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Updated: Apr 6, 2026

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor

Published on: October 15, 2015

Denitrification accelerates granular sludge formation in sequencing batch reactors.

E Suja¹, Y V Nancharaiah¹, T V Krishna Mohan²

¹Biofouling and Biofilm Processes Section, Water and Steam Chemistry Division, Bhabha Atomic Research Centre, Kalpakkam 603102, Tamil Nadu, India.

Bioresource Technology

|July 29, 2015

Summary

This summary is machine-generated.

Denitrification accelerates aerobic granular sludge formation in wastewater treatment. This process involves nitric oxide signaling and calcium carbonate precipitation, enhancing microbial aggregation and granulation efficiency.

Keywords:

Aerobic granular sludge Denitrification Nitric oxide signaling Nitrogen removal Sequencing batch reactor

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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

Area of Science:

Environmental microbiology
Wastewater treatment engineering
Biotechnology

Background:

Aerobic granular sludge (AGS) is crucial for efficient wastewater treatment.
Understanding factors accelerating AGS formation is vital for process optimization.
Denitrification's role in AGS development remains an area of active research.

Purpose of the Study:

To investigate the impact of denitrification on aerobic granular sludge formation in sequencing batch reactors (SBRs).
To elucidate the mechanisms by which denitrification influences sludge granulation.

Main Methods:

Comparison of AGS formation in SBRs with and without nitrate/nitrite feeding.
Sludge characterization including calcium content and mineral analysis.
Assessment of extracellular polymeric substances (EPS) production.
Utilizing sodium nitroprusside as a nitric oxide (NO) donor to study signaling pathways.

Main Results:

Faster AGS formation observed in reactors fed with nitrate or nitrite compared to controls.
Denitrification primarily occurred during the anoxic static fill phase.
Accumulation of calcium and calcium carbonate signatures identified in nitrate-fed SBRs.
NO donor enhanced microbial aggregation, EPS production, and AGS formation.

Conclusions:

Denitrification positively influences aerobic sludge granulation in SBRs.
Nitric oxide (NO) signaling and calcium carbonate (CaCO3) formation are key mechanisms facilitating granulation.
Nitrate and denitrification intermediates enhance microbial cell aggregation and accelerate AGS development.