Abstract
ABSTRACTBecause of severe space limitations for the reconstruction of its sewage‐treatment system, the city of Nagoya has evaluated a space‐saving wastewater treatment system comprising a solid‐liquid separator (SLS) and biological aerated filter (BAF). The SLS is filled with plastic media forming a 2 m thick layer, and influent suspended solids are removed through the media packed zone. The BAF plant has a 2 m thick layer packed with porous ceramic media and air is diffused from the bottom of the tank.The paper outlines the new treatment system and the ongoing study of the demonstration plant since 1992. It discusses the respective SS and BOD removal rates and concludes by showing that the new system can reduce retention period and plant area compared with the conventional activated‐sludge process.
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