well as raw (un-activated) BFA. Concentration of crom (III) in the filtrate was determined by AAS (Atomic Absorption Spectrocopy). Parameters of the study were pH of the precipitation, and pH of the adsorption.Results of this study showed that the optimum pH to chrom (III) concentration reduction is achieved from the combination of precipitation at pH of 8 and adsorption at pH of 5. The effectiveness of the concentration reduction of chromium using combination of both of these methods managed to lower the concentration of chromium from initial concentration of 544 mg/l to 0,18 mg/l (using activated BFA), with the effectiveness of chromium reduction 99.97%. This result complies with the standard based on Yogyakarta Governor's decree number 7/2010 about wastewater quality standard for wet blue leather industrial activities, which is 0,4 mg/l