Ecological engineering of bioaugmentation from side-stream nitrification

Area of Science:

• Environmental engineering
• Microbial ecology
• Molecular biology

Background:

• Wastewater treatment success depends on integrating environmental engineering and microbial ecology principles.
• Bioaugmentation, introducing external organisms to wastewater reactors, requires understanding microbial survival mechanisms.

Purpose of the Study:

• To investigate the mechanisms of successful bioaugmentation in wastewater treatment.
• To understand how reactor configuration influences the community structure of ammonia-oxidising bacteria (AOB).

Main Methods:

• Utilized molecular biology tools for analysis.
• Employed molecular fingerprinting techniques to assess AOB community structure.
• Conducted phylogenetic analysis for diversity assessment.

Main Results:

• Side-stream reactor configuration significantly influenced AOB community structure.
• AOB communities in side-stream and main-stream reactors were highly similar across lab-scale and full-scale systems.
• Plug Flow Reactor (PFR) side-streams showed greater AOB diversity than Continuous Stirred-Tank Reactor (CSTR) side-streams within a PFR main-stream system; however, a full-scale side-stream resulted in an AOB monoculture.

Conclusions:

• Reactor configuration is a key factor in bioaugmentation success by shaping AOB communities.
• Molecular fingerprinting and phylogenetic analysis provide insights into microbial community dynamics during bioaugmentation.
• Further research may be needed to address potential biases in molecular techniques for diversity assessment.