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All Journal JURNAL PSIKOLOGI UDAYANA JEJAK EKONOBIS (JURNAL EKONOMI DAN BISNIS) Buletin Farmatera JURNAL PENDIDIKAN TAMBUSAI Unnes Journal of Public Health Ilomata International Journal of Management Jurnal Pengabdian kepada Masyarakat Nusantara Indonesian Journal of Chemical Science and Technology Ilomata International Journal of Management Jurnal Kesehatan Tambusai Jurnal Ilmiah Raflesia Akuntansi Education Achievement: Journal of Science and Research KARYA: Jurnal Pengabdian Kepada Masyarakat Kontribusi: Jurnal Penelitian dan Pengabdian Kepada Masyarakat Aptekmas : Jurnal Pengabdian Kepada Masyarakat Edu Society: Jurnal Pendidikan, Ilmu Sosial dan Pengabdian Kepada Masyarakat Geosfera: Jurnal Penelitian Geografi PANDU: Jurnal Pendidikan Anak dan Pendidikan Umum Jurnal Ilmiah Ekonomi dan Manajemen Jurnal Sains dan Kesehatan MPSJ SULIWA: Jurnal Multidisiplin Teknik, Sains, Pendidikan dan Teknologi
Ayu Andini
Program Studi Psikologi, Fakultas Kedokteran, Universitas Udayana
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary Other

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Journal : Indonesian Journal of Chemical Science and Technology

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Influence of EM4 Inoculum on Biogas Yield and pH Dynamics in Lettuce and Cabbage Waste Fermentation Ramadhan, Dwi Sapri; Safitri, Wulan Dwi; Wardana, Dian; Fahmi, Jam'an; Zubir, Moondra; Andini, Ayu; Simamora, Elisabeth; Limbong, Julian; Sihotang, Pelita; Husna, Wiki Nadia; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70612

Abstract

Biogas production from vegetable waste offers a practical pathway for reducing organic residues and supporting small-scale renewable energy systems. This study investigates the influence of EM4 inoculum on gas accumulation and pH dynamics during an 8-day batch fermentation of lettuce and cabbage waste. Four reactors were prepared containing 200 g vegetable waste and 200 mL water with or without 30 g EM4. Gas accumulation was quantified by balloon circumference at day 2, day 4, day 6 and day 8 and converted to volume using geometric calculations. Lettuce generated the highest peak volumes with maximum values exceeding 330 cm³ while cabbage produced less than 60 cm³ under comparable conditions. pH trajectories showed that cabbage plus water decreased from pH 7 to pH 6 whereas lettuce plus water increased from pH 7 to pH 8. Reactors containing EM4 stabilised at pH 6 throughout the fermentation indicating inoculum-supported buffering. These results demonstrate that substrate characteristics strongly influence early-stage gas formation and that EM4 moderates pH fluctuations even under uncontrolled ambient conditions. The findings provide initial evidence that lettuce is a more degradable feedstock than cabbage and emphasise pH regulation as a key requirement for improving methane-oriented biogas performance in simple batch systems.
Co-Authors Abdul Fatah Ahmad Iskandar Ahmadi, Lusiana Putri Aji Ramansyah, Juni Andri Soemitra Apriani, Neriza Armita Sari, Siti Awalia Rosfyan, Ummi Azmi, Zul Berlian Berlian Cahyani, Cica CHANIAGO, LITA SEPTINA Cucu Nurhayati, Cucu Delli Yuliana Rahmat Dharma, Budi Dona Wahyuning Laily Drama, Banita Ihfatun Eka Yusnaldi Eko Hariyadi Eni Kartika Sari, Eni Kartika Fahmi, Jam'an Febriani, Adha Fitriasari, Dean Dwi Fuadi, Helmy Gunawan Aji Hamka Hasan, Hamka Hannase, Mulawarman Harti Widiastuti Hasibuan, Siti Marhamah Hasuna, Kamal Hilmi Uly Ul Hidayah Husna, Wiki Nadia Imaduddin, Rahadian Iswanti, Iswanti Johani Johani, Johani Khairul Wafa, Muhammad Krisna Rendi Awalludin Limbong, Julian Masdar, Akmal Metti Rahma Saniagi Mia Pangestu, Kania Muhammad Aras Prabowo Muhdiah, Muhdiah Muid N, Abd. Muzakkir Baits, Muzakkir Nahariyah, Rif’atun Naif, Naif Nasaruddin Umar, Nasaruddin Nasarudin, Nasar Novia, Nurul Yogi Nurdin Siregar Nurhidaya Nurhidaya Purnama, Ahmad Putri, Mega Karina Putri, Salisah Radiansyah, Egi Rahmi Rahmi Ramadhan, Dwi Sapri Ramanda, Zey Ali Samsir Raya, Ahmad Thib Ridwan, Heri Riska Riska Robitah Asfur Rochmah, Febby Anggraeni Saenong, Farid F. Saepudin Safitri, Latiana Safitri, Wulan Dwi Shafa Salsabila Sihotang, Pelita Simamora, Elisabeth Siregar, Putri Darnisah Siti Samsiah, Siti Sri Lestari St Maryam, St Sugiasih, Intan Supriyadi Supriyadi Syahrullah Iskandar, Syahrullah Syawala, Malica Ayumba Wardana, Dian Yulianto, Diky Yuliasari, Firda Yusuf, Arief Rahman Zahra Aulia, Febria Zubir, Moondra Zuhairan Yunmi Yunan