Application of positively charged red mud-based carriers for anaerobic ammonium oxidizing bacteria biofilm formation

作者：Zhang, Wenjie^*; Wu, Huihao; Ping, Qiuzhe; Wen, Ruolan; Jin, Yue

来源：Environmental Pollution, 2023, 338: 122692.

DOI：10.1016/j.envpol.2023.122692

• Red mud
• Anammox bacteria
• Denitrification
• Mechanism

Enrichment of anaerobic ammonium oxidizing bacteria (AnAOB) in the anaerobic ammonium oxidation (anammox) process remains a challenge in engineering applications. In this study, for faster enrichment of AnAOB, red mud-based carriers were positively charged with FeCl3 and microbial promoters. The experimental results showed that the average nitrogen removal rates of the red mud-based carriers (RMGA), FeCl3-modified red mud-based carriers (RMGA-Fe), and microbial promoter-modified red mud-based carriers (RMGA-MA) increased by 24.4%-175% compared with the commercially available K3 carriers. Combining the results of SEM and laser confocal microscope, electrostatic attraction played a leading role on loading AnAOB. The increase in the surface roughness and specific area of the carriers after the attachment and the presence of Fe2+, Ca2+, and Mg2+ plasma were necessary for the subsequent growth of AnAOB, while the leaching of Cr(VI) promoted the nitrogen removal effect of AnAOB.

• 单位
  桂林理工大学