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Municipal Wastewater Treatment by Moving‐Bed‐Biofilm Reactor with Diatomaceous Earth as Carriers

This study was conducted to examine the feasibility of using a moving‐bed‐biofilm reactor with internal circulation through aeration for the treatment of municipal wastewater. The attached film was a mixed‐microorganism consortium, which used composite‐refined‐diatomaceous earth as novel biomass carriers to form a diatomaceous‐earth‐moving‐bed‐biofilm‐reactor (DEMBBR) process. The startup of laboratory‐scale, continuous‐flow reactor was successfully achieved without seeding activated sludge. The DEMBBR process removed chemical oxygen demand, total phosphorus, ammonium‐nitrogen, and turbidity at the highest rate of 88.5, 83, 92.3, and 96.7%, respectively, with a hydraulic retention time of only 2.5 hours. The DEMBBR was less affected by interruption and adverse operation conditions than the conventional‐activated‐sludge reactor. Thus, the DEMBBR could be proposed to be a cost‐effective, small‐wastewater‐treatment‐process unit.