Garuda - Garba Rujukan Digital

Kinetika Leaching Ni dan Fe dari Bijih Laterit Tipe Limonite Morowali Gyan Prameswara; Flaviana Yohanala Prista Tyassena; Monita Pasaribu; Indhyca Novitha Febryanzha
REACTOR: Journal of Research on Chemistry and Engineering Vol 3, No 2 (2022): Published in December 2022
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v3i2.57

Nickel (Ni) deposits are depleting, while demand for the metal is increasing. To address this problem, valuable metals such as Ni and Fe can be extracted from secondary sources such as limonite-type laterite ores. The goal of this study was to investigate the influence of leaching temperature on Ni and Fe recovery, as well as the best kinetic model to represent the leaching process of these metals. Temperature has a considerable impact on the leaching process of Ni and Fe. Increasing the temperature from 30 to 90 oC can increase the recovery of Ni by 50% and Fe by 70 %. Ni and Fe recoveries were highest at 93.21 % and 95 %, respectively. Kinetic analysis of the two metals' leaching processes was also performed. It was discovered that the diffusion process controls Ni leaching, which can be represented using the Zhuravlev kinetic model, whereas chemical reactions on the surface of the unreacted core controls Fe leaching. The activation energies for leaching Ni and Fe are 36.53 and 40.32 kJ/mol, respectively. 1930 exp ((-36.53 kJ/mol)/(R.T))t=[(1-X)-1/3)-1]2 is the kinetic equation for Ni leaching. The kinetic equation for Fe leaching is 3903 exp ((- 40.32 kJ/mol)/(R.T)t=1-(1-X)1/3.

Growth Kinetic Study of Blue-green Microalgae Arthrospira platensis Using Buffalo Manure as Alternative Media BRIAN SINAGA; Lianty Simangunsong; Andy Trirakhmadi; Monita Pasaribu; Merry Martgrita
Microbiology Indonesia Vol. 14 No. 4 (2020): December 2020
Publisher : Indonesian Society for microbiology

North Sumatera is one of the provinces in Indonesia with the highest buffalo population, which is responsible for the high accumulation of buffalo manure that can cause environmental and aesthetic problems if left untreated. One of the possible alternatives for solving this issue is by implementing buffalo manure as growth media for microorganisms, e.g. microalgae. In this research, buffalo manure was used as alternative media for Arthospira platensis cultivation. Buffalo manure was taken from Sitoluama village, Laguboti, Toba Regency of North Sumatra Province. Research steps included media and culture preparation, cultivation, sampling, sample analysis and verification of constructed models and validation. Buffalo manure concentration in media is varied from 1 g.L-1 to 8 g.L-1 which is analogous to nitrogen content of 0.002 mg.L-1 to 0.018 mg.L-1. Growth data was used for growth kinetic modelling, which was most satisfactory for Monod model (Âµmax = 0.5915 day-1, Ks = 0.421 g.L-1). Â

Analisis Performa Heat Exchanger Shell And Tube pada Aliran Co-Current dan Counter-Current Iqbal, Muhammad Nasyarudin; Pasaribu, Monita; Nury, Dennis Farina; Luthfi, Muhammad Zulfikar; Safitri, Nurul Ulfa; Naufal, Hafidz; Handoko, Yohanes Tri; Chrystover, Endrigo; Fahlovi, Oldy
Majalah Teknik Industri Vol 32 No 2 (2024): Majalah Teknik Industri
Publisher : Unit Penelitian dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar

Energi panas atau kalor adalah energi yang dapat berpindah akibat adanya perbedaan suhu. Heat exchanger adalah alat yang memindahkan energi panas antara dua cairan melalui perbedaan suhu. Penukar panas shell-and-tube adalah salah satu penukar panas dan yang paling umum digunakan di kilang minyak dan proses kimia besar, dan sangat ideal untuk aplikasi bertekanan tinggi. Tujuan dari penelitian ini adalah menganalisis performa alat penukar panas WL 110.03 shell and tube dengan melihat perbedaan suhu rata-rata dalam ritme logaritmik (∆TLMTD), nilai perpindahan panas (Q), nilai panas yang hilang ke lingkungan (Qloss) dan efektivitas alat penukar panas (ε) menggunakan variasi aliran searah dan berlawanan. Hasil penelitian ini yaitu didapatkan efektivitas tertinggi terjadi pada arah aliran counter current dengan rata-rata sebesar 58,8% dan nilai perpindahan panas (U) sebesar -0,959 kw m² °C dibandingan dengan arah aliran co-current dengan rata-rata sebesar 30,30% dan nilai perpindahan panas (U) sebesar -0,919 kw m² °C. Semakin cepat kecepatan aliran cairan panas dan dingin, semakin besar koefisien perpindahan panas secara keseluruhan. Penelitian ini diharapkan dapat mengoptimalkan desain dan operasi penukar panas shell-and-tube untuk meningkatkan efisiensi termal dan mengurangi kehilangan panas, serta mengembangkan aplikasi dalam skala industri yang lebih luas dengan mempertimbangkan variasi kondisi operasi dan material yang lebih beragam.

Pengelolaan Sampah Plastik Dengan Mesin Pencacah di Infrastruktur Industri Pengolahan Sampah Terpadu Asari Rahayu, Puji; Tutuka, Rachmadi; Pasaribu, Monita; Jerry, Jerry; Ikhsandy, Ferry; Luthfi, Muhammad Zulfikar; Betariani, Khairunisa; Nury, Dennis Farina; Zulkipli, Rohiman Ahmad; Nugroho , Muhammad Erwin Cahyo
PATRIOTIKA: Jurnal Inovasi dan Pemberdayaan Masyarakat Vol 1 No 1 (2025): May 2025
Publisher : Universitas Nahdlatul Ulama Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar

The increasing problem of plastic waste has become one of the biggest environmental challenges in the world today. To overcome this problem, the development of plastic shredding technology is an effective solution to support the plastic recycling process. This study aims to design and develop an efficient and environmentally friendly plastic waste shredding machine, which is able to reduce the volume of plastic waste and facilitate the recycling process. The research methodology includes identifying user needs, literature studies, developing design concepts, detailed design using software, prototyping, and testing and evaluating machine performance. The designed shredding machine has a shredding capacity of 50 kg/hour with lower energy consumption compared to existing commercial shredding machines. Consistent machine testing in producing plastic flakes with uniform sizes, which are suitable for further recycling processes. Performance analysis relates to machines that are able to process various types of plastic, including PET, HDPE, and PP, with high shredding efficiency. The developed plastic shredding machine is able to provide a practical solution for plastic waste management by optimizing the recycling process and reducing negative impacts on the environment. The development of this plastic shredding machine is expected to contribute significantly to efforts to reduce plastic waste and support environmental sustainability.

Produksi Briket dari Limbah Plastik dan Ampas Tebu dengan Metode Pirolisis Pasaribu, Monita; Sena, Muhammad Arya; Kristiani , Maria; Jaman, Winda Sri; Enggita, Asadian Puja; Supardi, Supardi
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 10 No. 2 (2024): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v10i2.599

Plastic is a polymer product that is widely used in society. This resultx in an increase in plastic waste. Plastic waste processing needs to be done to prevent environmental emissions. Plasstic waste can be converted into an alternative energy source in briquettes. The reasearch object is to produce briquettes from plastic and sugarcane bagasse. Plastic briquettes and bagasse have a ratio of 1:2, 1:1 and 2:1. The second stage is the preparation and design of the tool using the pyrolisis method. Research variables include the composition of plastic waste and sugarcane bagasse. Analysis of briquette products includes calorific value, ash conten and water conten. The results of research on briquette products with variations in sampel A having a ratio of 1:2, sample B with ratio of 1:1 and sample C with a ratio 2:1 respectively show a calorific value of 3,929 cal/g, 4.013 cal/g, 4,222 cal/g; water content values of 8,6%, 6,7%, 5,8%, the ash content value is 5,4%, 7,2% and 8,6% and the volatile matter value is 15.3, 13.2% and 12,6%.

Kinetika Leaching Ni dan Fe dari Bijih Laterit Tipe Limonite Morowali Prameswara, Gyan; Tyassena, Flaviana Yohanala Prista; Pasaribu, Monita; Febryanzha , Indhyca Novitha
REACTOR: Journal of Research on Chemistry and Engineering Vol. 3 No. 2 (2022)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v3i2.57

Nickel (Ni) deposits are depleting, while demand for the metal is increasing. To address this problem, valuable metals such as Ni and Fe can be extracted from secondary sources such as limonite-type laterite ores. The goal of this study was to investigate the influence of leaching temperature on Ni and Fe recovery, as well as the best kinetic model to represent the leaching process of these metals. Temperature has a considerable impact on the leaching process of Ni and Fe. Increasing the temperature from 30 to 90 oC can increase the recovery of Ni by 50% and Fe by 70 %. Ni and Fe recoveries were highest at 93.21 % and 95 %, respectively. Kinetic analysis of the two metals' leaching processes was also performed. It was discovered that the diffusion process controls Ni leaching, which can be represented using the Zhuravlev kinetic model, whereas chemical reactions on the surface of the unreacted core controls Fe leaching. The activation energies for leaching Ni and Fe are 36.53 and 40.32 kJ/mol, respectively. 1930 exp ((-36.53 kJ/mol)/(R.T))t=[(1-X)-1/3)-1]2 is the kinetic equation for Ni leaching. The kinetic equation for Fe leaching is 3903 exp ((- 40.32 kJ/mol)/(R.T)t=1-(1 X)1/3.

Title

Found 6 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 6 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 6 Documents
Search