The objective of this research were to compare the treatment efficiency of commercial media Septic-Aerobic Fixed-film Reactor system and media filled Septic-Submerged Anaerobic-Aerobic Fixed-film Factor system Hydraulic Retention Time at 36 hour and 48 hour. Each system was fed by riverside market wastewater at flow rate I m[superscript3]/d and organic loading rate 1.0 kg.BOD/m[superscript3]-d. It was found that the treatment efficiency of Septic-Aerobic Fixed-film Reactor system was similarly Septic-Submerged Anaerobic-Aerobic Fixed-film Reactor system Hydraulic Retention Time at 36 hour. The Septic-Aerobic Fixed-film Reactor system had the efficiency in total dissolved solids, suspended solids, settleable solids, BOD, sulfide, TKN, total phosphorus, grease and oil, and fecal coliform were 20.80%, 93.81%, 99.48%, 94.59%, 100.00% 84.78%, 11.53%,92.52% and 99.96% respectively. And the Septic-Submerged Anaerobic Aerobic Fixed-film Reactor system Hydraulic Retention Time at 36 hour had the efficiency in totaldissolved solids, suspended solids, settleable solids, BOD, sulfide, TKN, total phosphorus, grease and oil, and fecal coliform were 51.44%, 94.60%, 99.79%, 96.24%, 100.00%, 90.52%, 27.26%, 98.71% and 99.95% respectively. For the treatment efficiency of Septic-Submerged Anaerobic-Aerobic Fixed-film Reactor system Hydraulic Retention Time at 36 hour was similarly to the system that Hydraulic Retention Time at 48 hour. The Septic-Submerged Anaerobic-Aerobic Fixed-film Reactor Hydraulic Retention Time at 48 hour had the efficiency in total dissolved solids, suspended solids, settleable solids, BOD, sulfide, TKN, total phosphorus, grease and oil, and fecal coliform were 29.74%, 93.79%, 99.68%, 96.06%, 100.00%, 90.07%, 45.27%, 87.31% and 99.95% respectively.
