Operational conditions for successful partial nitrification in a sequencing batch reactor (SBR) based on process kinetics

ABSTRACT

The objective of this study is to analyze the factors affecting the performance of partial nitrification in a sequencing batch reactor (SBR) using kinetic models. During the 4-month operation, dissolved oxygen (DO) and influent ammonia concentration were selected as operating variables to evaluate nitrite accumulation. Stable partial nitrification was observed with two conditions, influent ammonia concentration of 190 mg N/L and a DO of 0.6–3.0 mg/L as well as influent ammonia concentration of 100 mg N/L and a DO of 0.15–2.0 mg/L with intermittent aeration. At a DO of 0.6–3.0 mg O₂/L and influent ammonia concentration of 90 mg N/L, nitrite-oxidizing bacteria growth was not suppressed. Kinetic parameters were determined or estimated with batch tests and model simulation. The kinetic model predicted the SBR performance well.

KEYWORDS:

• Partial nitrification
• dissolved oxygen
• free ammonia
• kinetic analysis

ORCiD

Xiaoguang Liu http://orcid.org/0000-0003-2507-9061

Additional information

Funding

This work was supported by National Science and Engineering Research council of Canada [grant number CRDPJ 458990-13].