Department of Built Environment, School of Engineering, Aalto University, P.O. Box 15200, Aalto, FI-00076 Espoo, Finland.
Institute of Water Research, University of Granada, Ramón y Cajal, 4, 18071 Granada, Spain.
Bioresour Technol. 2018 May;256:22-29. doi: 10.1016/j.biortech.2018.01.147. Epub 2018 Feb 2.
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, Arcobacter and Acinetobacter (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.
本研究旨在探讨在低温条件下，北极圈好氧颗粒污泥（AGS）系统的性能和微生物群落结构。为此，使用来自拉普兰的耐寒污泥，在 7、5 和 3°C 的温度下运行 AGS 生物反应器。在 5°C 时，该系统在氮、磷和有机物方面表现出可接受的转化速率。然而，在 3°C 以下，氮和磷的去除性能可忽略不计。在 5°C 以下，扫描电子显微镜研究表明颗粒结构呈丝状、稀疏且不规则，丝状菌大量生长。此外，Illumina 下一代测序显示出微生物种群的异质性，其中 SM1K20（古菌）、 Trichosporon domesticum（真菌）以及 Zooglea、Arcobacter 和 Acinetobacter（细菌）是优势菌群。本研究表明，北极污泥接种的 AGS 技术可在 5°C 以下的水温下运行，在寒冷地区运行时间可长达 3 个月以上（冬季）。
