Abstract
A new 3D printed layered filler with special layered internal structure was developed. Compared with the common polyhedral sphere filler, the nitrogen removal performance of layered filler in the treatment of simulated rural domestic sewage in moving bed biofilm reactor (MBBR) was studied. Numerical simulation was used to study hydrodynamic characteristics in the filler and reactor, and the results indicated that the spatial structure of the layered filler could block the diffusion of dissolved oxygen (DO), formed a hypoxic zone inside, and promoted the simultaneous nitrification–denitrification (SND). The COD, NH4+-N removal efficiency and volatile dry weight of the biofilm were measured at the reactor startup stage, which proved that layered filler was more satisfactory in biofilm growth performance, and the highest COD, NH4+-N removal efficiencies exceeded 90%. After biofilm matured, the nitrogen removal performance of the reactor was investigated under different DO concentrations. The removal efficiencies of NH4+-N and TN of the layered filler were above 75% when DO = 2 mg/L, which was significantly better than the control filler. The results showed that the layered filler could achieve SND inside the filler and better nitrogen removal in MBBR.
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At the point of finishing this manuscript, the authors would like to express sincere thanks to all those who have lent us hands in the course of our writing this manuscript. At the same time, the authors would like to acknowledge other researchers for assisting in providing references and information during the conduct of this research and manuscript.
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Zheng ZC and Wu YP are designers of the experiment and the executive of the experimental research in this study, completing data analysis and writing the first draft of the manuscript. Zhao B is involved in experimental design and analysis of experimental results. Wan AJ is the creator and the person in charge of the project, directing experimental design, data analysis, thesis writing and revision. All authors read and approved the final manuscript.
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Wan, A.J., Zheng, Z.C., Wu, Y.P. et al. Study on the performance of 3D printed layered filler in moving bed biofilm reactor. Int. J. Environ. Sci. Technol. 20, 4797–4810 (2023). https://doi.org/10.1007/s13762-022-04173-0
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DOI: https://doi.org/10.1007/s13762-022-04173-0