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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Ilmiah Biosaintropis (Bioscience-Tropic) Unri Conference Series: Community Engagement Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks
Drastinawati Drastinawati
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Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Engineering Environmental Science Medicine & Pharmacology Social Sciences Other

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Pengaruh Kuat Arus Dan Laju Alir Pada Pengolahan Air Payau Menjadi Air Bersih Dengan Metode Elektrokoagulasi Menggunakan Reaktor Listrik Kontinyu Jhon Alperdo; Idral Amri; Drastinawati Drastinawati
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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Brackish water was a usual the result of saltwater intrusion to the groundwater. It is due to the environmental degradation. Brackish water containing high levels of metal pollution like Fe, Cl, Mn, Zn, etc. Brackish water also usually having high levels of TDS and pH values brackish water acidic.Therefore, brackish water should be treated first that fit for using as fresh water. Brackish water treatment plant run based on the electrocoagulation. This method has the potential to purify brackish water and decrease the metal content contained such as Fe without the addition of coagulants. The purpose of this study was to determine the application of electrocoagulation to be used to neutralize pH, and reduce levels of TDS and Fe on brackish water and also to determine the effect of changes in flow rate and current to neutralize pH, and reduce TDS and Fe levels in brackish water. The parameters tested included pH, TDS (Total Dissolved Solid), and Fe using AAS. The electrocoagulation process uses electrical power that flows in the direction of the electrode. The electrocoagulation reactor was paired with a cable connected to the power supply then connected to an electric current with variations currents (1,4 ;2 ; 2,6 A) and variations in flow rate (0,53 ; 1,15 ; 2,7 L/min). The results of this study found that the optimum conditions were obtained at current of 2,6 A and flow rates of 0,53L/min with increasing pH from 5,8 to 6,8, decreasing TDS from 480 to 295 mg/L, Fe decrease of 66,97% from 0,5971mg/L to 0,1972 mg/L. Therefore, based on the results of parameter being tested, brackish water processed with electrocoagulation using continuous electric reactor is in line with the portable water quality standards based on Permenkes RI No.492-2010.Keywords: Brackish water, current, electrocoagulation, flow rate
Pemisahan Emas Pada RAM (Random Access Memory) Komputer Dengan Metode Elektrolisis Edo Prima Arif; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Gold metal has been using in electronics and telecommunication industry, for example RAM(Random Access Memory)computer. The separation of gold from the RAM(Random Access Memory)computer has been done in this study. To get the maximum results in the separation of the gold used variations potential difference( 6; 9; 12 volt ) and the type of precipitant (NaHSO3 and H2C2O4) . In this study, a certain number of samples is used samples RAM(Random Access Memory)computer electrolyzed H2SO4 for 1 hour. The precipitate formed is separated from the filtrate. The precipitate was dissolved in Aqua Regia at a temperature of 70˚C for 30 minutes further diluted with Aqua DM until the volume is 50 mL . Au concentration was analyzed by AAS(Atomic Absorption Spectrophotometry)and Au deposited with NaHSO3 and H2C2O4 . Based on the analysis result, the maximum Au concentration at the former RAM(Random Access Memory)computer is equal to 0,5054 ppm with potential 12 volt. For 5 grams of the sample , the maximum weight of Au precipitate obtained 0.97 miligrams by using H2C2O4 as a precipitant .Keyword: Au concentration, NaHSO3, H2C2O4, H2SO4
Pemisahan Emas Pada VGA (Video Graphics Array) Komputer Dengan Metode Leaching Dan Presipitasi Juliani Dafis; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The development of electronics technology is correlated to increasing use of electronic device, it causes a buildup of electronics waste every year. An example is Video Graphics Array (VGA) Computer still has the precious metals components. In this research, gold separation process of VGA computer has been done by using variation ratio samples : HNO3 solvent (1: 3; 1: 6; 1: 9) and two precipitants NaHSO3 and H2C2O4. Initially VGA cut into size from 5-10 mm, then it was leaching by HNO3 solvent at 70 ℃ for 1 hour. Afterwards filtrate is separated from residual sludge. Residual sludge was leaching using Aqua regia at 70 ℃ for 30 minutes to dissolve gold. Then, Au filtrate is obtained are diluted using Aqua DM until the volume 50 mL. The concentration Au is analyzed by AAS (Atomic Absorption Spectrophotometer). In the precipitation process NaHSO3 and H2C2O4 were applied in order to get Au solid. Result Au content of VGA is 76.2 ppm. For 5 gram amount of sample is obtained 1.07 grams Au solid using NaHSO3 as a precipitant.Keywords: Au, Computer VGA, leaching, precipitant,
Kinetika Reaksi Demineralisasi Pada Isolasi Kitin Dari Limbah Ebi Yesi Afriani; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Chitin is a biopolymer, used for various fields like cosmetics, biomedical, porous material, absorbent of heavy metal, and dietary. The synthesized of chitin from ebi’s waste by deproteinization and demineralization process was investigated. The aims of this research is to determine the reaction kinetics of demineralization at isolation of chitin with variables of concentration of HCl and stirring rate. The research was started by mixing ebi’s waste powder with HCl concentration of 0,2 N; 0,6 N; 1 N; 1,4 N; and 1,8 N at temperature 29°C and the stirring rate 50, 100, 150, 200, and 250 rpm in the beaker glass and completely with stirrer. The Samples were taken for 15, 25, 35, 45 and 60 minutes in amount 20 mL, then washed until neutral and filtered by a filter paper. Isolated chitin was destructed by H2SO4 and HNO3 to determine calcium carbonate content by titration of complexometry. The results show that reaction kinetic follows pseudo second order equation. Reaction rate constant increases with increasing concentration. The reaction rate in the concentration 0,2 N; 0,6 N; 1 N; 1,4 N; and 1,8 N and stirring rate 150 rpm increased from 0,003 to 0,404 min-1. But stirring rate undefined by approaching of kinetics homogenous reaction. The Range of reaction rate constant is 0,00167- 0,394 min-1.Keywords : biopolymer, chitin, demineralization, ebi’s waste, reaction kinetic.
Pengendalian Laju Korosi Baja Dalam Air Laut Dengan Menggunakan Proteksi Katodik Metoda Anoda Korban Ayu Annisya Tri Adriana; Komalasari Komalasari; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Cathodic protection is a metal surface protection system against corrosion by direct current (DC ) from an external source to protect metal surfaces from corrosion. In this study, which the protection was employed of voltaic series sacrificial anode method, where the metal has a lower potential is used as sacrificial anodes in order to controlling carbon steel of corrosion. This research was conducted by using ASTM A36 steel in Bengkalis seawater with immersion lengths of 15, 20 and 25 days by using sacrificial anode of Al. The purpose of this research was to study the effect of cathodic protection in controlling the corrosion rate of carbon steel, determine the effectiveness of the sacrificial anode, and determine the best distance from the anode to the cathode. The design of the study was done by varying the type of anode in the form of Al , the anode to cathode distance 1 cm, 2 cm, 3 cm. Data was processed by using weight loss method with unit (mpy). The best protection occured at 15 days immersion, by using Al anode, the lowest corrosion rate is 1.448 mpy. In this study, the anode Al proved efective to protected carbon steel at a distance of 1 cm, and with an effectiveness of 69.06%.Key words: cathodic protection, corrosion rate, seawater, sacrificial anode
Penyerapan Logam Fe Dengan Menggunakan Karbon Aktif Dari AmpasTebu Yang Diaktifasi Dengan KOH Roni Roni; Drastinawati Drastinawati; Chairul Chairul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Bagasse is one of the agricultural or industrial waste that has potential for an adsorbent. Adsorbents produced from bagasse is processed by the pyrolys process. This study aimed to examine the effect of activated carbon absorption of ferrous metals with concentrations variations of KOH and adsorptiontime, and to study the characteristics of the activated carbon produced, among others, ash content and moisture content. This research was conducted in three phases, namely the preparation of raw materials, the manufacture of activated carbon, and the absorption of Fe in FeSO4 solution. Variations in the concentration of KOH used in this study were 0%, 5%, 10%, and 15%. As for the time variation adsorbs used were 30, 60, and 90 minutes. Percent absorption is the best obtained when the concentration of 15% KOH and adsorbs time of 90 minutes is equal to47%.Keywords: adsorbent, adsorption time, bagasse, KOH concentration.
Pengaruh Konsentrasi Asam Asetat Dan Waktu Perendaman Dalam Proses Biosizing Terhadap Karakteristik Serat Daun Nanas Sebagai Bahan Baku Pembuatan Benang Jaring Ikan Onil Andika; Idral Amri; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Pineapple leaf fiber is a natural fiber materials that has potential as the tool of fishing gear. However, natural fibers has the weakness, such as the low of breaking strength and prone to decayed. Therefore, it is necessary to used biosizing process for solving this problem. One of the biosizing agent that can be used is chitosan. The aims of this research is to know the effect of acetic acid concentration and soaking time on biosizing process against the breaking strength, elongation, water absorption, and density of the yarn fiber pineapple leaves. The variable process in this research is the concentration of acetic acid 2%, 4% and 6%, and biosizing time 20, 40, and 60 minutes. The study was conducted over several stages, like synthesis of chitosan from the crab shell, spinning the fiber into yarn, and the biosizing process. Biosizing yarn has mechanical and physical properties greater than natural fibers. The best results in this study is the treatment with 2% acetic acid concentration with soaking time of the yarn for 60 minutes with a breaking strength is 7.21 kgf/mm2, 28% elongation, 220% water absorption, and the density is 0.463 gr/cm3 . Based on FAO, pineapple leaf fiber yarn meet the standard as a fishing gear material, because it has a greater breaking strength than polyamide and polyetylene. Keywords: biosizing, breaking strength, chitosan, elongation, pineapple leaf fiber.
Pemanfaatan Limbah Abu Terbang (Fly Ash) Batu Bara Sebagai Bahan Campuran Beton Geopolimer Julharmito Julharmito; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Fly ash can be used in the manufacture of concrete geopolimer. The replacement of the use of cement with fly ash can reduce the cost of manufacture of concrete and can reduce global warming posed from the production of cement. This research aims to know the influence of the use of fly ash, variations in concentrations of KOH and Na2SiO3/KOH ratio relationships against the concrete compressive strength of concrete geopolimer and test the level of immobilisasi of heavy metals contained in concrete geopolimer. Geopolimer synthesized from fly ash using a mixed solution of KOH and Na2SiO3. The solution is prepared the day before use. Initially prepared a solution of KOH with concentrations of 8 M, 10 M, 12 M, 15 M and Na2SiO3/KOH ratio 0.8; 1.2; 1.6; 2.0. These materials are mixed while stirring and inserted into the mold cylinder diameter 4 cm height 8 cm. Batter the already hardened issued and in the dry at a temperature of 80оC for 24 hours, then the samples were dried at room temperature for 21 days, then performed a test of strong press, porosity and heavy metal content. Test result showed a strong increase with added press Molarity KOH and Na2SiO3/KOH ratio, strongly press the highest 30.26 MPa produced on the molar ratio of 14 m and Na2SiO3 KOH/KOH 2.0. Instead, the porosity obtained decreased with increasing molar NaOH and KOH Na2SiO3/ratio. The lowest porosity 6.49% obtained in Molarity KOH 14 and Na2SiO3/KOH ratio is 2.0. Concrete geopolimer able to immobilize heavy metals found in the fly ash with either. Metal Pb reduced from 8,954 mg/L be 0.66 mg/L, the metal Cr reduced from 6,978 mg/L be 2.096 mg/L, Cu Metal reduced from 12.355 mg/L be 7.350 mg/l. so as to meet the Government Regulation Number 101 by 2014.Key word: geopolimer concrete, fly ash, activator solution
Pemisahan Emas Pada Ram (Random Access Memory) Komputer : Pengaruh Variasi Rasio Jumlah Sampel : Volume Pelarut HNO3 Dan Jenis Presipitan Restika Rahayu; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Gold metal has been using in electronics and telecommunication industry, for example, computer RAM . The separation of gold from the computer's RAM has been done in this study. To get the maximum results in the separation of the gold used variations in the ratio of the number of samples : HNO3 solvent volume ( w/v 1:3 ; 1:6 ; 1:9 ) and the type of precipitant ( NaHSO3 and H2C2O4 ) . In this study, a certain number of samples is used computer RAM with a size of 1-3 mm then it is been leaching with HNO3 at a temperature of 70˚C for 1 hour. The precipitate formed is separated from the filtrate. The precipitate was dissolved in Aqua Regia at a temperature of 70˚C for 30 minutes further diluted with Aqua DM until the volume is 50 mL . Au concentration was analyzed by AAS Atomic Absorption Spectrophotometry and Au deposited with NaHSO3 and H2C2O4 . Based on the analysis result, the maximum Au concentration at the former computer RAM is equal to 54.95 ppm. For 5 grams of the sample , the maximum weight of Au precipitate obtained 0.72 grams by using H2C2O4 as a precipitant .Keyword : Au, RAM computer, Leaching, Precipitant
Isolasi Kitin Dari Limbah Cangkang Kepiting (Scylla SP) Dengan Variasi Pelarut Pada Proses Bleaching Frederika Mawarni Adilasari Nduru; Drastinawati Drastinawati; Silvia Reni Yenti
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

Crab shell is a waste that reach 50-60% of total weight, with chitin content of 20-30%. Chitin is biopolymer commercially used in biochemistry, medicine, textile, agriculture and others. The main aim of this research is to compare the level of lightness and whiteness of chitin produced in the bleaching process with organic and inorganic solvents. The research was started by reducing the size of the crab shell into a powder. Chitin was isolated by deproteination process using 3.5% NaOH and demineralization process using HCl 1N, followed by bleaching process with organic solvents variation of methanol; ethanol; acetone; ethanol:acetone (1:1), inorganic solvents of NaOCl 4%; Ca(OCl)2 3%; H2O2 3%, and the combination of acetone fallowed by NaOCl 0.315%. The result obtained is chitin without bleaching process with a yield of 24.44%, water content of 4%, and ash content of 1.75%. The IR spectrum analyzed before and after bleaching process showed relativity similiar absorption and were not affected by the solvent used in bleaching process. The color of chitin was analyzed using colorimeter. The result is the use of acetone fallowed by NaOCl 0.315% yileding chitin with 100% lighteness, 99.95% whiteness and categorized as white.Keywords: bleaching, crab shell, chitin, lightness, and whiteness.
Co-Authors Ahmad Fadli Aisyah Rani Alfarisi, Cory Dian Ayu Annisya Tri Adriana Bima Wandika Putra Chairul Chairul Desi Heltina Edo Prima Arif Esti Rahmat Tini Frederika Mawarni Adilasari Nduru Harfiah Faradila Idral Amri Ika Karina Jhon Alperdo Julharmito Julharmito Juliani Dafis Komalasari Komalasari Mery Sukmiwati Muhammad Nur Rahim Sjam Mutamima, Anisa Nurfatihayati Ongky Alexander Onil Andika Padil Padil Reny Nur Hidayah Restika Rahayu Ricson Rinaldi Rida Sari Juli Anti Roni Roni Rusma Yanti Silvia Reni Yenti Subkhan Maulana Wasty Rusjaya Wiriyan Jordy Wisrayetti Wisrayetti Wyda N Saragi Yelmida Azis Yesi Afriani Yusnimar Sahan