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- Darmadi
Department Of Chemical Engineering, Faculty Of Engineering, Universitas Syiah Kuala, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences

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Pengolahan Limbah Cair Pabrik Pupuk Urea Menggunakan Advanced Oxidation Processes Darmadi, Darmadi
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 1 (2014): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v10i1.2166

Abstract

Limbah cair pabrik pupuk urea terdiri dari urea dan amonium yang masing-masing mempunyai konsentrasi berkisar antara 1500-10000 ppm dan 400-3000 ppm. Konsentrasi urea yang tinggi di dalam badan air dapat menyebabkan blooming algae dalam ekosistem tersebut yang dapat mengakibatkan kehidupan biota air lain terserang penyakit. Peristiwa ini terjadi karena kurangnya nutrisi bagi biota air dan sedikitnya sinar matahari yang dapat menembusi permukaan air. Disamping kedua hal tersebut di atas, algae juga dapat memproduksi senyawa beracun bagi biota air dan manusia. Penelitian ini bertujuan untuk mengolah urea menggunakan oksidasi konvensional (H2O2) dan Advanced Oxidation Processes (kombinasi H2O2-Fe2+) pada pH 5 dengan parameter yang digunakan adalah variasi konsen-trasi awal H2O2 dan konsentrasi Fe2+. Hasil percobaan menunjukkan bahwa penurunan konsentrasi urea tertinggi diperoleh pada penggunaan reagen fenton (8000 ppm H2O2 dan 500 ppm Fe2+), yaitu dapat menurunkan urea dari konsentrasi awal urea 2566,145 ppm menjadi 0 ppm. Kinetika reaksi dekomposisi urea menjadi amonium dan amonium menjadi nitrit dan nitrat yang diuji mengikuti laju kinetika reaksi orde 1 (satu) terhadap urea dan orde satu terhadap amonium dengan konstanta laju reaksi masing-masing k1 = 0,019 dan k2 = 0,022 min-1.
Linear Driving Force Model for Adsorption onto Activated Carbon Monolith Darmadi, Darmadi; Choong, Thomas S.Y.; Chuah, T. G.; Yunus, Robiah; Yap, Taufiq Y.H.
Jurnal Rekayasa Kimia & Lingkungan Vol 5, No 1 (2006): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

A mathematical model on carbon coated monolith using the linear driving force model is develop. The computer program is writted in MATLAB and simulation using data from [4] for cell density 200 cpsi was used to studies the effect of different variables on breakthrough profiles. The result showed that the breakthrough curve of the monolith is very sharp. Because of its an open structure and lower pressure drop, monolith is an attractive alternative internals for separation.Keywords: Adsorption, modeling, simulation, carbon coated monolith, breakthrough
Pengolahan Limbah Cair Laundry Menggunakan Membran Selulosa Diasetat Berbasis Selulosa Pulp Kayu Sengon (Paraserianthes falcataria) Setiawan, Vera Roni; Rosnelly, Cut Meurah; Darmadi, Darmadi
Jurnal Rekayasa Kimia & Lingkungan Vol 9, No 3 (2013): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v9i3.782

Abstract

The improvement of laundry activity brought a negative effect on the environment because laundry wastewater have a high content pollutants such as phosphate, surfactants, mineral, nitrogen, COD and other components, so the treatment is needed before being discharged into terristorial water. Laundry wastewater treatment has been conducted by membrane technology. Preparation of cellulose diacetate membranes with ultrafiltration process had be done by phase inversion using dimethylformamide (DMF) as a solvent. The filtration experiment showed that the highest membrane flux was 77,408 L/m2.h at TMP 3 bar. While the lowest flux at TMP 1 bar was 55.649 L/m2.h. Rejection of membrane ultrafiltration for parameters of COD, phosphate, and surfactant were 67%, 72%, and 63% respectively.Keywords: cellulose diacetate membranes, laundry wastewater, flux, rejection
Adsorption of Anion Dye from Aqueous Solution by Activated Carbon Coated Monolith in a Batch System Darmadi, Darmadi; Thaib, Anwar
Jurnal Rekayasa Kimia & Lingkungan Vol 7, No 4 (2010): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

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Abstract

The adsorption of an anion dye, methyl orange, from aqueous solutions on polymer based carbon coated monolith was studied in a batch system. The kinetics of adsorption with respect to the initial dye concentration was investigated. Langmuir and Freundlich isotherms were applied to describe the experimental data. Equilibrium data fitted well to the Freundlich model for concentration range (0 160 mg/L). The maximum adsorption capacity of the carbon with BET surface area of 431 m2/g obtained from the Freundlich model was 36.72 (mg/g) (L/mg)1/n. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic data. The experimental data fitted well to the pseudo-second-order kinetic model with constant rates 5.42x10-4 and 2.22x10-4 g/(min-mg) for initial concentrations 50 and 100 mg/L, respectively. Keywords: adsorption, anion dye, carbon coated monolith
Removal of Lead Ion (Pb2+) in Water Using Modified Clay-Carbon-Manganese Monolith: Characterization and Adsorption Studies Hafni Putri Indriani Indra; Darmadi Darmadi; Adisalamun Adisalamun; Aula Chairunnisak; Nasrullah RCL
Elkawnie Vol. 9 No. 2 (2023)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v9i2.16976

Abstract

Abstract:  In recent years, the presence of heavy metals in water has been a concern, and some purification processes have been developed to overcome these problems. This study aims to conduct and investigate the performance of the 3 modifications of adsorbents namely clay-carbon, clay-carbon manganese monolith 2% and clay-carbon manganese monolith 5% in adsorbing Pb2+ ions in water. The surfaces and elemental compositions of the two adsorbents were investigated by a scanning electron microscope and Fourier infrared transform. The variables evaluated in analyzing the adsorption efficiencies were the effect of contact time (0, 150, 180, 210, and 240 minutes), MnO2 doses in monolith (2 and 5% weight) and initial Pb2+ ion concentrations (2 and 4 mg/L). The adsorption behaviour in the equilibrium stage was observed through the isotherms (Freundlich, Langmuir, and Brunauer–Emmett–Teller (BET)) and kinetics study (pseudo-first and pseudo-second order linear-non linear models). The impregnation of manganese into the adsorbent showed significant results in adsorption. The maximum adsorption efficiency was 92.92% in a Pb2+ solution of 4 mg/L utilizing clay-carbon-manganese monolith at a contact time of 240 minutes. Meanwhile, the clay-carbon monolith efficiency was 50.59%. Thus, the modification biomass material with the impregnation of metal such as clay-carbon-manganese monolith can be used as a potent, reusable, and durable adsorbent in removing metal ions in water and wastewater.Abstrak: Dalam beberapa tahun terakhir, keberadaan logam berat dalam air masih menjadi perhatian dan beberapa proses pemurnian dikembangkan untuk mengatasi masalah ini. Adsorpsi adalah proses yang efisien dan murah untuk mengolah air yang mengandung logam berat. Penelitian ini bertujuan untuk melakukan dan menyelidiki kinerja monolit tanah liat-karbon dan tanah liat-karbon mangan dalam mengadsorpsi ion Pb2+ dalam air. Permukaan dan komposisi unsur dari dua adsorben diselidiki dengan mikroskop elektron dan transformasi inframerah fourier. Variabel yang dinilai dalam analisis efisiensi adsorpsi adalah pengaruh waktu kontak (0, 150, 180, 210 dan 240 menit), dosis MnO2 dalam monolit (2 dan 5% berat) dan konsentrasi ion Pb2+ awal (2 dan 4 mg/L). ). Perilaku adsorpsi pada tahap kesetimbangan diamati melalui isoterm (Freundlich, Langmuir dan Brunauer–Emmett–Teller (BET)) dan studi kinetika (model linier-non linier orde satu semu dan semu dua). Impregnasi mangan ke dalam adsorben menunjukkan hasil yang signifikan dalam adsorpsi. Efisiensi adsorpsi ion Pb2+ tertinggi diperoleh 92,92% pada konsentrasi larutan 4 mg/L dengan penggunaan monolit lempung-karbon-mangan pada waktu kontak 240 menit. Sedangkan efisiensi clay-carbon monolit sebesar 50,59%. Perilaku adsorpsi ion Pb2+ baik pada karbon lempung maupun monolit karbon-lempung-mangan paling sesuai dengan model orde satu non linier dan isoterm Langmuir, dimana adsorpsi terjadi pada permukaan adsorben monolayer. Dengan demikian, bahan biomassa modifikasi dengan impregnasi logam seperti monolit tanah liat-karbon-mangan dapat digunakan sebagai adsorben yang kuat, dapat digunakan kembali, dan tahan lama dalam menghilangkan ion logam dalam air dan air limbah.
Optimization of Sea Transportation Services in The Kepulauan Seribu Using The Vehicle Routing Problem (VRP) Model Darmadi, Darmadi; Soehodho, Sutanto; Nahry, Nahry
Smart City
Publisher : UI Scholars Hub

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Abstract

The Kepulauan Seribu regency relies heavily on sea transportation for passenger mobility and goods distribution. However, current systems face efficiency challenges, high operational costs, and potential imbalances between demand and service capacity. This study proposes a framework to optimize sea transportation services in the Kepulauan Seribu using the Vehicle Routing Problem (VRP) method, especially the Capacitated Vehicle Routing Problem – Many Single Depot (CVRP–MSD) model with heterogeneous fleets and mixed cargo (passenger and goods). The main objective is to minimize total operating costs, which include fixed costs of using the vessel and variable travel costs, and unmet demand, both passenger and goods. The model was formulated to determine the ideal number of ships to operate, design the most efficient shipping routes that connect depots in Jakarta with destination islands, address capacity limitations for passenger and goods transport, and minimize unmet demand. Analysis based on analogue studies shows that the application of the VRP model has the potential to significantly reduce transportation costs, increase fleet utilization, and provide quantitative data on service capacity shortages, thus allowing for better planning to meet the entire demand.
Co-Authors - Jalaluddin Abrar Muslim Adisalamun Adisalamun Adisalamun Adisalamun Adisalamun Adisalamun Adisalamun Adisalamun Adisalamun Adisalamun Anwar Thaib Anwar Thaib Asri Gani Aula Chairunnisak Aula Chairunnisak Aula Chairunnisak Aula Chairunnisak Azhari Azhari Bastian Arifin Chuah T.G Cut Meurah Rosnelly Dahnilsyah, Dahnilsyah Debby Widya Kusuma Dzikri Hamzah Eti Indarti Farid Nanda Gontar Alamsyah Siregar Hafni Putri Indriani Indra Hery Widijanto Hesti Meilina Hesti Meilina Hisbullah Hisbullah Hizir Hizir Husni Husin Husni Husin, M.T. Ibrahim, Ishak - Ishak Ishak Kamaruzzaman, Suraiya Kusuma, Debby Widya Kusuma, Laila Laila Kusuma Leonardo Basa Dairi M, Iqhramullah M, Irfan M. Yogi Riyantama Isjoni Mahidin Mahidin Mahidin Mahidin Marwan Marwan Medyan Riza Mirna Lubis Mirna Rahmah Lubis Mitri Irianti Muhammad - Muhammad Muhammad Dani Supardan Muhammad Syam, Azhari - Muhammad Zaki Muhammad Zaki Muhammad Zaki Muhammad, Muhammad - Mukramah Yusuf Muslim*, Abrar Nahry Nahry Nasrullah RCL Nurfarida - Nurfarida Nurfarida, Nurfarida - Nurhazanah Nurhazanah Nurhazanah, Nurhazanah Opie Azza Shafira Pocut Nurul Alam Rasdiansyah Rasdiansyah Rivalino, Ricky Robiah Yunus Robiah Yunus Robiah Yunus Ruka Yulia Saiful Saiful Saiful Saiful Siti Sarah Siti Sarah, Siti Suraiya Kamaruzzaman Sutanto Soehodho Syawaliah Mukhtar T. G. Chuah T. G. Chuah Taufik Rinaldi Taufiq Y.H. Yap Taufiq Y.H. Yap Thomas S.Y Choong Thomas S.Y. Choong Thomas S.Y. Choong Ulfa Rijal Safitri Vera Roni Setiawan Vera Roni Setiawan Wahyu Rinaldi Y.H. Taufiq Yap Yulia, Ruka Yustina Yustina