Modification of biofilm carriers used in moving bed biofilm reactor (MBBR) by polydopamine nanoparticles for the treatment of synthetic wastewater containing chromium

Document Type : Original Research

Authors
farzan Fahimipour
Mohammad Delnavaz
Kharazmi University
Abstract
In this study, with the aim of improving the conditions for the formation and activity of biofilms on carriers in the moving bed biofilm process, the surface coating method with polydopamine was used. For this purpose, first, the conditions for the formation of polydopamine on Kaldness polymer beads and its effect on their hydrophilicity and roughness were investigated. Then, the growth rate of Acinetobacter Calcoaceticus bacteria, as one of the active species in the formation of biofilms in wastewater treatment, was investigated on the modified surfaces compared to the unmodified surfaces as a control sample. In the final stage, the improved K3 carrier were compared with the unmodified carrier during the MBBR reactor start-up process and the removal rate of chromium solution with a concentration of 50 mg/L. The results showed that polydopamine particles at a concentration of 2 mg/L and water and alcohol solution formed well on Kaldness polymer films, and coating with polydopamine solution increased the hydrophilicity and roughness of the Kaldness polymer films. The adhesion and growth test of Acinetobacter Calcoaceticus showed that more bacteria were formed and grown on the improved surface during 21 days. During the start-up process of MBBR reactors, the number of biofilms formed in 45 days of the modified carrier was higher and the efficiency of the system in removing chromium solution increased. Overall, the results showed that polydopamine coating can be used as a successful application method to improve the efficiency of Kaldness acnes.


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