A comparison between exogenous carriers enhanced aerobic granulation under low organic loading in the aspect of sludge characteristics, extracellular polymeric substances and microbial communities. (February 2022)

• Record Type: Journal Article
• Authors: Liu, Zhe; Zhang, Xuhua; Zhang, Shumin; Qi, Hao; Hou, Yiwen; Gao, Min; Wang, Jiaxuan; Zhang, Aining; Chen, Yiping; Liu, Yongjun
• Is Part Of: Bioresource technology. Volume 346(2022)
• Publication Date: 2022-02
• Subjects: Aerobic granular sludge -- Organic loading rate -- Exogenous carriers -- Extracellular polymeric substances -- Microbial community; 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.2021.126567
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The impacts of carriers on aerobic granulation under low OLR were evaluated. Adding carriers contributed to biomass retention and settleability improvement. Secretion of protein in EPS were obviously promoted with the dosing of PFS and AS. PFS and diatomite facilitated the accumulation of Paracoccus in aerobic granules. The abundance of genes about metabolism could be increased by adding carriers. Abstract: In this study, polymeric ferric sulfate (PFS), aluminum sulfate (AS) and diatomite were added to enhance the aerobic granulation under low organic loading rate (OLR) of 0.6 kg·COD/(m 3 ·d), and their effects of aerobic granule formation, extracellular polymeric substances (EPS) secretion and microbial community were investigated. The results showed that adding carriers could facilitated the growth of aerobic granules and improve the sludge settleability and biomass retention. Nutrient removal efficiencies were also enhanced. Compared with diatomite, adding PFS and AS resulted in more significant increase in EPS production, especially for the extracellular proteins. For microbial community, the dominated bacteria ( Zoogloea, 18.47–23.95%) in the mature granular consortia were similar. Moreover, the introduction of PFS and diatomite contributed to the enrichment of Paracoccus, which was responsible for denitrification. Adding carriers potentially activated the functional genes related to metabolism and genetic information processing, and PFS had the most significant effects.