Performance and microbial community structure of a polar Arctic Circle aerobic granular sludge system operating at low temperature. (May 2018)

• Record Type: Journal Article
• Authors: Gonzalez-Martinez, Alejandro; Muñoz-Palazon, Barbara; Maza-Márquez, Paula; Rodriguez-Sanchez, Alejandro; Gonzalez-Lopez, Jesus; Vahala, Riku
• Is Part Of: Bioresource technology. Volume 256(2018)
• Page Start: 22
• Page End: 29
• Publication Date: 2018-05
• Subjects: Aerobic granular sludge -- Low temperature -- Wastewater treatment -- Massive parallel sequencing -- North Pole; 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.2018.01.147
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Granular sludge bioreactor was acclimated from 7 °C to 3 °C. The system at 5 °C achieved high nitrogen, phosphate and Carbon removal performance. Granular biomass were washed out at 3 °C of operation. Dominant bacterial phylotypes were related to Zoogloea, Arcobacter and Acinetobacter . SM1K20 and Trichosporon domesticum were firstly reported in aerobic granules. Abstract: The aim of this work was to study the performance and microbial community structure of a polar Arctic Circle aerobic granular sludge (AGS) system operating at low temperature. Thus, an AGS bioreactor was operated at 7, 5 and 3 °C of temperature using a cold-adapted sludge from Lapland. At 5 °C, it yielded acceptable conversion rates, in terms of nitrogen, phosphorous, and organic matter. However, under 3 °C a negligible nitrogen and phosphorous removal performance was observed. Below 5 °C, scanning electron microscopy studies showed a wispy, non-dense and irregular granular structure with a strong outgrowth of filamentous. Moreover, Illumina next-generation sequencing showed a heterogeneous microbial population where SM1K20 ( Archaea ), Trichosporon domesticum ( Fungus ), and Zooglea, Arcobacte r and Acinetobacte r ( Bacteria ) were the dominant phylotypes. Our study suggests that AGS technologies inoculated with North Pole sludge could be operated, in cold regions for a period longer than 3 months (winter season) under 5 °C of water temperature.