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All Journal Konversi Sriwijaya International Seminar on Energy-Environmental Science and Technology Jurnal Redoks Jurnal Abdimas Indonesia : Jurnal Abdimas Indonesia AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Chemical Engineering Journal Storage (CEJS) International Review of Practical Innovation, Technology and Green Energy (IRPITAGE) Jurnal Sains dan Ilmu Terapan Warta LPM JURNAL REKAYASA KIMIA & LINGKUNGAN
Didiek Hari Nugroho
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Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Social Sciences Other

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Recovery of Ammonia Solutions From Didiek Hari Nugroho
Sriwijaya International Seminar on Energy-Environmental Science and Technology Vol 1, No 1 (2014)
Publisher : Sriwijaya International Seminar on Energy-Environmental Science and Technology

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

Abstract

Jet bubble column is one of the methods that can be applied to reduce levels of ammonia solutions from a fertilizer industry wastewater. This study intends to evaluate the entrainment of gas volumetric flow rate, mass transfer, and ammonia removal efficiency. Process variables studied include effluent concentration (90-300 mg/L), the liquid volumetric flow rate (10-50 L/min), and nozzle diameter (8-12.7 mm). It was found that the liquid volumetric flow rate and nozzle diameter affects the volumetric rate of gas entrainment. The volumetric flow rate of gas entrainment can result in a significant effect on ammonia removal, while the ammonia concentration and volumetric flow rate of the liquid did not produce significant effects on ammonia removal. The overall volumetric mass transfer coefficients (KLa) have been calculated from obtained model and it was determined that increasing volumetric flow rate of gas entrainment have a very significant effect on KLa.
Pengurangan Kadar Amonia Dalam Limbah Cair Industri Menggunakan Kolom Gelembung Pnacaran Dengan Penambahan Solvent KOH Aprilia, Vita; Muhammad Zaman; Didiek Hari Nugroho
Jurnal Redoks Vol. 10 No. 1 (2025): REDOKS JANUARI - JUNI
Publisher : Universitass PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/redoks.v10i1.16641

Abstract

Permasalahan lingkungan yang dominan pada saat ini salah satunya berupa limbah cair yang berasaldari industri. Amonia merupakan senyawa yang dihasilkan dari proses industri pupuk. Sifat amoniayang toksik menyebabkan limbah amonia perlu dikelola dengan baik. Limbah amonia yang berasaldari berbagai unit operasi dalam pabrik urea yang berpotensi menimbulkan pencemaran selanjutnyalimbah dialirkan ke tempat penampungan dan diolah lebih lanjut. Tujuan penelitian ini adalahmelakukan pengurangan kadar amonia dengan menggunakan kolom gelembung pancaran melaluiproses udara stripping. Penelitian ini dilakukan dengan memvariasikan laju alir udara yaitu 12L/menit dan 16 L/menit serta variasi konsentrasi solvent KOH sebesar 0,1;0,2;0,3;0,4M; dan 0,5M;Kadar amonia dianalisis menggunakan alat Spektrofotometri Uv-Vis dengan panjang gelombang 460nm. Hasil analisis menunjukkan nilai koefisien transfer massa (KLa) terendah 0,228/jam dan nilai KLatertinggi 0,816/jam begitu juga dengan nilai efisiensi (%) stripping untuk penurunan amonia terendah20,34% dan nilai efisiensi (%) tertinggi 57,45%. Keadaan optimal berada pada nilai KLa 0,816/jamdan efisiensi(%) 57,45% pada variabel konsentrasi solvent KOH 0,3M dan Laju alir udara (Qg) 16L/menit.Kata Kunci: Amonia, Kolom Gelembung Pancaran, Limbah  
Pembuatan Sabun Padat Dari Minyak Jelantah Sebagai Solusi Limbah Cair Domestik Pada Pesantren Zaadul Ma’ad Kota Palembang Didiek Hari Nugroho; Linda Ekawati; Safril Kartika Wardana; Ayu Kalista; Yuliansyah Yuliansyah
Jurnal Abdimas Indonesia Vol. 4 No. 3 (2024): Juli-September 2024
Publisher : Perkumpulan Dosen Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53769/jai.v4i3.749

Abstract

Produksi limbah domestik berupa minyak jelantah di lingkugan pesantren Zaadul Ma’ad mencapai ± 50 liter per hari. Permasalahan tersebut memerlukan penanganan untuk mengurangi limbah yang diproduksi. Salah satu solusi penanganan minyak jelantah adalah konversi minyak jelantah menjadi sabun padat. Tujuan dari kegiatan yang telah dilakukan adalah untuk memberikan sosialisasi cara pengolahan limbah domestik yaitu minyak jelantah. Kegiatan dibagi menjadi dua yaitu Focus Grup Discussion (FGD) dan workshop. Peserta kegiatan workshop pembuatan sabun yang terdiri dari guru dan santri dibagi menjadi 3 kelompok kecil dengan jumlah peserta 5 orang untuk masing-masing kelompok. Setiap kelompok tersebut membuat sabun padat dari minyak jelantah, karbon aktif, natrium oksida (NaOH) dan pewangi. Dari hasil evaluasi, program ini berhasil memberdayakan civitas pesantren Zaadul Ma’ad, meningkatkan nilai guna limbah dan mengurangi limbah minyak jelantah.
Pengaruh Konsentrasi KOH dan K2CO3 pada Pembuatan Elektrolit Bio-baterai dari Limbah Kulit Pusing Ambon (Musa Paradisiaca) Putri, Nabilah Ayunisa; Abu Hasan; Nugroho, Didiek Hari
Chemical Engineering Journal Storage (CEJS) Vol. 5 No. 4 (2025): Chemical Engineering Journal Storage (CEJS)-Agustus 2025
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/cejs.v5i4.23640

Abstract

Limbah kulit pisang merupakan sumber biomassa yang berpotensi dimanfaatkan sebagai bahan elektrolit ramah lingkungan dalam bio-baterai. Penelitian ini mengkaji pengaruh jenis dan konsentrasi pelarut KOH dan K2CO3 terhadap karakteristik elektrolit bio-baterai dari kulit pisang ambon (Musa paradisiaca). Metode yang digunakan bersifat eksperimental dengan variasi konsentrasi pelarut (0,5 M–2 M) dan massa kulit pisang (15 g dan 30 g). Parameter yang diamati meliputi tegangan, arus, daya listrik, pH, konduktivitas, kapasitas, korosi elektroda, serta uji aplikasi pada lampu LED dan mini fan. Hasil menunjukkan bahwa KOH 1 M dengan 30 g kulit pisang menghasilkan daya maksimum 14,52 mW dan kapasitas 172,53 mAh, meskipun dengan tingkat korosi elektroda yang tinggi. Sebaliknya, K2CO3 lebih stabil dan tidak terlalu korosif, namun daya listriknya lebih rendah. Uji aplikasi menunjukkan bio-baterai dapat menyalakan LED selama 3 jam 28 menit dan mini fan dengan kecepatan penuh. Dengan demikian, limbah kulit pisang berpotensi sebagai bahan elektrolit bio-baterai, dengan jenis dan konsentrasi pelarut sebagai faktor kunci optimasi kinerja dan ketahanan.
Pengaruh Nozzle Terhadap Aspek Hidrodinamika Kinerja Kolom Gelembung Pancaran Nugroho, Didiek Hari; Adisalamun, Adisalamun; Machdar, Izarul
Jurnal Rekayasa Kimia & Lingkungan Vol 10, No 2 (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.v10i2.2424

Abstract

Kolom gelembung pancaran merupakan salah satu alat perpindahan massa antara fasa gas dan cair. Penelitian ini bermaksud untuk mempelajari pengaruh nozzle terhadap aspek hidrodinamika antara lain: kedalaman penetrasi gelembung (Z), holdup gas (eg), dan laju alir volumetrik gas entrainment (Ql) yang terjadi dalam kolom gelembung pancaran. Variabel proses yang dipelajari antara lain laju alir volumetrik cairan (10-50 L/menit), ukuran diameter nozzle (0,008-0,0127 m), dan tinggi nozzle (0,125-0,25 m). Hasil penelitian memperlihatkan bahwa ukuran diameter nozzle semakin kecil dan laju alir volumetrik cairan yang semakin besar menghasikan laju alir volumetrik gas entrainment, holdup gas, dan kedalaman penetrasi gelembung yang semakin besar.
The Role of Jet Bubble Column Technology in Domestic Wastewater Treatment at Pesantren Zaadul Ma’ad Yuniar; Didiek Hari Nugroho; Yuliansyah Yuliansyah
Warta LPM WARTA LPM, Vol. 29, No. 1, Maret 2026
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/warta.v29i1.13006

Abstract

Domestic wastewater in Islamic boarding schools is commonly managed using simple holding ponds without standardized treatment, resulting in high turbidity, elevated suspended solids, ammonia accumulation, and low dissolved oxygen levels. These conditions negatively affect environmental quality, sanitation, and the health of the community. Pesantren Zaadul Ma’ad experienced similar problems, with initial wastewater characteristics showing low dissolved oxygen (3.85 mg/L), turbidity of 49.3 NTU, total suspended solids (TSS) of approximately 50 mg/L, and ammonia concentrations around 30 mg/L. This community engagement program aimed to apply Jet Bubble Column (JBC) technology to improve wastewater quality and to strengthen the capacity of students and teachers in managing simple wastewater treatment systems. The program was carried out using a structured Participatory Action Research (PAR) approach, consisting of socialization, operational training, installation of the JBC unit, operational mentoring, periodic monitoring, and sustainability planning. The JBC system was installed in the wastewater holding pond and integrated with a multilayer filtration unit. Water quality monitoring was conducted using portable instruments to measure pH, dissolved oxygen (DO), total dissolved solids (TDS), turbidity, total suspended solids (TSS), and ammonia (NH₃). The implementation of JBC technology resulted in significant improvements in wastewater quality. DO levels increased to above 5 mg/L, ammonia concentrations decreased by 80–90%, TSS levels were reduced by more than 50%, and turbidity dropped to below 1 NTU. These improvements indicate a transition from anaerobic to stable aerobic conditions, highlighting the effectiveness of microbubble aeration combined with multilayer filtration in treating domestic wastewater. Beyond the technical results, the program strengthened local management capacity through the training of internal operators, the development of standard operating procedures (SOPs), and the integration of sanitation topics into educational activities. Recommended follow-up actions include optimizing the JBC design for greater efficiency, expanding the use of treated water for non-consumptive purposes, and replicating the model in other boarding schools as part of a broader effort to support decentralized and sustainable wastewater management systems.
PROCESSING USED COOKING OIL INTO AN ENVIRONMENTALLY FRIENDLY PRODUCT AS A CREATIVE ECONOMIC SOLUTION Yuniar; Anerasari M; Didiek Hari Nugroho; Erika Dwi Oktaviani; Zareena Rosli
International Review of Practical Innovation, Technology and Green Energy (IRPITAGE) Vol. 5 No. 3 (2025): November 2025 - February 2026
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.19464524

Abstract

Used cooking oil (UCO) from institutional kitchens poses environmental and health risks if improperly disposed of. This community programme, jointly organised by Politeknik Negeri Sriwijaya and Politeknik Malaysia Merlimau, aimed to introduce a simple method for converting UCO into solid soap, an eco-friendly and economically valuable product. The activity employed an applied mixed-methods design, comprising pre-assessment, technical training, hands-on practice, and post-evaluation. Participants learned about UCO purification, saponification, and safe handling of NaOH. Results indicate a substantial increase in participants’ knowledge and awareness, with 100% of respondents demonstrating improved understanding of UCO hazards and soap-making procedures. Practical implementation was successful, yielding approximately 150 bars of solid soap during the workshop. All participants expressed willingness to continue soap production independently due to its low cost, environmental benefits, and potential for micro-enterprise. The programme demonstrates that simple, community-based technical interventions can effectively enhance practical competence and promote sustainable waste valorisation. This model shows strong potential for replication in similar educational and community settings.
The effect of Ni/Al2O3 catalyst mass variation and operation time on the CO2 methanation process Yongki Pratama; Robert Junaidi; Didiek Hari Nugroho
Konversi Vol 14, No 2 (2025): OCTOBER 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i2.23597

Abstract

Carbon dioxide (CO2) is one of the biggest contributors to the greenhouse effect. Based on data from the International Energy Agency (IEA), greenhouse gas (GHG) emissions continue to increase, reaching 37.8 billion tons in 2024. One way to reduce carbon dioxide (CO2) is to convert carbon dioxide (CO2) into methane (CH4) through a methanation process using a Fixed Bed Reactor. This study was conducted by varying the mass of Ni/Al2O3 catalyst between 55 grams and 60 grams and the operating time between 90, 100, 110, 120, and 130 minutes, as well as adding 20 grams of Zn promoter to improve catalyst stability performance. A Multi Gas Detector Analyzer was used to analyze the methane (CH4) gas produced. The results of this study showed that the highest percentage of methane gas (CH4) produced was obtained in sample 10 with a Ni/Al2O3 catalyst mass of 60 grams and an operating time of 130 minutes, which was 58.35%.
The ability of the Ni/Al2O3 catalyst in the CO2 methanation process in terms of variations in CO2 flow rate and catalyst Sultan Parega; Robert Junaidi; Didiek Hari Nugroho; Helda Niawanti
Konversi Vol 13, No 2 (2024): OKTOBER 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v13i2.20235

Abstract

Carbon dioxide (CO2) is one of the biggest contributors to the greenhouse effect. Based on International Energy Agency (IEA) data, global emissions of carbon dioxide (CO2) from burning energy and industrial activities will reach 36.8 billion tons in 2022. The increase in emissions in 2022 will mainly come from burning coal and fuel oil (Fuel Oil). Carbon dioxide emissions from coal rose 1.6% while fuel oil emissions increased 2.5%. One effort to reduce carbon dioxide emissions is to convert carbon dioxide into methane gas (CH4) which can be used as fuel. This research aims to produce methane gas from carbon dioxide using Ni/Al2O3 catalyst treatment and varying CO2 flow rates. In this research, CO2 was used as a raw material with a Ni/Al2O3 catalyst and Zn metal. Based on the research results, the highest conversion yield of methane gas was 49.23% with a variation of 0.05 L/minute with Ni_R4 catalyst treatment
Kinetika Absorbsi CO2 dari Gas Emisi Kendaraan Bermotor dengan Menggunakan Absorben Monoethanolamine (MEA) pada Reaktor Gelembung Pancaran Wahyu Andanu; Didiek Hari Nugroho; Akbar Ismi A P
Jurnal Sains dan Ilmu Terapan Vol. 8 No. 1 (2025): Jurnal Sains dan Ilmu Terapan
Publisher : Politeknik Kampar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59061/jsit.v8i1.944

Abstract

Exhaust gas produced by motor vehicles contains several types of emissions, such as carbon monoxide (CO), hydrocarbons (HC), oxides of nitrogen (NOx), dust particles including lead (Pb), oxides of sulfur (SOx), and carbon dioxide (CO2). The content of the exhaust gas consists of about 30% carbon dioxide, 27% carbon monoxide, 25% hydrocarbons, 10% oxides of nitrogen, 9% oxides of sulfur, and 8% dust particles. Of the various types of polluting gases, carbon dioxide (CO2), carbon monoxide (CO), and hydrocarbons (HC) account for the highest percentage of harmful gases. Excessive concentrations of CO2 in the air can trigger the greenhouse effect, which contributes to an increase in atmospheric temperature and causes global warming. Carbon dioxide (CO2) in high concentrations can cause respiratory distress, although at levels below 1.5% by volume it is not considered harmful. Therefore, methods are needed to reduce air pollution, particularly that caused by CO2.
Co-Authors Abu Hasan Adisalamun Adisalamun Akbar Ismi A P Anerasari M Aprilia, Vita ayu Kalista Ekawati, Linda Erika Dwi Oktaviani Erwana Dewi Ghazzi Al Gufari Helda Niawanti Izarul Machdar Izarul Machdar, Izarul Muhammad Zaman Putri, Nabilah Ayunisa Robert Junaidi Robert Junaidi Rusdianasari Rusdianasari Safril Kartika Wardana Selvia Sultan Parega Wahyu Andanu Yongki Pratama Yuliansyah Yuliansyah Yuliansyah Yuliansyah Yuniar Zareena Rosli