Role of weak magnetic strength in the operation of aerobic granular reactor for wastewater treatment containing ammonia nitrogen concentration gradient. (February 2021)

• Record Type: Journal Article
• Authors: Wang, Hongyu; Lyu, Wanlin; Song, Qun; Zhou, Dao; Hu, Xiaoling; Wang, Bin; Chen, Rongfan
• Is Part Of: Bioresource technology. Volume 322(2021)
• Publication Date: 2021-02
• Subjects: Aerobic granular sludge -- Ammonia nitrogen load -- Nutrient removal -- Extracellular polymeric substances -- Weak magnetic field -- Bacterial communities; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.124570
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: 10 mT was beneficial for keeping granular stability. 10 mT enhanced the TN removal performances significantly under high NH4 + -N load. SND and SCND process play an important role in removing TN when applying WMF technology. Functional genus Candidatus_Competibacter contributed to efficient TN degradation rate. Abstract: Weak magnetic field (WMF) and aerobic granular sludge (AGS) technology were both robust technologies in wastewater treatments. In this study, the AGS characteristics and nutrient removal performances were all estimated at the load of 20 to 40 mg/L ammonia nitrogen (NH4 + -N) and 0 to 40mT magnetic field. Results showed that 10mT was beneficial for keeping stable structure of granules when increasing NH4 + -N load, accompanied with increasing protein (PN) secretion in EPS. Besides, all the total nitrogen (TN) removal rate under 10mT reached above 90%, while they were all less than 80% under other WMF strength when loading with 40 mg/L NH4 + -N. Moreover, the simultaneous nitrification and denitrification (SND) efficiency could be enhanced by WMF of 10mT. Illumina MiSeq sequencing showed that NH4 + -N load changed the bacterial richness and diversity when the magnetic strength was 10mT. And Candidatus_Competibacter was identified as the main functional genes for effective operation in this system.