ABSTRACT
ABSTRACT: Some municipal wastewater treatment plant using biological aerated filter as its main process for upgrading. The pre-denitrification and post-denitrification experiment studies were carried out by a pilot equipment with 2 m3/d designed capacity, and the parameters of each process unit in the studies were optimized. For pre-denitrification, the reflux ratio was 125%, the hydraulic retention time was 20 min, the CN filter and N filter gas-water ratio were 4:1 and 3:1 respectively. For post-denitrification, the hydraulic retention time was 45 min, the CN filter and N filter gas-water ratio were 6:1 and 5:1 respectively, and the methane dosage was 30 mg/L. Based on construction and operation cost analysis, the pre-denitrification upgrading plan was proposed.
