Advanced Sewage Treatment with Ozone Under Excess Sludge Reduction,Disinfection and Removal of EDCs

摘要

A new advanced treatment system,which consists of biological nutrient removal process combined with reduction of excess sludge by ozonation and phosphorus recovery by crystallization and polishing-up ozonation process,was developed based on the fundamental studies and demonstrated by the demonstration plant set in AICHI EXPO 2005.Reduction of withdrawn excess sludge by 90% and phosphorus recovery by 70% were accomplished without any adverse effects on biological nutrient removal.The concentrations of SS,BOD,T-P and T-N in the effluent were less than 1.0,3.0,0.5 and 10 mg/L,respectively.EDCs were reduced to almost undetectable level and 2-log disinfection of Bacillus subtilis was established.The energy amount required for the operation was saved by 40% when compared with a conventional system to get the same level of water quality.