GN/Fe2O3-based aerobic granular sludge for enhanced formation and synchronous nitrification-denitrification: Promote the secretion of polysaccharides and enrichment of denitrifying bacteria. (February 2023)

• Record Type: Journal Article
• Authors: He, Junguo; Liu, Xinping; Zeng, Yiwen; Jiang, Weixun; Yao, Juncheng; Qiu, Jiaqiang; Zhang, Yu; Wang, Mengfei
• Is Part Of: Journal of water process engineering. Volume 51(2023)
• Publication Date: 2023-02
• Subjects: Sewage treatment -- Aerobic granular sludge -- Nitrogen-doped graphene /ferric tetroxide (GN/Fe2O3) -- Synchronized nitrification and denitrification -- Polysaccharide; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.103475
• Languages: English
• ISSNs: 2214-7144

Abstract

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/Fe2 O3 ) 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/Fe2 O3 affect the formation and properties of AGS. The conclusions showed that GN/Fe2 O3 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/Fe2 O3, 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/Fe2 O3 . 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. Highlights: The presence of GN/Fe2 O3 was used to study acceleration of AGS formation. The particle size and biomass were improved by the AGS formed with GN/Fe2 O3 . PS secretion and bacteria about SND were promoted because of GN/Fe2 O3 . With excellent conductivity, the material had crucial effect on nitrogen removal rate.