performance evaluation of moving bed bio film reactor in saline wastewater treatment

background and purpose:moving bed biofilm reactor is an aerobic attached growth with better biofilm thickness control, lack of plugging and lower head loss. consequently, this system is greatly used by different wastewater treatment plants. high tds wastewater produced petrochemical, leather tanning, sea food processing, cannery, pickling and dairy industries. the aim of this study was to evaluate the performance of mbbr in saline wastewater treatment. materials and methods: in this study, 50 percent of a cylindrical reactor with 9.5 liter occupied media with 650 m2.m-3. in the first step, hydraulic regime was evaluated and startup reactor was done by sanitary sludge. bio film was generated with glucose as the sole carbon source in synthetic wastewater. mbbr performance evaluation was performed in 6:30 and 8:45 with saline wastewater after bio film produced on media. results: after 83 days of passing mbbr operation with saline wastewater containing 3000-12000 mg.l-1 tds, organic loading rate of 2.2-3.5 kg/m3.d cod removal efficiency reached 80-92%. conclusion: moving bed biofilm reactor is effective in organic load elimination from saline wastewater.