Techno-Environmental Assessment of Biodiesel Production from Acid Oil via One-Step and Two-Step Esterification - Ni Ni Myint; Kongpetch Jaruensri; Netipon Sakulshah; Anusith Thanapimmetha; Maythee Saisriyoot; Nutchapon Chiarasumran; Hui-Min David Wang; Penjit Srinophakun (ACS Omega)