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All Journal ASEAN Journal of Systems Engineering Jurnal Rekayasa Proses Jurnal Bahan Alam Terbarukan Seminar Nasional Teknik Kimia Kejuangan Journal of Degraded and Mining Lands Management Jurnal Sains & Teknologi Lingkungan Konversi Journal of the Civil Engineering Forum Communications in Science and Technology Jurnal Chemurgy Jurnal Rekayasa Proses Media Ilmiah Teknik Lingkungan INSIST (International Series on Interdisciplinary Research) Jurnal Inovasi Teknik Kimia Prosiding Conference on Research and Community Services Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri Hexagon
Ahmad Tawfiequrrahman Yuliansyah
Departemen Teknik Kimia, Fakultas Teknik, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Perbaikan Kualitas Air Yang Memiliki Konsentrasi Besi (Fe) Tinggi Menggunakan Single Tray Aerator Bagus Putro Budi Utomo; Ahmad T. Yuliansyah; Agus Prasetya
Media Ilmiah Teknik Lingkungan (MITL) Vol 5 No 2 (2020): Media Ilmiah Teknik Lingkungan (MITL)
Publisher : ​Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/mitl.v5i2.1195

Abstract

Air adalah salah satu sumber daya alam yang yang sangat penting bagi kehidupan manusia. Air tanah, yang menjadi sumber air di masyarakat, sering didapatkan mengandung konsentrasi besi (Fe) yang melebihi baku mutu. Air tersebut ditandai dengan adanya flek-flek warna kuning kecoklatan yang terdapat pada bak air atau perabotan yang berhubungan dengan air. Air yang mempunyai konsentrasi besi tinggi dapat menyebabkan gangguan kesehatan, misalnya: merusak dinding usus, iritasi pada mata dan kulit. Single tray aerator merupakan teknologi pengolahan air yang sederhana dan mudah dalam pengoperasiannya, sehingga dapat menjadi jawaban akan masalah air ini. Air yang telah diolah diharapkan dapat dimanfaatkan sebagaimana mestinya dan tidak berdampak buruk bagi manusia. Penilitian ini mencoba mencari media terbaik pada tray guna menurunkan konsentrasi besi pada air tanah. Terdapat 3 variasi media yang dilakukan pada peneilitian ini yaitu tanpa media, media zeolit dan media kerikil. Proses pengambilan sampel air dilakukan pada menit ke 5, 10, 15 dan 20. Didapatkan hasil dari penelitian ini bahwa kualitas air sebelum diolah adalah Fe = 1,65 mg/l. Data yang didapatkan 5 menit merupakan waktu efektif pada proses penurunan Fe pada air baku. Penggunaan single tray aerator tanpa media setelah diolah didapatkan hasil Fe = 1,23 mg/l, media kerikil didapatkan hasil Fe = 1,19 mg/l, dan percobaan terakhir menggunakan media zeolit didapatkan hasil Fe = 1,07 mg/l. Zeolit merupakan media terbaik pada penelitian ini dalam menurunkan konsentrasi Fe. Hasil pengolahan dari semua jenis variasi pada penelitian ini belum memenuhi baku mutu.
Kajian Kinerja Sistem Instalasi Pengolahan Air Limbah (IPAL) Komunal Erlina Kurnianingtyas; Agus Prasetya; Ahmad Tawfiequrrahman Yuliansyah
Media Ilmiah Teknik Lingkungan (MITL) Vol 5 No 1 (2020): Media Ilmiah Teknik Lingkungan
Publisher : ​Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.813 KB) | DOI: 10.33084/mitl.v5i1.1372

Abstract

IPAL Komunal Kalisong dibangun pada 2011 dengan menggabungkan sistem Anerobic Baffled Reactor (ABR) dan Anaerobic Filter (AF), namun belum dilakukan evaluasi kinerja IPAL Komunal. Pada operasional terdapat permasalahan seperti hasil efluent yang berwarna keruh dan masuknya limbah non domestik ke dalam instalasi IPAL. Penelitian ini bertujuan untuk mengkaji efisiensi pengurangan BOD, COD, TSS pada IPAL Komunal, mengidentifikasi dan mengkaji faktor teknis dan sosial penyebab penurunan kinerja IPAL. Analisis data mencangkup analisa kualitas efluent terhadap baku mutu, efisiensi unit pengolahan IPAL, dan kesesuaian bangunan dengan kriteria desain, sedangkan dari faktor sosial dilakukan wawancara kepada pengelola dan pengguna IPAL. Hasil kajian sosial menunjukkan pengelola dan pengguna IPAL belum melakukan pemeliharaan sesuai prosedur, sehingga berpengaruh terhadap performa IPAL. Pengguna IPAL mengalami penurunan dari 45 KK menjadi 21 KK, karena air limbah tidak mengalir. Debit air limbah 38,12 m3/hari, efluent yang dihasilkan dengan parameter pH 9,2, COD 180,99 mg/L dengan effisiensi 41,04 %, TSS 238,06 mg/L dengan effisiensi 71,55 %, dan BOD 87,09 mg/L dengan effisiensi 54,02 % yang belum sesuai dengan baku mutu. Nilai HRT eksisting dan HRT kriteria desain proses sedimentasi dan desain ABR masing-masing 8 jam serta 1,2-2 jam dan 22 jam serta > 8 jam. Pada AF nilai HRT eksisting dan kriteria desain yaitu 17 jam dan 24 – 48 jam. Penyebab IPAL Komunal tidak optimal adalah adanya limbah non domestik yang masuk, nilai HRT pada sedimentasi dan AF belum memenuhi kriteria desain dan kurangnya pemeliharaan oleh pengelola dan pengguna IPAL.
PENGARUH EPOKSIDASI MINYAK BIJI NYAMPLUNG (calophylluminophyllum L) DAN KOSURFAKTAN TERHADAP KINERJA SODIUM LIGNOSULFONAT (SLS) UNTUK ENHANCED OIL RECOVERY (EOR) Fitriani Fitriani; Suryo Purwono; Ahmad Tawfiequrrahman
Jurnal Inovasi Teknik Kimia Vol 2, No 1 (2017)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v2i1.1735

Abstract

Rendahnya kemampuan produksi minyak bumi Indonesia disebabkan karena lapangan minyak Indonesia sebagian besar merupakan sumur-sumur tua (mature fields), sehingga produksi minyaknya rendah. Dalam rangka menanggulangi turunnya produksi minyak bumi, telah dikembangkan teknologi Enhanced Oil Recovery (EOR).Salah satuteknologi EOR yaitu injeksi kimia yang dapat berupa surfaktan.Senyawa epoksida dibuat dari minyak biji nyamplung (callophyluminophyllum L) yang terlebih dahulu disabunkan. Reaksi epoksidasi dilakukan secara in-situ yang terdiri dari asam asetat dan hydrogen peroksida dan tahap selanjunya adalah reaksi asam perasetat dengan sabun.Reaksi dilakukan dalam reaktor batch yang dilengkapi pengaduk dengan variasi suhu 30, 40, 50, dan 600C dengan variasi waktu reaksi selama 15, 30, 60, dan 90 menit. Model kinetika reaksi epoksidasi diasumsikan mengikuti model pseudo-first dan berdasarkan persamaan Arrhenius diperoleh konstanta kecepatan reaksi epoksidasi minyak biji nyamplung adalah 16333,93 exp. Hasil penelitian menunjukkan bahwa penambahan 1-oktanol memberikan hasil yang lebih baik dibandingkankan 1-dekanol, dengan nilai IFT sebesar 2,2 x 10-3mN/m. Kata kunci : Enhanced Oil Recovery (EOR), epoksidasi, kosurfaktan, minyak biji nyamplung , sodium lignosulfonat (SLS)
BIOREMEDIATION OF TOFU INDUSTRY LIQUID WASTE USING EFFECTIVE MICROORGANISM-4 (EM4) SOLUTION (CASE STUDY OF TOFU SENTOSA INDUSTRY, YOGYAKARTA) Septina AVIA Avia; Budi Kamulyan; Ahmad Tawfiequrrahman Yuliansyah
ASEAN Journal of Systems Engineering Vol 6, No 1 (2022): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajse.v6i1.75615

Abstract

Liquid waste produced from the tofu industry contains high contaminants such as BOD, COD, TDS, pH, and TSS, which can pollute the environment. Therefore, pollutants should be decreased before being discharged into the environment. Tofu waste treatment is constrained by adequate technology and high costs. Biological treatment is one of the best treatments, a waste treatment process by utilizing microorganisms. This research used the intermittent anaerobic-aerobic process and was conducted on a laboratory scale using a tank made of glass 25 cm long, 20 cm wide, 15 cm high, and a tank of 30 cm long and 15 cm wide 15 cm high. The treatment process in this research used samples adding EM4 solution with a concentration of 1/20 and samples without EM4. The stages of the research were carried out consisting of preliminary research, core research, and further research. Preliminary research used 1/20 (5%) concentration of EM4 and was fermented for four days at room temperature. As a result, the pH value decreased from 6 to 4, and the presence of a white layer above the surface. The average pollutant reduction efficiency value in the sample with Effective Microorganism-4 (EM4) and without the Effective Microorganism-4 (EM4) was tested at different duration times for each parameter. The efficiency reduction value of the sample with EM4 of BOD was 87.14%, COD 74.68%, TSS 15.88%, and TDS -17.91%, while in the sample without EM4 of BOD value was 76.54%, COD 67.78%, TSS 22.77%, TDS -16.78% with a time process of 41st day.
Pengaruh Penambahan Silica Nanopartikel dan Surfaktan SLS (Sodium Lignosulfonat) terhadap Proses Adsorpsi pada Enhanced Oil Recovery (EOR) Handayani, Destias Selly; Yuliansyah, Ahmad Tawfiequrrahman; Purwono, Suryo
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

Surfactant flooding is a chemically enhanced oil recovery (EOR) technique that removes trapped residual oil by lowering the oil-water interfacial tension. The success of surfactant flooding is strongly affected by surfactant loss through its adsorption process on reservoir mineral rocks. Surfactant adsorption is a test method to determine whether surfactant is adsorbed in the reservoir rocks. In the surfactant adsorption test, only static adsorption was carried out. The mixed-surfactant formulation used 70% surfactant SLS, 22% PFAD, and 8% 1-octanol (w/v). Mixed-surfactant concentration variations are 0.25, 0.5, 0.75, and 1% (w/v). The IFT test results showed that the smallest IFT value at a concentration of 1% is 3.15 x 10-3 mN/M. In this research, adding silica nanoparticles (SNPs) to the mixed-surfactant solution is expected to reduce the interfacial tension (IFT) value and the amount of surfactant adsorbed in the reservoir rocks. Variations of SNPs concentration used are 0.05, 0.09, 0.15, and 0.3% (w/v). The lowest IFT test result by adding concentration SNPs of 0.09% is 2.07 x 10-4 mN/M. The adsorption test result showed that by adding SNPs with concentration 0.09%  with adsorption time of 24h is effective to used for adsorption.
Pengurangan Kadar Chrom dari Limbah Cair Industri Menggunakan Sistem Sub-Surface Flow Constructed Wetland (Ssf-Cw) dengan Tanaman Akar Wangi pada Media Kerikil dan Granul Fly Ash Hasanah, Nur Hayati; Yuliansyah, Ahmad Tawfiequrrahman; Prasetya, Agus
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

Sub-Surface Flow Constructed Wetland (SSF-CW) is one of the engineered of sewage treatment systems built and designed involving aquatic plants, soil or other media and related microbes, with more controlled treatment using sub-surface flow types. The purpose of this study was to determine the ability of aquatic plants to reduce of chromium (Cr) in wastewater, to understand the effect of fly media ash and gravel media in the constructed wetland system in reducing chrom  in wastewater. The Constructed Wetland was designed made of plastic with the Sub-Surface Flow Constructed Wetland (SSF-CW) model with 3 zones, zone 1 which is inlet zone and zone 3 which is outlet having dimensions of 37 x 54.5 x 60 cm, while zone 2 which is a reaction zone with dimensions 75 x 52.6 x 43.5 cm. The results showed that overall chrom removal from wastewater in RI, RII, RIII was 85.76, 93.24, and 74.69%, respectively. During the study, there was a growth of the plants, indicated by the presence of new shoots and an increase in the weight of plants. The kinetic model for reducing chromium content in wastewater at the RI, RII and RIII reactors follows the first order equation with a value of k value of 5.3411; 2,4006; and 0.1330.
Preparasi Katalisator Berbasis Biochar dari Ampas Buah Merah untuk Reaksi Transesterifikasi Minyak Jelantah Rahmah, Puspa; Yuliansyah, Ahmad Tawfiequrrahman; Wintoko, Joko
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2023: PROSIDING SNTKK 2023
Publisher : Seminar Nasional Teknik Kimia "Kejuangan"

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Abstract

Biodiesel can be produced from plant and animal oils by transesterification reaction using homogeneous or heterogeneous catalysts. In this study, we prepare a biochar-based catalyst, as a heterogeneous catalyst, for transesterification of used cooking oil. The biochar was made by the pyrolysis of the solid waste from the oil extraction of Papuan red fruit (Pandanus conoideus). After the pyrolysis, the solid was immersed in KOH solution to provide the kalium in the produced biochar. The biochar was then sulfonated by H2SO4 5M for 15h at 120°C. Afterwards, the catalysts were characterized by BET for surface area measurement, FTIR for functional groups on the catalyst surface determination and XRD for successive crystallography characterization. The catalytic performance was studied by conducting transesterification of used cooking oil using methanol with the prepared biochar-based catalysts. The transesterification optimum conditions were found to be oil to methanol molar ratio of 1:15, temperature of 60°C, reaction time of 2 hours and the catalyst amount of 3% of the oil weight. Furthermore, the highest biodiesel yield was obtained by the catalyst prepared from biochar that was sulfonated with 5M H2SO4 solution
ENVIRONMENTAL REVIEW INSTALASI PENGOLAHAN AIR LIMBAH (IPAL) KOMUNAL DI INDONESIA: STUDI KASUS IPAL KOMUNAL DI KABUPATEN SLEMAN YOGYAKARTA marendra, fajar; Saputri, Dwi; Prasetya, Agus; Yuliansyah, Ahmad Tawfiequrrahman
Hexagon Jurnal Teknik dan Sains Vol 5 No 2 (2024): HEXAGON - Edisi 10
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i2.4157

Abstract

he communal domestic wastewater treatment plant (WWTP) in Distrik of Sleman, Yogyakarta built in 2006 and the latest in 2018. In this study, the assessment of six environmental aspects, quality of effluent, geographic location, land topography, receiving water bodies, floods hazard, and soil types, was carried out in the communal WWTP in the District of Sleman, Yogyakarta. Data collection techniques using Stratified Random Sampling combine with interview technic and field surveys, then an assessment is carried out based on the Likert scale. The results showed that the quality of effluent aspect gets an average score of 2.57, soil types (2.60), geographic location (2.83), land topography (3.13), receiving water bodies (3.17), and floods hazard (3.63). The quality of effluent aspect can improve by integrated with fixed bed process or electrochemical process. Overall, the environmental category of WWTP in the District of Sleman, Yogyakarta, gets an average score of 2.99 from the maximum value of 4 (quite a good).
Adsorption studies of KOH-modified hydrochar derived from sugarcane bagasse for dye removal: Kinetic, isotherm, and thermodynamic study Lestari, Dwi Indah; Yuliansyah, Ahmad Tawfiequrrahman; Budiman, Arief
Communications in Science and Technology Vol 7 No 1 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.1.2022.669

Abstract

Toxicity of methylene blue (MB) in water bodies has a negative effect on environment and living organisms. The presence of MB in water could last longer in view of the non-biodegradable characteristic. In this study, hydrochar was used as adsorbent to remove MB from aqueous solution. Hydrochar derived from bagasse was successfully prepared by hydrothermal carbonization treatment at temperature of 270oC, and pressure of 10 Bar for 30 minutes. For enhancing the adsorption ability, hydrochar was activated by adding KOH that was able to increase the percent removal by ~11%. The hydrochar was characterized using FTIR before and after adsorption. The results showed that the dominant functional groups of hydrochar included O-H, C=O, -O- and aromatic compounds. Whereas, the functional group of azo groups such as N-H and N=N appeared after adsorption. The maximum adsorption capacity (Qmax) was 5.1204 mg/g, while the adsorption isotherm of MB onto hydrochar followed the Langmuir and Freundlich model. The adsorption mechanism belongs to chemical adsorption, and the rate of diffusion can be neglected because the adsorption kinetics fitted well with pseudo-second order and the value of k2 > kdif > k1. Thermodynamic studies indicated that the adsorption process is classified as endothermic and reversible at room temperature. The results showed that hydrochar could be the alternative adsorbent for removing MB in wastewater. In addition, sugarcane bagasse has a great potential as feedstock of hydrochar.
Kajian Pembuatan Katalis berbasis Biochar dari Biomassa untuk Transesterifikasi Minyak Jelantah menjadi Biodiesel Amalia, Riski; Yuliansyah, Ahmad Tawfiequrrahman; Cahyono, Rochim Bakti
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2023: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Katalis berbasis biochar yang dihasilkan dari biomassa telah menjadi subjek penelitian yang semakin berkembang dalam konteks transesterifikasi minyak jelantah menjadi biodiesel. Seiring dengan meningkatnya kebutuhan akan sumber energi yang berkelanjutan, biodiesel dari minyak jelantah menjadi alternatif menarik. Minyak jelantah adalah limbah dari industri makanan yang dapat digunakan sebagai bahan baku untuk produksi biodiesel yang ramah lingkungan. Namun, proses transesterifikasi membutuhkan katalis yang efektif dan berkelanjutan. Dalam konteks produksi biodiesel dari minyak jelantah, sintesis dan aplikasi katalis biochar ditempatkan sebagai elemen integral. katalis berbasis biochar juga memiliki keunggulan dalam hal biaya produksi yang lebih rendah dan ramah lingkungan dibandingkan dengan katalis konvensional. Review ini mengkaji perkembangan terbaru dalam pembuatan katalis berbasis biochar dari biomassa yang efektif dan ramah lingkungan untuk proses transesterifikasi minyak jelantah menjadi biodiesel. Biochar adalah bahan yang dihasilkan dari dekomposisi biomassa melalui pirolisis. Biochar memiliki struktur pori yang besar dan permukaan yang aktif sehingga dapat berperan sebagai katalis dalam reaksi transesterifikasi. Biochar, yang merupakan produk sampingan dari berbagai proses termal, menawarkan potensi yang menarik sebagai katalis alternatif yang berkelanjutan dan ramah lingkungan. Biochar yang digunakan sebagai bahan dasar katalis dihasilkan dari biomassa yang terdiri dari limbah pertanian dan kehutanan. Metode yang digunakan dalam penelitian ini adalah dengan memanfaatkan biomassa sebagai bahan baku untuk menghasilkan biochar. Biochar kemudian diaktivasi menggunakan bahan pengaktif tertentu agar memiliki sifat katalitik yang optimal. Proses transesterifikasi minyak jelantah menggunakan katalis biochar ini dilakukan dengan menambahkan alkohol sebagai reagen dalam kondisi tertentu.
Co-Authors Achmad Diansyukma Agus Prasetya Ahmad Hanafi Arief Budiman Asep P Zainuddin Aziz Askaputra Bagus Putro Budi Utomo Bratakusuma, Danu Britania Dewi Clarasinta Budi Kamulyan C. Chika Oktalia Putri Cahyono, Rochim Bakti Claudino de Almeida Cabral D Bratakusuma Danu Bratakusuma Dedi Eko Yunanto Dewi Purnama Sari Dewi Purnama Sari Dwi Saputri Dwi Saputri Edia Rahayuningsih Erlina Kurnianingtyas Fajar Marendra Fajar Marendra Fami Amalia Putri Fika Rofiek Mufakir Fika Rofieq Mufakhir Fitriani Fitriani Haidar Ali Handayani, Destias Selly Harimurti Wicaksono Hary Sulistyo Hasanah, Nur Hayati Himawan Tri Bayu Murti Petrus Imam Karfendi Putro Indra P Hakim Kidung Wulan Utami Lestari, Dwi Indah Lisendra Marbelia Mahfudl Sidiq Muhayyat Marendra, Fajar Mufakhir, Fika Rofieq Muhamad Johar Ardany Muhammad A. A. Ramadhan, Muhammad Muhammad Irsan B Muhammad Kurniawan Adiputra mulhidin, mulhidin Pasca Giffari Jusuf Rahmah, Puspa Reno Imam Arthapersada Riski Amalia, Riski Rizka Lestari Rizki Laksono, Rizki RR. Ella Evrita Hestiandari Rukmana Saputri, Dwi Sarto Sarto Septina AVIA Avia Shinta Virdhian shinta virdhian, shinta Sri Puji Saraswati Suprianto Suprianto Suryo Purwono Sutijan Wahyu Wilopo Widi Astuti Widi Astuti Widi Astuti Y Iskandar Yuni Rosita Yusuf Iskandar Zakiah Awalia J S Dahlan