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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
Engineering
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Articles 3,145 Documents
 268   269   270   271   272 
Pemanfaatan Chlorella sp. Untuk Menyisihkan Nitrogen Total Pada POME Dengan Variasi Laju Alir Gas CO2 Menggunakan Flat-Photobioreactor Meisy Dhyta Amelia; Shinta Elystia; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

POME contains organic matter that can be utilized by microalgae Chlorella sp. Organic material is used as a source of nutrition for growth so as to reduce the content of pollutants in POME. In this research measurements of the growth rate of microalgae Chlorella sp. cells and removal of Total Nitrogen. The research was conducted in batch using flatphotobioreactors with variations in the CO2 gas flow rate was 0,4 L/min; 0,6 L/min; and 0,8 L/min and contact time 0, 1, 3, 5, and 7 days. Based on the results of the research, the highest growth rate of Chlorella sp. cells and the best efficiency of total nitrogen removal were at the CO2 gas flow rate was 0,6 L/min on the seventh day was 0.381/day and 84.4% Keywords: Chlorella sp., POME, CO2 Gas Flow Rate, Flat-Photobioreactor, CO2 absorbed
Studi Isoterm, Termodinamik Dan Kinetika Adsorpsi Zat Warna Direct Brown Menggunakan Hidroksiapatit Defisien Kalsium Delita, Fuji; A, Yelmida; Herman, Syamsu
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Dye waste produced by industries contains dangerous and poison materials that could pollute the environment. In this study, hydroxyapatite calcium deficient will be used as medium of adsorption. This process will determine the isotherm models, thermodynamic, and adsorption kinetics models. The dye adsorption process was carried out at various temperatures and initial concentration of dye at a rotating speed of 250 rpm. The maximum adsorption capacity raised at a concentration of 10 ppm and temperature of 30ᵒC with the adsorption capacity of 87.5%. The isotherm model of the direct brown dye adsorption process follows the Langmuir model, since the Langmuir model with R2 approaching to 1 at all variation of temperatures. The adsorption kinetic model of direct brown followed the pseudo second order with 0.9992 of R2 used 40ᵒC of temperature, the initial concentration of direct brown solution was 40 ppm with an adsorption rate constant of 0.052. This study applied physical adsorption which using heat capacity of adsorption (ΔH) of -40,94 kJ / mol which is an exothermic process. Key words : Adsorption, Hydroxyapatite, Konsentration, Dye.
Pemanfaatan Ampas Sagu Untuk Produksi Bioetanol Hendra, Alfino; Chairul, Chairul; Zultiniar, Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Sago waste is a lignocellulosic material that can be used as a raw material for making bioethanol. The lignin content in lignocellulose can inhibit the rate of saccharification by blocking access to cellulase enzymes in cellulose. The pretreatment stage is the initial stage of the conversion process of lignocellulose to bioethanol with the aim of reducing lignin levels in lignocellulose. The next steps in the conversion of lignocellulosic material to bioethanol are saccharification and fermentation. In this study, the pretreatment stage was carried out using 10% NaOH solution at a 4 bar pressure reactor and a temperature of 140 oC, while the saccharification and fermentation stages were carried out simultaneously (SSF) with the help of cellulase enzymes and yeast Saccharomyces cerevisiae at temperature conditions of 30 oC and pH 5. The research was carried out by varying the ratio of sago waste with NaOH solution and the time of the pretreatment process. The ratio of sago waste and the solvent used were 1:5, 1:6, and 1:7, while the processing time started from 20 minutes, 30 minutes and 40 minutes.. The results of the initial treatment stage were then continued with SSF for 0 hours, 24 hours, 48 hours, and 72 hours with the highest bioethanol content of 12% at 72 hours. Keyword: Bioethanol, lignocellulose, pretreatment, sago solid waste, SSF
Pengaruh Rasio Solid Liquid Dan Penambahan Graphene Nanosheets Terhadap Kuat Tekan Mortar Geopolimer Berbasis Palm Oil Fuel Ash (POFA) Dan-Flyash Batu Bara Muhammad Zaqi; Amun Amri; Desi Heltina
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Geopolymer mortar is a material that has high SiO2 and Al2O3 content and has the potential to be used as a base for making geopolymer mortar. This study aims to make geopolymerbased mortar (POFA) and coal flyash with the addition of graphene, and variations in the addition of graphene to the mechanical and morphological properties of the geopolymer mortar. The preparation of the geopolymer mortar includes several steps, namely the preparation and mixing of materials with various solid liquid ratios of 72:28, 60:40, and 80:20, then proceed with the preparation of an activator alkaline solution (10 M NaOH + Sodium silicate) and the addition of graphene with variations of 0%, 1% wt, 2% wt, and 3% wt. The results of the morphological analysis showed that the increased cavity that was formed increased along with the increase in the amount of graphene added. While the results of the compressive strength test showed that the highest compressive strength was obtained at 19,2 Mpa at a solid liquid ratio of 60:40 and the lowest compressive strength was obtained at 12,8 Mpa at a solid liquid ratio of 80:20. Keywords : geopolymer mortar, coal fly ash, graphene, POFA
Pengaruh Gradasi Dan Bentuk Butiran Pasir Terhadap Kuat Gesernya Simanjuntak, Lambok Jadiaman; Yusa, Muhamad; Fatnanta, Ferry
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Gradation and grain shape of sand are some of the factors that influence the shear strength of sand. This needs to be considered, so that the effect can be maximized for construction related to sand. The purpose of this research is to find out how to analyzethe shape of the sand grains and analyze the behavior of the angle of friction (ϕ) due to the influence of the grading and shape of the grains. The test is carried out by dividingthe gradation, which consists of three variations with a relative density of 70%. Gradation 1 is dominated by medium granules as much a 100%, gradation 2 is dominated by coarse granules as much a 60%, and gradation 3 is dominated by finegranules as much a 60%. The shape of the sand grains is divided into two forms, namely the group of angular and rounded grains, which are distinguished based on themorphological parameters of the granules namely roundness (R), sphericity (S) and regularity (ρ). The morphological parameters of the granules are analyzed usingimageJ. The results showed that the analysis of grains shape of sand using imageJ, obtained levels of grain shape from the two sands, namely sub-angular and subrounded.The effect of gradation on angle of friction (ϕ) is gradation dominated bycoarse grains of 60%, namely gradation variation 2, and which has a long grain distribution, namely gradation variation 3 has a higher angle of friction (ϕ) compared to gradation variation 1. Comparison of the angle of friction (ϕ) between the grainshape of sand, that is sand with a sub-angular shape has a higher the angle of friction (ϕ) compared to sand with a sub-rounded shape.Keywords: Sand, gradation, particle shape, imageJ, roundness (R), sphericity (S), regularity (ρ), angle of friction (ϕ).
Karakterisasi Dan Potensi Penyisihan Pada Pome Menggunakan Proses Ozonasi Shifa Rayni Efendi; David Andrio; Fri Murdiya
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
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Abstract

POME has high pollutants. POME is thick brown. The color of POME is associated with complex compounds derived from polymerization between the degraded products lignin and tannins, and POME has a high chemical composition and concentration of simple organic compounds. POME is a major source of water pollution because it is difficult to decompose and is dangerous for the environment. This research aims to investigate the characteristics of POME by analysis using ozonation. The results showed an decrease in COD from 58.144 mg/L to 56.181 mg/L. Keywords: POME, ozonation
Karakterisasi Dan Potensi Pemnafaatan Palm Oil Mill Effluent (POME) Dikki Awanda; David Andrio; Elvi Yenie
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Palm Oil Mill Effluent (POME) contains high concentrations of organic pollutants. The high organic concentration in POME makes it suitable reused as an energy source. This study aims to investigate the characteristics of POME and analyze the potential of POME. The results of this study indicate the concentration of total and soluble COD in POME 32,000 mg / L and 16,000 mg / L, VSS amounting to 6,000 mg / L and pH 4.2. With high organic concentration then POME can be utilized as bioethanol and biogas. Keywords: Palm Oil Mill Effluent (POME)
Sistem Pengukuran Daya Mekanik Penggerak Rotary Friction Welding Menggunakan Sensor Strain Gauge Pada Iron Holder Belt Hambra Hidayatullah; Yohanes Yohanes
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
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Rotary friction welding is a type of welding that belongs to the solis state type where welding does not require filling material to perform welding. This study aimed to measure the mechanical power of the rotary friction welding machine drive engine, before welding, during welding, and after welding using a strain gauge sensor attached to the stretch rod, for motor speed measured using an optocoupler sensor, the measurement process. This mechanical power included the design process, design, calibration settings, and testing of stretch rods. The stretch rod was installed as a substitute for the iron holder belt with the dimensions of the stretch rod 200 mm x 30 mm x 25 mm, for the thickness of the stretch rod where the strain gauge sensor is attached was 5 mm. The sensor used for reading the magnitude of the stretch on the stretch rod was the 120 ohm strain gauge, the speed read on the optocoupler was directly proportional to the amount of strain read on the strain gauge. In the welding process, a pressure of 2 bar to 4 bar is applied which will result in heat on the objects that rub against the object until it reaches the forging temperature of the object and a pressure of 6 bar is given as the forging pressure for weldingthe amount of mechanical power will be obtained by converting the torque, strain, and engine speed data obtained. Keywords: Friction Welding, Mechanical Power, Strain Gauge Sensor.
Uji Kinerja Fotokatalis Komposit Tio2-Graphene (Cocopas) Untuk Degradasi Fenol Fadhila Ulfa; Desi Heltina; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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Abstract

Phenol is a chemical compound that is one of the hazardous industrial wastes. An excessive concentration of phenol can cause damage in the environment and human life. Phenol removal can be done by photocatalysis process using photocatalyst materials such as titanium dioxide (TiO2).TiO2 was composited with graphene to increase the photocatalytic activity of TiO2. Graphene was modified with cocoPAS before to disperse graphene when composited with TiO2. TiO2-Graphene (cocoPAS) composite was characterized by SEM. Based on the results of characterization, it can be seen that TiO2 particle loaded on the graphene sheet which indicates that the composites have been successfully made. The performance of the TiO2-Graphene (cocoPAS) composite in phenol degradation was tested in a photocatalysis process for 4 hours. A variable in this photocatalysis process is photocatalysis temperature (40 and 50 oC). the most effective TiO2-Graphene (cocoPAS) composite performance was achieved when the photocatalysis temperature is 50 oC, which can degrade phenol by 97% in 4 hours.Keywords: CocoPAS , degradation, photocatalysis, phenol, graphene, titanium dioxide
Optimasi Jaringan Microwave Link 4G Point To Point Benai-Teluk Kuantan Provider Indosat Rahmat Maulana; Yusnita Rahayu
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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This paper describes the condition of Indosat's 4G microwave link network in the Benai-Teluk Kuantan area using pathloss software. Microwave link functions to transmit information from one place to another without any interference. PT. Xerindo Teknologi is a company that provides services through the internet network of all providers including Indosat. The design carried out by PT. Xerindo Teknologi simulated with Pathloss software to experience some obstacles such as trees and buildings. These caused a nonoptimal network, with a network speed of around 2-3 Mbps from the speedtest results. To enhance the microwave link network conditions in the Benai-Teluk Kuantan area, the solution will be to change the antenna height that has been done previously. Changing the antenna height results in optimal network speed, with a network speed of around 7-8 Mbps. .Keywords: Microwave link, 4G Technology, Network planning and network optimization.

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