Tangkan, Somkid, and Sirapassorn Phanthasa. 2024. “Comparative Analysis of Total Heavy Metal Removal in Influent and Effluent of the Oxidation Pond System at Ayutthaya Municipal Landfill”. PKRU SciTech Journal 8 (2):39-52. https://ph01.tci-thaijo.org/index.php/pkruscitech/article/view/257515.