Ahmad, Adrianto, Evelyn Evelyn, David Andrio, Dini Avriliani, M. Dalil, and Amir Hamzah. 2026. “Sustainable Biohydrogen Production from Palm Oil Mill Effluent: Effect of Hydraulic Retention Time in a Hybrid Anaerobic System”. Leuser Journal of Environmental Studies 4 (1):69-78. https://doi.org/10.60084/ljes.v4i1.379.