Abstract
A multi-channel wavy filler for moving bed biofilm reactor (MBBR) was prepared using 3D printing technology. The treatment effect of the 3D printed filler on simulated rural domestic sewage was tested and the control filler was a widely used multi-faced hollow ball filler. The results showed that the 3D printed filler has a biofilm formation rate more than 20 % higher than that of the control filler at the startup stage. The 3D printed filler works best when the aeration is 1–1.5 L/min, HRT is 4 h, and the pH is 7.5. The COD removal rate is 88.95 % and the ammonia nitrogen removal rate is 93.43 %. The effects of different fillers on the velocity field, vorticity distribution and gas phase distribution in the reactor were analyzed by numerical simulation. The compact and tortuous gully structure on the surface of the multi-channel wavy filler has a good cutting and breaking effect on the bubbles. Its gradually narrowed channel structure reduces the gradient of dissolved oxygen from the outside to the inside of the filler, providing a good environment for simultaneous nitrification and denitrification.
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