Study on the hydrodynamic performance and treatment effect of a modified biological carrier in wastewater treatment

Abstract

A modified biological carrier used in the moving bed biofilm reactor was developed from the perspective of the constituent material and the structure, then its hydrodynamic performance and treatment effect in wastewater treatment were investigated, and the movement of the modified biological carriers was simulated by Flow 3D software. The results show that the specific surface area of the modified biological carrier prepared by mixing PA and HDPE materials is about 5.1 % higher than that of the existing biological carrier; the folded cylindrical structure is adopted, which makes the directions of the aeration and water flow though the interior of the modified biological carrier more deflected, and keeps the flushing and pushing with the flow all the time; the presence of the modified biological carriers plays a good role in the gas distribution, and a large number of vortices with different sizes are generated in the reactor, which enhances the mass transfer in the reactor; the average removal rate of COD is up to 88 %, and the maximum removal rate of NH3-N is up to 95 %, which indicates that the treat effect of the bioreactor is enhanced by the modified biological carriers. The modified biological carrier has the better hydrodynamic performance and treatment effect, which has the prospect of the popularization and application in the field of wastewater treatment.