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pp.679-685
The Soysauce wastewater removal characteristics of submerged biofilters filled with two filter media respectively were experimentally examined with constant temperature, pH value and variable BOD loading and recirculation ratio.
The decreasing order of BOD removal is Netring(random plastic media), cubic wire meshes(plastic module).
This is mainly due to the media characteristics such as void ratio, specific surface area and media shapes. The BOD removal ratio decreases with increasing BOD_5 volumetric loading rate, and the loading rate for the BOD removal over 85% is lower than 1.5㎏BOD_5/㎡d for the plastic media of Netring and cubic wire meshes. The BOD_5 removal rate increases with the recirculation ratio, but the rate of increase become smaller as the recirculation ratio increases over 20.
When BOD_5 volumetric loading is 1.5㎏BOD_5/㎡d, the required recirculation ratio to obtain 85% BOD_5 removal is about 20 for Netring and it was about 30 for cubic wire meshes.
