Abstract
Aerobic granular sludge (AGS) has attracted much attention because of its unique layered structure and excellent treatment efficiency. Here, a robust nitrogen-doped graphene / ferric tetroxide (GN/Fe2O3) based aerobic granule sludge has been fabricated for rapid granulation and enhanced synchronous nitrification-denitrification (SND). The results showed that the average particle size increased by 45.74%, and the efficiency of SND had been improved by 37.1%. In addition, this experiment could further comprehend how the characteristics of GN/Fe2O3 affect the formation and properties of AGS. The conclusions showed that GN/Fe2O3 significantly improved the sedimentation performance, particle size, and removal efficiency compared with the control. Meanwhile, the values of polysaccharide (PS) increased by up to 74% after the addition of GN/Fe2O3, indicating the production of substances was induced by the material. Molecular biology methods indicated that the rapid production and removal of granulation nutrients was considered to be rich in polysaccharide-secreting bacteria and heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria after adding GN/Fe2O3. This study extends the concept of aerobic granular sludge cultivation and provides a new idea to guide the cultivation of aerobic granular sludge providing technical support for the application of AGS in the wastewater treatment industry.
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