Promphiphak, P., Chidchob, P. and Khamsuwan , S. 2026. Effect of Mixing on Biogas Production Rate in a Two-Stage Digester. Journal of Engineering and Industrial Technology, Kalasin University. 4, 2 (Apr. 2026), 1–11. DOI:https://doi.org/10.14456/jeit.2026.8.