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Use of a High-throughput In Vitro Microfluidic System to Develop Oral Multi-species Biofilms

Use of a High-throughput In Vitro Microfluidic System to Develop Oral Multi-species Biofilms

Published on: December 1, 2014

Analysis of Microbial Communities in Membrane Biofilm Reactors Using a High-Density Microarray.

Shilong Li¹, Liang Duan^1,2, Yang Zhao¹

¹State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.

|March 29, 2023

Summary

Extended operation time in membrane biofilm reactors (MBfRs) enhances nitrogen removal efficiency by altering microbial communities. Longer operation promotes beneficial microbial succession for better wastewater treatment.

Keywords:

high-density microarray membrane biofilm reactor microbial community nitrate removal operation time

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Published on: January 25, 2011

Area of Science:

Environmental Science
Microbiology
Chemical Engineering

Background:

Membrane biofilm reactors (MBfRs) are increasingly utilized for wastewater treatment due to high efficiency and low emissions.
Microbial community dynamics are crucial for MBfR performance, particularly nitrogen removal.
Operation time significantly influences microbial growth and community structure.

Purpose of the Study:

To investigate the impact of different operation times (30 vs. 60 days) on microbial composition and community succession in H2-based MBfRs.
To correlate microbial changes with nitrate-nitrogen (NO3--N) removal efficiency.
To understand the long-term stability and functional shifts in MBfR microbial communities.

Main Methods:

Operation of two parallel H2-based membrane biofilm reactors (MBfRs).
Comparative analysis of microbial composition and community succession at 30 and 60 days.
Assessment of nitrate-nitrogen (NO3--N) removal efficiency.
Phylogenetic analysis of dominant bacterial groups, including Proteobacteria.

Main Results:

MBfRs operated for 60 days showed higher NO3--N removal efficiency than those operated for 30 days.
Proteobacteria was the dominant phylum, but overall microbial community composition differed significantly between 30 and 60 days.
Despite decreased overall microbial concentration, specific functional microorganisms increased in abundance and diversity over time.
Microbial distribution similarity was low, and phylogenetic relationships of dominant bacteria varied with operation time.

Conclusions:

Operation time is a critical factor influencing microbial composition and community succession in H2-based MBfRs.
Extended operation (60 days) leads to improved nitrogen removal efficiency, linked to shifts in microbial community structure and function.
MBfR performance is strongly dependent on the establishment and succession of specific microbial consortia over time.