Siriratpaibool W. Guidelines for estimating an appropriate wastewater treatment system: A case study of Health Region 8, Udon Thani Province. Health. Env. J. [internet]. 2025 Sep. 30 [cited 2025 Oct. 7];3(3):48-67. available from: https://he04.tci-thaijo.org/index.php/hpc8Journal/article/view/3589