en عمومى General مقاله اصیل Original Article <div style="text-align: justify;">Background: Aleppo produces large amounts of municipal solid waste, making environmentally safe disposal essential. Dry anaerobic digestion is a promising method for treating the organic fraction of municipal solid waste (OFMSW) while generating renewable energy. Key parameters such as pH,<br> hydraulic retention time (HRT), organic loading rate (OLR), and temperature strongly affect biogas yield.<br> Methods: This study examined semi-continuous dry anaerobic digestion of OFMSW from Aleppo using two digesters operated at 35 &deg;C and 45 &deg;C. The substrate contained 25.03% total solids (TS) and 23.32% volatile solids (VS). The digesters were run for 70 days with OLRs of 4.66, 6.99, and 9.33 kg VS/ m&sup3;&middot;day.<br> Results: The best performance was observed at 45 &deg;C and an OLR of 6.99 kg VS/m&sup3;&middot;day, producing 0.431 m&sup3;/kg VS of biogas with a VS removal efficiency of 76.34%. Compared to 35 &deg;C, digestion at 45 &deg;C increased VS removal efficiency and biogas yield by 14.34% and 19.25%, respectively. However, raising OLR to 9.33 kg VS/m&sup3;&middot;day reduced both efficiency and productivity at both temperatures.<br> Conclusion: Higher temperatures enhanced both VS removal and biogas production, but excessive OLR negatively impacted performance. The study identifies 45 &deg;C and 6.99 kg VS/m&sup3;&middot;day as optimal conditions, providing guidance for improving OFMSW treatment and maximizing energy recovery.<br> These results highlight the potential of dry anaerobic digestion as a sustainable solution for managing organic waste in Aleppo and similar contexts.</div> Solid waste, Biofuels, Temperature, Anaerobic digestion, Methane 1 11 http://ehemj.com/browse.php?a_code=A-10-1-404&slc_lang=en&sid=1 Roaa Mohamed Rageh Salem roaa_salem@alepuniv.edu.sy 100319475328460021514 0009-0009-6067-1926 Yes Corresponding author: Department of Environmental Engineering Technologies, Aleppo University, Aleppo, Syria Nahed Hasan Farhoud nahedfarhod@gmail.com 100319475328460021515 100319475328460021515 No Department of Environmental Engineering Technologies, Aleppo University, Aleppo, Syria Hussain Aziz Saleh hussainazizsaleh@gmail.com 100319475328460021516 100319475328460021516 No Higher Institute of Earthquake Studies and Research, Damascus University, Damascus, Syria