“…Anaerobic digestion process is economically feasible as the method needs a low capital and operating cost by using covered lagoon as the digester type. (Choong, Chou, Norli, & Reviews, 2018;Medri & Costa, 2003;Sani et al, 2020). However, anaerobic digestions require large land area, long hydraulic retention time (HRT) and produces smelly odor (Lee et al, xxxx;Lee & San Lee, 2020;Wastewater Technology Fact Sheet Anaerobic Lagoons, 2002;Zainal, 2018).…”