Effect of periodic temperature shock on nitrogen removal performance and microbial community structure in plug-flow microaerobic sludge blanket. (February 2020)

• Record Type: Journal Article
• Authors: Ma, Xiao; Zhao, Bowei; Zhang, Xiao; Xie, Fei; Cui, Ying; Li, Hui; Yue, Xiuping
• Is Part Of: Chemosphere. Volume 241(2020)
• Publication Date: 2020-02
• Subjects: Periodic temperature shock -- Low temperature -- Nitrogen removal -- Microbial community structure -- Low C/N ratio; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.124934
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The positive effects nitrogen removal capability in a plug-flow microaerobic sludge blanket at low temperature are confirmed by inducing periodic high temperature shocks. This method enables enhancement of metabolic activity and an optimized bacterial community structure of microbes under the conditions of low C/N ratio and temperature. The control reactor was operated at a constant temperature of 20 °C, and the plug-flow microaerobic sludge blanket was subjected to a high temperature shock treatment with three cycles for 94 d. Starting with the initial temperature of 20 °C, after three cycles at temperature (30 °C) shock, the removal efficiencies of ammonium and total nitrogen at the terminal period increased to 68.0% and 54.7% from 51.1% to 35.6%, respectively. The activity and relative abundance of ammonia oxidizing bacteria, nitrite oxidizing bacteria, and anammox bacteria, dominated by Candidatus Brocadia at low temperature, were accordingly enhanced after periodic temperature shocks. Graphical abstract: Image 1 Highlights: A novel temperature shock strategy was proposed. The removal efficiencies of ammonium and TN increased by 16.9% and 19.1%. The proportion of AOB, NOB and anammox bacteria increased significantly. Functional bacteria thrived after temperature shocks.