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Related Experiment Video

Updated: Jun 25, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation

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Published on: July 13, 2012

Innovative treatment system for digester liquor using anammox process.

Kenji Furukawa¹, Yasuhiko Inatomi, Sen Qiao

¹Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan. k-furu@gpo.kumamoto-u.ac.jp

Bioresource Technology

|February 10, 2009

Summary

This study shows that polyethylene glycol (PEG) gel carriers effectively treat biogas digester liquor using partial nitritation and anammox processes, removing high ammonium concentrations efficiently.

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Area of Science:

Environmental biotechnology
Wastewater treatment
Microbial processes

Background:

Biogas plants produce high-strength ammonium wastewater.
Conventional treatment methods can be inefficient or costly.
Developing effective pretreatment methods is crucial for nutrient recovery.

Purpose of the Study:

To evaluate the efficacy of partial nitritation and anammox processes using polyethylene glycol (PEG) gel carriers for treating biogas digester liquor.
To determine optimal nitrogen loading rates and assess the impact of influent characteristics on treatment performance.

Main Methods:

Utilized nitrifying activated sludge and anammox bacteria immobilized in PEG gel carriers.
Applied partial nitritation as a pretreatment step followed by an anammox process.
Operated reactors at a nitrogen loading rate of 3.0 kg-N/m(3)/d for nitritation and >4.0 kg-N/m(3)/d for anammox.

Main Results:

Partial nitritation achieved a suitable NO(2)-N/NH(4)-N ratio (1.0-1.4) for anammox.
High suspended solids (SS) and biochemical oxygen demand (BOD) did not inhibit treatment performance.
Achieved total nitrogen (T-N) removal rates exceeding 4.0 kg-N/m(3)/d in the anammox stage.

Conclusions:

PEG-entrapped bacteria offer an effective solution for high-ammonium wastewater treatment.
The combined partial nitritation-anammox process is robust and efficient for biogas plant effluent.
This approach facilitates nutrient recovery and enhances biogas plant sustainability.