A proposed aerobic granules size development scheme for aerobic granulation process

Area of Science:

• Environmental Science
• Microbiology
• Biotechnology

Background:

• Aerobic granulation is a key process in advanced wastewater treatment.
• Granule size is critical for physical properties and microbial functions.
• Understanding granule size development is essential for optimizing treatment efficiency.

Purpose of the Study:

• To investigate aerobic granule size development under phototrophic and non-phototrophic conditions.
• To establish a scheme for understanding the mechanism of granule size evolution.
• To compare size development trends in different bioreactor conditions.

Main Methods:

• Operation of two identical bioreactors (Rnp and Rp) under distinct physicochemical conditions.
• Monitoring and analysis of granule size variation over time.
• Development of an illustrative scheme to explain size development mechanisms.

Main Results:

• Activated sludge transformed into aerobic granules via increased biomass concentration.
• Granule size changes were observed to be consistent with biomass accumulation.
• Both phototrophic and non-phototrophic conditions yielded similar size development trends.

Conclusions:

• Aerobic granule size development follows a predictable pattern driven by biomass accumulation.
• Phototrophic conditions do not significantly alter the fundamental size development mechanism.
• The proposed scheme effectively illustrates aerobic granule size development.