Nitrogen removal with SBR-NAS technology – Qingdao

ATAL Engineering (Shanghai) Ltd
Qingdao, China

Influent: 1,200 m³/day


Influent N-total: 1,200 mg N/l


Influent NH4-N: 1,000 mg NH4-N/l


SBR-NAS tank volume: 3,000 m³


Batch volume: 700 m³


Effluent N-total: 240 mg N/l


Effluent NH4-N: 100 mg NH4-N/l



Side-stream treatment

In Qindao, China, you will find one of the world’s largest anammox reactors used for water treatment. Together with its Chinese partner ATAL Engineering, Colsen helped build and start up this reactor, focussing on side-stream treatment. This involves processing liquid effluent from the sludge digestion process, greatly reducing the burden on the main stream. The reactor design is based on Colsen’s proprietary SBR-NAS® technology.

Consultancy & training

Reinforced by ATAL Engineering’s expertise, the technological design was realised in practice, after which Colsen supervised the commissioning process and trained the operators of the SBR-NAS® system on site. Colsen contributed to the project by consulting on the technological/technical design and by starting up a side-stream treatment system, aimed at processing the liquid fraction of the sludge digestion process in order to reduce the load on the waterline in the main stream. On top of that, Colsen trained the operators of the SBR-NAS® system on site.

Applied technology

Nitrogen removal with SBR-NAS

The sequential batch reactor (SBR) is a single-stage system in which aerobic and anoxic steps alternate, resulting in a high degree of operational flexibility and a small footprint. The SBR-NAS® uses anammox bacteria for low-sludge, energy-efficient nitrogen removal.

Qingdao gebouw
Qingdao installatie
Qingdao installatie

Would you like to know more?
Ask Robin

Robin Jordaens , Technologist / Process Engineer