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Slamet Sumardi, Slamet
UPT Balai Pengolahan Mineral Lampung, LIPI Jln. Ir. Sutami Km. 15 Tanjung Bintang, Lampung Selatan, 35364
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Electrocoagulation in Wastewater from Spent-Batteries Recycling Mufakhir, Fika Rofiek; Khotimah, Chusnul; Oediyani, Soesaptri; Astuti, Widi; Sumardi, Slamet; Prasetia, Hendra; Arham, La Ode; Hakim, Hafid Zul; Petrus, Himawan Tri Bayu Murti; Poernomo, Venny
Indonesian Journal of Chemistry Vol 24, No 4 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93262

Abstract

This study uses electrocoagulation to investigate reducing heavy metal content in wastewater from discharging spent batteries. ICP-OES analysis shows that heavy metals exceed the environmental water standard. The electrocoagulation procedure was conducted within a reactor with a 500 mL volume and a rectifier with a 5 A current capacity. Three types of electrode material combinations were used: iron (Fe) and aluminium (Al) as well as Fe-Fe, Al-Al, and Fe-Al pairs with 1 cm in the distance by parallel monopolar cells. Alternating current was used with 30, 40, and 50 A/m2 current density. The best result shown in the Fe-Al electrode pair combination system at 40 A/m2 for 30 min contact time and removal efficiencies for Co, Cd, Ni, Zn, and As is 98.76, 90.73, 99.32, 97.93, and 97.78%, respectively, while for Hg it is 31.84%, even though only Cd is above the standard limit. The heavy metal bearing was confirmed using SEM-EDS in the floc and the precipitate residue. The dissolved electrode materials and electrical energy consumed are 0.32 g and 0.109 kWh/m3, respectively. This method can be a good alternative for treating wastewater compared to direct current electrocoagulation, where the electrode and energy will be less consumed.
Nickel recovery from nickel-containing spent catalyst using atmospheric leaching and oxalate precipitation Widi Astuti; Yuniati, Mutia Dewi; Yuda, Aulia Pertiwi Tri; Sumardi, Slamet; Dewi, Jilda Sofiana; Wanta, Kevin Cleary; Petrus, Himawan Tri Bayu Murti
Jurnal Rekayasa Proses Vol 0 No 0.1 (3000): ONLINE FIRST
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.17589

Abstract

A study has been done to investigate and optimize the recovery of nickel from nickel-containing spent catalyst through sulfuric acid (1 - 2 mol/L) atmospheric leaching in different operation conditions. From the leaching experiments, it was possible to extract 77.95% nickel under the conditions of 2 mol/L H2SO4, reaction time of 5 h, 5% pulp density, and temperature of 80°C. In the next step Ni was selectively precipitated from a sulfuric acid-leached solution using 1 mol/L oxalic acid. The nickel content in the product was 97.29% Ni. Based on the study, sulfuric acid was found to be a suitable leaching agent to extract Ni from the nickel-containing spent catalyst. The study also indicated the effective extraction and recovery of nickel which was well supported by characterization studies using XRD technique.
Extraction of manganese from Indonesian manganese ore using sugarcane bagasse-acid reductive leaching Widi Astuti; Pinania, Kherani Hana; Lesmana, Donny; Dewi, Jilda Sofiana; Supriyadi, Harry; Sumardi, Slamet; Prakosa, Agus
Jurnal Rekayasa Proses Vol 19 No 1 (2025): Volume 19, Number 1, 2025
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.17591

Abstract

In this study, sugarcane bagasse was used as a reducing agent in manganese leaching from manganese ore from Way Kanan, Lampung under acidic conditions using sulfuric acid as a leaching reagent. Bagasse is an agricultural waste from the cane sugar manufacturing industry which is commonly found in Lampung Province. This agricultural waste has the potential to become a reducing agent in manganese leaching because it contains carbon in the form of cellulose and sugar. The optimization of the leaching conditions has been investigated with the parameters of H2SO4 concentration, temperature, and pulp density. The highest manganese leaching recovery was obtained under the following optimized conditions: 1 M H2SO4 concentration, 14 g sugarcane bagasse/20 g MnO2, 50 g/L pulp density, 80 °C leaching temperature, 200 rpm stirring rate, and 4 hours of reaction time. The present process therefore deals with achieving the effective recovery of value-added products from low-grade manganese ore using agriculture waste as reducing agent.
Penentuan kondisi optimum pembuatan silica gel menggunakan silika geothermal dengan metode sol-gel Sujoto, Vincent Sutresno Hadi; Tangkas, I Wayan Christ Widhi Herman; Astuti, Widi; Sumardi, Slamet; Jenie, Siti Nurul Aisyiyah; Tampubolon, Aron Pangihutan Christian; Syamsumin, Syamsumin; Utama, Andhika Putera; Petrus, Himawan Tri Bayu Murti; Kusumastuti, Yuni
Jurnal Rekayasa Proses Vol 17 No 2 (2023): Volume 17, Number 2, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.77696

Abstract

Salah satu permasalahan yang muncul di lapangan pembangkit listrik panas bumi (PLTP) adalah terjadinya silica scaling dalam sistem pemipaaan akibat konsentrasi padatan terlarut yang tinggi pada air geotermal (geothermal brine). Silica scalling dapat menyebabkan penurunan efisiensi pembangkitan energi listrik dari panas bumi. Pada penelitian ini lumpur silika yang dihasilkan dari lapangan pembangkit listrik panas bumi akan dimanfaatkan sebagai raw material sintesis silica gel. Silica gel disintesis menggunakan metode sol-gel dengan variasi rasio natrium silikat dan air (1:3 ; 1:4 ; dan 1:5) dan konsentrasi asam klorida ( 0,5 M ; 1 M; dan 2 M). Karakteristik silica gel dilihat menggunakan analisis Forier Transform Infra Red (FTIR). Secara umum, pita serapan yang muncul pada spektra sample silica gel menunjukkan bahwa gugus fungsional yang terdapat pada silica gel adalah gugus silanol (Si-OH) dan gugus siloksan (Si-O-Si). Panjang gelombang 1055,86 cm-1­ menunjukkan gugus Si-O, yang mengindikasikan adanya vibrasi SiO4 dan polimerisasi Si-O-Si saat pembentukan silica gel. Selain itu, kapasitas penjerapan air oleh silika gel menunjukkan bahwa sampel dengan kode A7 memiliki kapasitas penjerapan air terbesar, yaitu mencapai 0,9331 gr air/ gram silica gel. Analisis Response Surface Methodology (RSM) mengindikasikan bahwa konsentrasi asam memberikan pengaruh singnifikan terhadap pembentukan silica gel dibandingkan dengan variasi pengenceran natrium silikat.
Pengaruh parameter operasi terhadap persentase rekoveri litium dari sea water reverse osmosis (SWRO) Anggara, Ferian; Sujoto, Vincent Sutresno Hadi; Astuti, Widi; Sumardi, Slamet; Putra, Ilham Satria Raditya; Putra, Agik Dwika; Petrus, Himawan Tri Bayu Murti
Jurnal Rekayasa Proses Vol 18 No 1 (2024): Volume 18, Number 1, 2024
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.79556

Abstract

Konsentrasi litium dalam sea water reverse osmosis (SWRO) terhitung masih kecil dibandingkan dengan sumber konvensional. Tren penggunaan air laut di dunia diperkirakan naik untuk tahun-tahun mendatang. Tujuan dari penelitian ini adalah untuk mengekstrak litium dari limbah cair SWRO. Bahan yang digunakan adalah limbah cair SWRO yang berasal dari PT. Cirebon Electric Power. Tahap awal yang perlu dilakukan adalah proses evaporasi. Proses evaporasi dilakukan pada temperatur 90°C. Proses evaporasi bertujuan untuk memekatkan atau mengkonsentrasikan mineral tertentu. Pada tahapan ini persentase penguapan divariasikan (70, 80, dan 90%). Proses presipitasi dilakukan dengan menggunakan bantuan natrium karbonat (Na2CO3). Tahap awal adalah pembuatan larutan Na2CO3 3 Molar. 250 mL larutan hasil evaporasi disiapkan dan dipanaskan pada berbagai variasi temperatur (70, 80, dan 90 °C). Analisa tersebut juga menunjukkan kecenderungan semakin meningkatnya persentase rekoveri yang sejalan dengan meningkatnya persentase penguapan. Meskipun dampaknya kecil, temperatur presipitasi juga memberikan dampak dalam proses persentase rekoveri litium. Kondisi terbaik di dalam penelitian ini adalah pada persentase penguapan 90% dengan temperatur presipitasi 90 °C dengan persentase rekoveri mencapai lebih dari 70%.
Pengaruh penambahan fly ash PLTU Cirebon dan temperatur pengeringan terhadap kuat tekan material konstruksi beton high volume fly ash (HFVA) Anggara, Ferian; Sujoto, Vincent Sutresno Hadi; Tangkas, I Wayan Christ Widhi Herman; Astuti, Widi; Sumardi, Slamet; Putra, Ilham Satria Raditya; Putra, Agik Dwika; Petrus, Himawan Tri Bayu Murti
Jurnal Rekayasa Proses Vol 17 No 2 (2023): Volume 17, Number 2, 2023
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.77825

Abstract

Penggunaaan batubara sebagai sumber energi di negara berkembang seperti Indonesia masih menjadi pilihan utama. Hasil samping pembakaran batubara di Pembangkit Listrik Tenaga Uap (PLTU) berupa fly ash dan bottom ash (FABA) akan terus meningkat seriring konsumsi bataubara sebagai energi meningkat. Industri semen dapat mengahsilkan 2,9 miliar ton CO2 ke atmosfer hal ini akan berdampak langsung terhadap kenaikan temperatur bumi dan pemansan global. Subtitusi material semen dengan fly ash menjadi sebuah pilihan yang ramah lingkungan dalam meminimalisir gas CO2. Pembuatan beton dimulai dengan mencampurkan fly ash dan semen pada berbagai rasio (1:1; 1:3 ; 1:4) dengan air. Air dituang secara bertahap sedikit demi sedikit sambil diaduk hingga membentuk pasta. Pasta beton yang telah terbentuk dicetak pada cetakan kubus ukuran 5x5x5 cm3. Cetakan pasta HVFA didiamkan selama 1 hari, kemudian dikeringkan (curing) pada temperatur yang divariasikan (30, 40 dan 60°C). Hasil Analisa oksida komponen kimia menunjukan bahwa fly ash dari PLTU Cirebon tergolong kategori fly ash kelas C dengan kadar CaO lebih dari 10% dan SiO2 kurang dari 46% dan Kekuatan beton (compressive strength) HVFA yang paling besar yang dapat dihasilkan beton HVFA adalah pada rasio komposisi semen dan fly ash 1:3 dengan temperatur pengeringan 40°C. material fly ash mampu menggantikan semen sebesar 75% dari kebutuhan beton HVFA dengan kekuatan beton mencapai 12,557 MPa pada kondisi pengeringan 40°C. Hasil optimasi menunjukan variable yang paling berpengaruh terhadap kuat tekan beton yang dihasilkan adalah temperatur pengeringan.
An extensive analysis and examination of techniques to enhance the efficiency of water extraction from wastewater generated during the recycling of nickel manganese cobalt (NMC) batteries using reverse osmosis membrane technology. Prasetya, Agus; Mulyono, Panut; Sujoto, Vincent Sutresno Hadi; Warmita, Helena Karunia; Perdana, Indra; Sutijan, Sutijan; Astuti, Widi; Sumardi, Slamet; Jenie, Siti Nurul Aisyiyah
Jurnal Rekayasa Proses Vol 18 No 1 (2024): Volume 18, Number 1, 2024
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.12711

Abstract

Industrial water consumption will account for 22% of global water demand by 2030. Industry water conservation is encouraged by rapid corporate growth. Industrial resource usage and pollutant emissions can be reduced via cleaner production methods. Recycling is essential to greener production and the circular economy. Recycling is crucial to achieving the 2030 Sustainable Development Goals. The electric vehicle (EV) sector has propelled battery business growth in recent years, especially in Indonesia. The electric vehicle (EV) sector will benefit from using Nickel Manganese Cobalt (NMC) batteries. The study will use reverse osmosis (RO) membrane filtration to recover water from recovered NMC battery effluent. The experiment will investigate feed solution concentrations, pressures (8, 10, and 12 bar), and temperatures (30, 40, and 50°C). Two factors—permeate flux and metal ion rejection—determine reverse osmosis membrane efficiency. Li and Na metal rejection was maximum at 30°C and 12 bar, with 94-96% and 90-93% rejection rates, respectively. Under certain operating conditions, reverse osmosis membrane technology significantly reduced sodium (Na) concentration in NMC battery recycling effluent. Thus, wastewater is no longer saline. Reverse osmosis water can be reused for cooling due to its Li and Na concentrations.
Heavy Metal Adsorption Using Cellulose Xanthate from Sugarcane Bagasse: A Fixed-Bed Column Study Iryani, Dewi Agustina; Permadi, Sigit; Astuti, Widi; Sumardi, Slamet; Taharuddin, Taharuddin
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.38058

Abstract

In recent years, various environmentally friendly adsorbents have been developed to address the removal of heavy metals from industrial wastewater. This study focuses on the adsorption of lead (Pb) and copper (Cu) using cellulose xanthate derived from sugarcane bagasse as an adsorbent. The adsorption experiments were conducted in a fixed-bed column with dimensions of 2.4 cm in diameter and 8 cm in height. Atomic Absorption Spectrophotometry (AAS) was used to analyze the concentrations of Pb and Cu before and after adsorption, while the adsorbent composition was characterized using X-Ray Fluorescence (XRF). The breakthrough times for Pb and Cu adsorption was found to be 8 and 6 minutes, respectively, with total adsorption durations of 18.584 and 17.543 minutes. The Thomas Model was employed to evaluate the kinetics and adsorption capacity, yielding kinetic constants (KTH) of 0.00283 and 0.0006 mL/mg.min for Pb and Cu, respectively, and adsorption capacities (qeq) of 712.89 and 181.18 mg/g. These results provide valuable insights into the adsorbents efficiency, kinetics, and potential applications in environmental remediation and wastewater treatment.
PENGARUH VARIASI TEMPERATUR PENCELUPAN TERHADAP SIFAT MEKANIK PADA BAJA KARBON RENDAH (0.02% C) DENGAN METODE PELAPISAN HOT DIP GALVANIZING R, Tumpal Ojahan; Sumardi, Slamet; Yoga, Dwi
Jurnal Rekayasa Teknologi dan sains Vol 1, No 1 (2017): Jurnal Rekayasa, Teknologi, dan Sains
Publisher : Fakultas Teknik Universitas Malahayati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jrets.v1i1.987

Abstract

Tujuan penelitian ini adalah mengetahui pengaruh temperatur pencelupan terhadap nilai kekerasan, nilai ketebalan lapisan, struktur mikro serta pengamatan SEM. Proses penelitian ini menggunakan metode pelapisan Hot Dip Galvanizing dengan variasi temperatur 420 oC, 440 oC, 460 oC, 480 oC serta waktu pencelupan selama 6 menit. Untuk mengetahui hasil penelitian diatas maka dilakukan beberapa pengujian yaitu uji komposisi kimia, uji kekerasan HRb, uji ketebalan lapisan, uji struktur mikro serta uji SEM. Hasil uji kekerasan tertinggi pada variasi temperatur 480 oC sebesar 76.51 HRb, hasil uji ketebalan lapisan tertinggi pada variasi temperatur 440 oC sebesar 200.09 μm dan hasil uji struktur mikro menunjukkan susunan struktur lapisan Zn dengan baja terbentuk Eta, Zeta, Delta dan Gamma. Pengamatan SEM terdapat unsur yang terkandung pada material yang dilapisi. Dari penelitian ini dapat disimpulkan bahwa variasi temperatur juga mempengaruhi hasil dari sifat mekanik.Kata kunci : baja karbon rendah, sifat mekanik, variasi temperatur pencelupan, hot dip galvanizing. ABSTRACT: The Immersion Temperature Variations Influence Of Mechanical Properties In Steel Low Carbon (0,02% C) With The Coating Hot Dip Galvanizing Method.The objective of the study was to identify the effect of temperature variation on dip process towards hardness index, layer thickness rate, micro structure and SEM observation. This study occupied Hot Dip Galvanizing with 420 oC, 440 oC, 460 oC, 480 oC temperature variations and 6 minutes dip process duration. To achieve the above objectives, some test were done, they are chemical composition, HRb Hardness test, layer thickness test, micro structure test and SEM test. The highest hardness test on 480 oC was 76.51 HRb, the thickest was on 440 oC temperature with 200.09 μ m, and the result of micro structure showed structural composition consisting of Eta, Zeta, Delta and Gamma. SEM observation revealed elements contained in coated material. This study concluded that temperature variation effected mechanica l properties.Keywords : low carbon steel, mechanical, dip temperature variation, hot dip galvanizing 
The Effect of Lime Stone in the Probability of Formation Pores Structures in Glass Ceramic Based on Scoria Basalt Rocks Birawidha, David Candra; Sumardi, Slamet; Oktaviando, Fany; Karo-Karo, Pulung; Isnugroho, Kusno; Hendronursito, Yusup; Amin, Muhammad
JST (Jurnal Sains dan Teknologi) Vol. 12 No. 2 (2023): July
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v12i2.44366

Abstract

This paper provides a Lightweight material is the result of technological problems in increasing the efficiency of finished products, saving manufacturing costs and environmentally friendly technology by reducing the amount of material used. There are many kinds of material manufacturing technology, ranging from the use of lightweight materials from the start, combining materials into composites and modifying the structure and characteristics of the material to make it lightweight. One commonly used method is to mix glass-ceramic with a foaming agent in purpose to modify the structure of material. The purpose of this study is to utillize basalt rock as source of glass ceramic and mixed with limestone to form cellular structure with optimal composition. The samples was crushed and sieve through 100 mesh afterward all material is mixed varied between basalt and lime with a ratio of sample A (100% Basalt), sample B (3:7), sample C (5:5), and sample D (7:3), which were burned at a temperature of 1100°C and 1300°C. After all sample reach designated temperature, all sample undergo annealed cooling in the furnace. Based on the characterization results, the best glass-ceramic sample formed with pores structure formation was sample B which is 70% addition of limestone in basalt mixture and burned at a temperature of 1100°C with a total pore size of 63% and a density of 0.92 g/cm3, where the glass-ceramic structure detected pyroxene and lime phases with a SiO2 composition of 14.61%. Basalt cellular ceramic is obtained in optimal condition with low density and higher percentage porosity.
Co-Authors Adythia, Dicky Marsa Agus Prasetya Arham, La Ode Birawidha, David Candra Chusnul Khotimah Clarasati, Frista Dewi Agustina Iryani, Dewi Agustina Dewi, Jilda Sofiana Donny Lesmana Ferian Anggara firdiyono, F Hafid Zul Hakim Himawan Tri Bayu Murti Petrus Indra Perdana Isnugroho, Kusno Jayawarsa, A.A. Ketut Kevin Cleary Wanta Marjunus, Roniyus Mohammad Zaki Mubarok, Mohammad Zaki Mufakhir, Fika Rofiek Mufakhir, Fika Rofiek Muhammad Amin Muttaqqi, Muhammad Al Natalia, Priskila Nuryadi Saleh, Nuryadi Oktaviando, Fany Panut Mulyono PERMADI, SIGIT Pinania, Kherani Hana Poernomo, Venny Prakosa, Agus Prasetyo, Agus Budi Pulung Karo-Karo Putra, Agik Dwika Putra, Ilham Satria Raditya R, Tumpal Ojahan Saputra, Asep Andri Siti Nurul Aisyiyah Jenie, Siti Nurul Aisyiyah Soesaptri Oediyani Sujoto, Vincent Sutresno Hadi Supriyadi, Harry Supriyatna, Yayat Iman Sutijan Syamsumin, Syamsumin Taharuddin Taharuddin Tampubolon, Aron Pangihutan Christian Tangkas, I Wayan Christ Widhi Herman Tumpal Ojahan Rajagukguk Utama, Andhika Putera Warmita, Helena Karunia Widi Astuti Yoga, Dwi Yuda, Aulia Pertiwi Tri Yuni Kusumastuti, Yuni Yuniati, Mutia Dewi Yusup Hendronursito, Yusup