Role of cyclic diguanylate in affecting microbial community shifts at different pH during the operation of simultaneous partial nitrification, anammox and denitrification process

被引:24
|
作者
Wang, Chao [1 ]
Liu, Sitong [2 ]
Xu, Xiaochen [1 ]
Guo, Yongzhao [2 ]
Yang, Fenglin [1 ]
Wang, Dong [1 ]
机构
[1] Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Linggong Rd 2, Dalian 116024, Peoples R China
[2] Peking Univ, Dept Environm Engn, Beijing 100871, Peoples R China
基金
中国国家自然科学基金;
关键词
Anammox; Suspended sludge; Biofilm; Microbial community; Cyclic diguanylate; AMMONIA-OXIDIZING ARCHAEA; C-DI-GMP; NITROGEN REMOVAL; BIOFILM FORMATION; WASTE-WATER; SNAD PROCESS; SOIL-PH; BACTERIA; REACTOR; SLUDGE;
D O I
10.1016/j.scitotenv.2018.05.015
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The intracellular cyclic diguanylate acid (c-di-GMP) has emerged as a prominent second signal molecule that coordinates sessile-motile transition and biofilm formation in many bacteria. Herein, we study the role of c-di-GMP in affecting microbial community shifts at different pH levels during simultaneous partial nitrification, anammox and denitrification process (SNAD) in integrated fixed film activated sludge (IFAS) reactor. The results demonstrated that the contents of c-di-GMP notably decreased in suspended sludge, whereas the contents of c-di-GMP in biofilm had no significant change as pH gradually increased from 7.5 to 8.5. Most of the bacteria (Blastocatella, Brevundimonas) with flagella that have been reported to be regulated by c-di-GMP were present in suspended sludge, and the microbial community structure of suspended sludge had obvious change than biofilm. The increased alkaline pH reduced intracellular c-di-GMP content for increasing the motility of bacteria to be washed out from the reactor, causing the microbial community shifts in suspended sludge. This change would lead to the increase of nitrite-oxidizing bacteria which would inhibit anammox activity. Overall, this study provided more comprehensive information regarding the shifts of microbial community induced by c-di-GMP in SNAD-IFAS reactor. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:155 / 162
页数:8
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