Abstract
The aerated fluidized bed biofilm reactor (FBBR) was evaluated for treatment of a corn starch wastewater at food‐to‐microorganism (F/M) ratios ranging from 0.42 to 1.61 g 5‐day biochemical oxygen demand (BOD5)/g total volatile solids (TVS)‐day. Laboratory results indicated that good combined carbon oxidation‐nitrification, with removal efficiencies greater than 90%, could be achieved providing that F/M ratio and mean cell residence time (MCRT) were maintained at less than 1.0gBOD5/g TVS‐day and longer than five days, respectively. More than 95% of reactor biomass in an aerated FBBR was immobilized on the fluidized media. Depending on the BOD5 loadings applied, between 25 to 75 mg TVS could be immobilized per gram of sand. Good oxygenation performance, with bulk‐liquid DO concentrations consistently greater than 3.0mg/L, was achievable because the fluidization requirements of media controlled the air injection rate. Both BOD5 removal and nitrification kinetics exhibited a pattern suggesting that mass transfer resistances of substrates could be significant within the region of low bulk‐liquid concentrations.
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