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Going for mainstream deammonification from bench to full scale for maximized resource efficiency.

B Wett¹, A Omari, S M Podmirseg

¹ARAconsult, Unterbergerstr.1, A-6020 Innsbruck, Austria. wett@araconsult.at

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|July 19, 2013

Summary

This study investigated enhancing anammox bacteria in wastewater treatment using selective sludge wasting and intermittent aeration. The goal was to optimize deammonification for efficient nitrogen removal.

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Area of Science:

Environmental Engineering
Microbiology
Wastewater Treatment

Background:

Mainstream wastewater treatment typically relies on conventional nitrification and denitrification.
Anammox (anaerobic ammonium oxidation) offers a more energy-efficient pathway for nitrogen removal.
Optimizing conditions for anammox bacteria in mainstream systems remains a challenge.

Purpose of the Study:

To investigate the bioaugmentation, enrichment, and performance of anammox organisms in mainstream wastewater treatment.
To evaluate process conditions and operational modes for enhancing deammonification.
To direct more nitrogen towards the resource-saving deammonification metabolic route.

Main Methods:

A coordinated research effort across three experimental scales.
Application of density-based sludge wasting using a selective cyclone to retain anammox granules.
Implementation of intermittent aeration to selectively repress nitrite-oxidizing bacteria.

Main Results:

Successful retention of anammox granules through selective sludge wasting.
Demonstrated ability to control nitrite oxidizers using intermittent aeration.
Evaluation of process parameters to favor deammonification.

Conclusions:

Density-based sludge wasting and intermittent aeration are effective strategies for anammox enrichment in mainstream treatment.
Optimized process conditions can enhance the performance of deammonification.
These methods offer a resource-saving approach to nitrogen management in wastewater.