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Evaluation of Nitrification Inhibition Using Sequencing Batch Reactors and BioWin Modeling, and the Effect of Aqueous Film Forming Foam on Biological Nutrient Removal

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To evaluate nitrification inhibition at the HRSD Nansemond Wastewater Treatment Plant (NP), continuous sequencing batch reactors (SBRs) were run to simulate the full-scale plant. Four reactors were operated in this study:

Reactor A: Fed NP raw influent.

Reactor B: Fed NP Primary Clarifier Influent (includes raw influent, plant recycles, and septage, grease, and chemical toilet waste deliveries).

Reactor C&D: Fed raw influent from a treatment facility that achieves reliable nitrification yearround (VIP).

During SBR operation, there was no statistical difference between reactors A and B, and no signs of nitrification inhibition in either reactor when compared to the VIP control.

In a simultaneous study, reactor C was spiked with aqueous fire fighting foam (AFFF), while reactor D served as a control. The AFFF reactor experienced a complete loss of denitrification, while nitrification rates were unaffected. This result was unexpected, and is one of very few cases of selective denitrification inhibition.

Document Type: Research Article


Publication date: January 1, 2012

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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