Performance and population structure of two carbon sources granular enhanced biological phosphorus removal systems at low temperature. (March 2020)

• Record Type: Journal Article
• Authors: Wang, Shaopo; Li, Zhu; Wang, Dong; Li, Yajing; Sun, Liping
• Is Part Of: Bioresource technology. Volume 300(2020)
• Publication Date: 2020-03
• Subjects: Carbon sources -- Low temperature -- Granular sludge -- Phosphorus removal -- 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.2019.122683
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Highly efficient PO4 3− -P and COD removal were achieved in SBR-1 and SBR-2. Granules disintegration attributed to filamentous bacteria ( Thiothrix ) at long-term low temperature. The acetate system preferred to utilize intracellular Mg/K-polyP to produce ATP for VFA uptake rather than glycogen. Dechloromonas could use both oxygen and nitrate as electron acceptors for phosphate uptake. Abstract: This study explored the effect of two carbon sources on performance and population structure of granular enhanced biological phosphorus removal systems at long-term low temperature by using two sequencing batch reactors, with acetate (SBR-1) and propionate (SBR-2) as carbon sources respectively. Results showed that highly efficient EBPR were successfully achieved, and the average PO4 3− -P and COD removal efficiency of SBR-1 and SBR-2 were 94.2%, 87.1% and 98.2%, 87.0%, respectively. Moreover, the acetate system preferred to utilize intracellular Mg/K-polyP to produce ATP for VFA uptake rather than glycogen. High-throughput sequencing analysis revealed that the abundance of Rhodocyclaceae were 31.7% (SBR-1) and 71.7% (SBR-2), and genus Dechloromonas was enriched to 60.5% with propionate, evidently higher than acetate (1.2%). Furthermore, in addition to oxygen, Dechloromonas could use nitrate as electron acceptors for phosphate uptake. The study further provides support to simultaneous nitrogen and phosphorus removal at low temperature.