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Related Experiment Video

Updated: Jun 3, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on ¹⁴NH₄⁺/¹⁵NH₄⁺ Analyses via Sequential Conversion to N₂O

Published on: October 7, 2020

Development of denitrifying granules in sequencing batch reactors.

Ya-Juan Liu¹, Darren Delai Sun

¹Division of Environmental and Water Resources Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore. Liuy0031@e.ntu.edu.sg

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering

|April 7, 2011

Summary

This summary is machine-generated.

Shorter cycle times in sequencing batch reactors (SBRs) promote larger, faster-settling denitrifying granules with enhanced mechanical strength due to increased extracellular proteins, aiding nitrogen removal.

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Area of Science:

Environmental Science
Microbiology

Background:

Denitrifying granular sludge is crucial for efficient nitrogen removal in wastewater treatment.
Sequencing batch reactors (SBRs) are widely used for biological wastewater treatment.

Purpose of the Study:

To investigate the impact of different cycle times on the characteristics of denitrifying granules in SBRs.
To understand the factors influencing denitrifying granulation and granule properties.

Main Methods:

Cultivation of denitrifying granular sludge in SBRs at varying cycle times.
Analysis of granule size, settleability, mechanical strength, and extracellular polymeric substances (EPS) composition.

Main Results:

Complete denitrification was achieved across all tested cycle times.
Shorter cycle times resulted in larger, faster-settling granules with higher mechanical strength.
Extracellular proteins, not polysaccharides, were found to be key in denitrifying granulation.
Granule mechanical strength correlated with cell surface charge density.

Conclusions:

Shorter SBR cycle times are favorable for developing robust denitrifying granules.
Understanding EPS composition is vital for optimizing denitrifying granular sludge bioreactors.
These findings provide insights for the practical application of granular sludge technology in wastewater treatment.