Seminar Nasional Teknik Kimia Kejuangan
Not a member yet
523 research outputs found
Sort by
Kajian Teknis Pencucian Timah Menggunakan Jig Di TB 1.42 Pemali, Kabupaten Bangka Induk, Propinsi Bangka Belitung
Get PDFPit 1.42 Pemali TB is one of the tin mines owned by PT. Timah (Persero) Tbk.. This pit is located in District Pemali, Bangka, Bangka Belitung Province. Mining method applied is the Open Pit. The aim of the study was assessment of how the jig so as to obtain optimum Sn concentration, with variable stroke length as the independent variable, and variable frequency punch, slope jig, size spigot, additional water volume, shape and size of the jig bed, kecepatan runoff as a fixed variable. Sn sample retrieval results in the form of bait, concentrate, tailings are then used as a reference for a discussion of how the jig concentration equipment.From the data of the current observation based on the current state, the length of the secondary jig left punch= 7 mm and length of secondary jig right punch = 6 mm. Sn generated secondary jig left at 0.78% Sn and 76.9% of its recovery. For secondary jig right Sn obtained at 0.90% Sn and his recovery was 76.5%. Then concentrate on the secondary jig jig left and right secondary mixed so as to obtain the overall content of Sn at 0.8394 and 76.7% of the overall recocery. Requirements that must be met in the process of concentration for secondary jig is 5-10% Sn.Attempts to obtain optimal acquisition Sn concentrations of secondary jig that is by changing the stroke length of the secondary jig to 5 mm left and right secondary jig into 4 mm. Secondary levels jig concentrates on the left obtained at the time of stroke length of 5 mm was 7.34% Sn with 98.1% recovery. While the secondary jig right length obtained at 6 mm punch is 8.35% with a recovery of 98.2% Sn. In order to obtain the overall results, the experimental results of the secondary jig left and right in the mix. The results obtained are 7.7923% Sn Sn with 98.1% recovery. By looking at the results obtained concentrate grade, the ideal length of punch used is 5 mm and 4 m
Penerapan Green Solvent: Amonium Hidroksida pada Proses Pretreatment Cangkang Kelapa Sawit sebagai Adsorben Alami dalam Pengolahan Limbah Cair Sawit
Get PDFThe large quantities of palm oil industry wastes produced are Palm Oil Mill Effluent (POME) and palm kernel shell. The palm kernel shell is the palm oil industry waste which is reach 60% of palm oil production. POME contains 0.6-0.7%w/w oil and grease which has to be treated efficiently before it may be discharged. The oil in POME is a dangerous pollutant for the aquatic environment because it is toxic to microorganisms that live in the water. Oil in POME can be reduced through adsorption process using palm kernel shell which is the solid waste of palm oil industry itself as bioadsorbent. The method introduced in this study is the pretreatment of the bioadsorbent using green solvent, NH4OH solution with concentrations of 1, 1,5, and 2,5 M. In the adsorption process, 100 mL of 6000 ppm oil solution was added whereas the dosages of adsorbent varied as follow 2, 3, and 4 gram. The adsorption process was done in the batch system, room temperature, 40 minutes contact time, and 200 rpm speed of stirring. The analysis including the yield of oil adsorbed on adsorbent and moisture content. The results showed that the pretreatment with NH4OH solution has decreased oil content in POME up to 66.7%w/w
Adsorpsi Logam Fe (II) dalam Limbah Cair Artifisial Menggunakan Komposit Kitosan-Karbon Aktif Cangkang Buah Karet
Get PDFHeavy metals have been recognized as harmful environmental pollutant known to produce highly toxic effects on different organs and systems of both humans and animals. Removal of a heavy metal ion Fe (II) from artificial wastewater has been successfully performed by adsorption process using chitosan-rubber seed shells activated carbon (CRSSAC) composite in a batch system. CRSSAC1, CRSSAC2, and CRSSAC3 were prepared by adding 1, 2, and 3 grams of rubber seed shells activated carbon into 100 ml chitosan solution then dropped into a 3% STPP-Ethanol solution. The adsorption process has been conducted for wastewater at pH 5 by adding 3 grams of the composite into 50 ml of solution. Samples were stirred using a shaker with time variations on 5, 10, 15, 20, and 25 minutes at a speed of 150 rpm. Samples were filtered and then analyzed using AAS. The results showed that the best conditions were obtained for CRSSAC1 with adsorption time of 25 minutes which can decrease 0.1236 mg Fe (II) for a gram of composite
Pengaruh Aerasi dan Penambahan Nitrogen terhadap Laju Pertumbuhan Nannochloropsis sp.
Get PDFIndonesia has plenty of natural resources which has not utilized yet, such as microalgae. Many valuable components, such as natural antioxidants which can be explored from it. The goal of this research is to maximize the growth of microalgae (Nannochloropsis sp.) so that it can produce more biomass. The variables observed were the addition of oxygen through aeration and nitrogen using NaNO3 nutrients (450 µmol/L, 600 µmol/L, 750 µmol/L, and 900 µmol/L) during the growth of microalgae. The amount of biomass produced was measured using centrifuge and drying method. The results showed that the aeration and the addition of NaNO3 nutrients could increase the growth rate and yield of biomass from Nannochloropsis sp. The optimum condition was obtained at the cultivation with aeration and 900 μmol/L NaNO3 added. The highest biomass produced was 25.975 g (dry basis)/L medium
Uji Kemampuan Adsorpsi Zeolit Alam Teraktivasi Asam Sulfat pada Penurunan Bilangan Asam Biodiesel
Get PDFBiodiesel production from transesterification leaves to high content of acid fat, therefore in order it is usable, it is to be first purified. This research was to identify the effects of zeolite mass ratio tobiodiesel mass generating the lowest value of acid, effects of zeolite mass ratio to biodiesel mass generating the lowest density, the increase of esther metyl. The method adopted for purifying the biodiesel in this research was absorption process with activat ed natural zeolit as absorbent. In order to attain the maximum condition in the absorption process, it is necessary to identify the effect of biodiesel weight ratio to the zeolit mass generating to lowest value of acid and density. Accordingly, both were treated as independent variabls. The variations ratio of zeolit mass of biodiesel mass were 0,075; 0,151; 0,227; 0,303; 0,378. The resuls of the research showed that increasing ratio of zeolite mass to biodiesel mass will lower acid nunbers and density of biodiesel, The content of methyl ester biodiesel before purification using adsorbtion with activated zeolite adsorbent was 44.66% while after purification 55.78
Optimasi Proses Hidrolisis Pati Tapioka Menggunakan Glukoamilase Terimobilisasi pada Silika MCF 9.2T-3D Berdasarkan Response Surface Methodology (Box-Behnken Design)
Get PDFHydrolysis of tapioca using immobilized glucoamylase was studied following a statistical experimental design. The Response Surface Methodology (RSM) based on Box-Behnken design was used in order to obtain optimum operating conditions for the hydrolysis process and to obtain the influence of interaction between variables. There were 3 (three) variables used in this study, i.e. temperature, pH of acetate buffer and agitation speed, which were varied in 3 (three) levels. It was found that the suitable model for this process was the quadratic model. Fit of the model was expressed by the coefficient of determination (R2), which was to be 0.9978 indicating that 99.78% of the variability in the response can be explained by the model. Significance of the model was validated by the F-test for ANOVA, namely p≤0.0001. The model validation showed a good agreement between the experimental results and the predicted responses. The statistical analysis also showed that the optimum dextrose equivalent value (68.406% (w/w)) were obtained at 70°C, 140 rpm and pH 4.6.
Pengaruh Metode Pembuatan Katalis Metal/Zeolit Y Terhadap Karakterisasi dan Aktivitasi Katalis
Get PDFThe ion exchange method has been widely used in the manufacture of catalysts. The catalyst produced by ion exchange method has different characterization and performance with other methods. This chapter describes the comparison of characterization and performance of metal loaded zeolite Y catalysts by impregnation and ion exchange methods. The catalyst characterization was analyzed using X-Ray Diffraction (XRD). While the catalyst performance used as a catalyst for coal tar to liquid fuels. The loading of metal to zeolite using ion exchange method was increased the crystallinity of zeolite. However by using ion exchange method was decreased the acidity of zeolite. The yield of liquid fuels using impregnation method Co-Mo/zeolite Y catalyst is higher than the ion exchange method Co-Mo/zeolite Y catalyst. However, catalyst obtained by ion exchange method results in higher composition of gasoline fraction
Isolasi Nano Selulosa dari Ampas Tebu dengan Proses Blending pada Berbagai Variasi Konsentrasi
Get PDFThis research aimed to create nano cellulose from bagasse by simple method and equipment. Nano celllulose were isolated from bagasse in three distinct stages. Initially, the fibers were treated with 5 wt.% NaOH solution followed by bleaching using 5 wt.% hydrogen peroxide (H2O2) in alkali condition (pH 11) to remove hemicelluloses and lignin. Then, cellulosic fibers were mechanically separated by using kitchen blender to produce nano cellulose. FT-IR analysis demonstrated that the treatments could separate gradually of lignin and hemicelluloses from the fiber. FT-IR analysis also indicated a blending result with concentrate of 0.7 wt.% has the highest crystalline structure. This results were also supported by X-ray analysis. X-ray diffraction studies revealed that Nano-cellulose (0.7 wt %) obtained have higher crystallinity (83.75%). The type of cellulose that was formed is cellulose I, as expected. Finally, It could be told that blending by using kitchen blender might be one of an alternative way to produce a nano cellulose
Peran Perguruan Tinggi dalam Penurunan Emisi Gas Rumah Kaca Melalui Pengelolaan Sampah Kantin
Get PDFHigher education institutions can play a role in reducing greenhouse gas emissions through solid waste management. One of the solid waste sources in the campus is a canteen. Surabaya University (Ubaya) is one of the higher education institutions in Surabaya has two canteens that generate waste everyday. In the canteen waste is separated into food waste, food cardboards and plastic bottles. Food waste and food cardboards has not processed yet. A research related to the potential utilization of canteen waste need to be conducted. The aims of the research are determining the amount of organic waste generation in Ubaya canteen and calculating the greenhouse gas that can be derived if organic waste is processed into biogas. The scope of calculation was CH4 generation. The research is conducted in the Keluwih Canteen. The estimation of canteen waste is taken for ten days. The surveys conducted during November 2017. The calculation of green house emission from solid waste was referred to Intergovernmental Panel on Climate Change (IPCC) 2006 guidelines. The results of the research indicated that the average quantity of food waste is 6,3 kgs per day, 5 kgs per day of food cardboards and Surabaya University can contribute to reduce green house gas emission (CH4) about 0,85 kg CH4 per day
Pengaruh Suhu dan Laju Alir Pengeringan pada Bawang Putih Menggunakan Tray Dryer
Get PDFGarlic is one type of plant commonly used as a spice and seasoning cuisin. Garlic is very usefull, so it needs to be preserved to extend the shelf life. One of them is with manufacture of garlic powder. In this research, garlic powder was made using tray dryer with temperature variation (50oC, 60oC, 700C) and drying flow rate (1,5m/s, 2,5m/s, 3m/s). Garlic powder that has been produced then analyzed the water content, ash content and vitamin C. Based on the results of research on variations of flow rates and temperature variations, the longer drying time caused moisture content decreases as the longer drying time. Water content that has occupy the SNI is obtained for all temperature variations and flow rate of less than 12%. The highest level of ash and vitamin C content for temperature variation and flow rate was obtained at flow rate of 1,5 m/s and temperature of 50oC with ash content of 2,97% and 2,40%, and vitamin C content of 22,10 mg/100g and 26,52 mg/100g