Teeratitayangkul P, Sopajaree K. COD Removal of Cardboard Factory Wastewater by Upflow Anaerobic Filter. NUEJ [internet]. 2014 Dec. 18 [cited 2026 Sep. 10];9(1):1-5. available from: https://ph01.tci-thaijo.org/index.php/nuej/article/view/26083