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Yuniar
Politeknik Negeri Sriwijaya
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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.
SINTESIS BIODIESEL DARI MINYAK KELAPA MENGGUNAKAN KATALIS HETEROGEN LIMBAH CANGKANG TELUR AYAM DENGAN VARIASI KECEPATAN PENGADUKAN DAN WAKTU REAKSI Alpin Purnama; Yusril Ihza Mahendra; Lety Trisnaliani; Yuniar; Apri Mujiyanti
Chemical Engineering Journal Storage (CEJS) Vol. 6 No. 4 (2026): Chemical Engineering Journal Storage (CEJS)- August 2026
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/cejs.v6i4.28970

Abstract

Penelitian ini bertujuan menganalisis pengaruh penggunaan katalis CaO berbahan dasar cangkang telur ayam dan Baffled Stirred Tank Reactor terhadap yield serta karakteristik biodiesel dari minyak kelapa. Katalis CaO diperoleh melalui proses kalsinasi pada suhu 900°C selama 4 jam dan dikarakterisasi menggunakan X-Ray Diffraction (XRD). Proses transesterifikasi dilakukan pada suhu 60°C menggunakan katalis CaO 3% dengan variasi kecepatan pengadukan 200–600 rpm dan waktu reaksi 20, 40, dan 60 menit. Hasil penelitian menunjukkan bahwa katalis didominasi oleh fase kristalin CaO. Kondisi optimum diperoleh pada kecepatan pengadukan 400 rpm dan waktu reaksi 40 menit dengan yield biodiesel sebesar 88,7%. Penggunaan baffle terbukti meningkatkan yield dibandingkan reaktor tanpa baffle. Biodiesel yang dihasilkan memenuhi persyaratan ASTM D6751 dengan viskositas 4,87–4,91 cSt, densitas 0,867–0,872 g/mL, flash point 168,3–176,2°C, dan angka setana 65,2–69,6. Nilai kalor juga meningkat dari 34,14 MJ/kg menjadi 37,44 MJ/kg seiring bertambahnya waktu reaksi. Hasil penelitian menunjukkan bahwa katalis CaO dari cangkang telur ayam dan penggunaan Baffled Stirred Tank Reactor efektif meningkatkan yield serta kualitas biodiesel.
Biobattery Products from Kepok Banana Peel and Key Lime Extract Using MgSO4 and CaCl2 Electrolytes with ABC Biobattery Standards of AA Size Oloan Surya Jaya S; Sofiah; Syariful Maliki; Fena Retyo Titani; Fia Dhatul Prima Kusuma; Yuniar
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 6 No. 2 (2026): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v6i2.530

Abstract

This study aims to investigate the potential of kepok banana peel (Musa paradisiaca L.) and key lime (Citrus amblycarpa) as raw materials for biobattery production and to evaluate the effects of KOH activation concentration and the addition of the ionic salts CaCl₂ and MgSO₄ on biobattery performance. Kepok banana peel was dried, ground into powder, and chemically activated using KOH solutions with concentrations ranging from 0.2 M to 1.0 M. The electrolyte was prepared by mixing key lime extract with 15 g of either CaCl₂ or MgSO₄, followed by the addition of activated banana peel powder. The resulting electrolyte mixture was packed into empty AA battery casings to fabricate the biobattery cells. The fabricated biobatteries were evaluated for pH, output voltage, loaded voltage, and operating time using a 2.2 V LED load. The results showed that the biobattery activated with 0.6 M KOH and supplemented with MgSO₄ exhibited the best performance, producing a maximum output voltage of 3.01 V (two cells connected in series), a loaded voltage of 1.75 V, and an operating time of 10 h 31 min. In contrast, activation concentrations that were either too low (0.2 M) or too high (1.0 M) reduced biobattery performance because insufficient or excessive ions hindered the electrochemical reactions. Furthermore, MgSO₄ was more effective than CaCl₂ in improving electrolyte conductivity and ionic stability. These findings indicate that organic waste, such as kepok banana peel and key lime, has considerable potential as a raw material for environmentally friendly biobatteries.
Reduction of Phenol Levels in Textile Wastewater Using ZnO-NiFe2O4 Photocatalysts with Variations in Mass and Contact Time Yuniar; Yulianto Wasiran; Rizky Brillian; Irani Pinanti; Vita Rahmawati; Nursilvia Syahnaz
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 6 No. 2 (2026): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v6i2.536

Abstract

The textile industry in Indonesia has an important role in the economy, but the presence of phenol is also one of the main causes of environmental pollution. Therefore, innovative solutions are needed to reduce this problem. By using Zinc Acetate Dihydrate you can obtain ZnO compounds, which are included in the category of photocatalyst compounds. ZnO has the potential as a catalyst in chemical reactions to break down organic and inorganic compounds that are harmful to the environment. Apart from that, this research also uses the NiFe2O4 compound synthesized from NiCl2 and FeCl3 as a doping agent which can reduce the ZnO band gap, thereby increasing the efficiency of photodegradation of dangerous compounds such as phenol. The research methods used consisted of ZnO synthesis and ZnO-NiFe2O4 synthesis and photocatalyst activation testing with variations in contact time of 0, 60, 120, 180 minutes and variations in the weight of the ZnO-NiFe2O4 photocatalyst of 0.5; 0.75; 1 gram. The characteristics of the resulting ZnO-Zeolite show a crystal size of 24.98 nm and absorption bands of Zn-O/Ni-O and Fe-O at wave numbers of 455 cm-1 and 580 cm-1. To determine the effect of the effectiveness of the ZnO-zeolite photocatalyst on textile liquid waste, pH, Chemical Oxygen Demand (COD), Total Suspended Solid (TSS) analysis and reduction in the concentration of phenolic compounds were carried out. Results Reduction of TSS value from 235 mg/L to 25.3 mg/L with a reduction percentage reaching 89.3% and degradation of phenol content from 3.625 mg/L to 0.067 mg/L which occurred at a mass variation of 0.75 grams and a contact time of 180 minutes.
Co-Authors Alpin Purnama Anerasari M Apri Mujiyanti Didiek Hari Nugroho Didiek Hari Nugroho Erika Dwi Oktaviani Fena Retyo Titani Fia Dhatul Prima Kusuma Irani Pinanti Lety Trisnaliani Nursilvia Syahnaz Oloan Surya Jaya S Rizky Brillian Sofiah Syariful Maliki Vita Rahmawati Wasiran, Yulianto Yuliansyah Yuliansyah Yusril Ihza Mahendra Zareena Rosli