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Denitrification: Sampling, Modeling, Design and Operational Considerations

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Abstract:

Recent nutrient reduction initiatives and the need to achieve limit-of-technology (LOT) effluent quality have renewed interest in denitrification research. Since readily-biodegradable chemical oxygen demand (rbCOD) drives rapid denitrification, it is essential for design efforts to include thorough raw influent and primary effluent sampling. However, the influent rbCOD/TKN ratio is not the only factor to consider, since rbCOD can be easily destroyed by non-optimal design and operating conditions. Two case studies are presented, each having very similar influent rbCOD/TKN ratios but different full-scale denitrification performance. Furthermore, benchscale tests that were conducted for the two plants yielded similar denitrification rates, which raises the question: how can engineers apply denitrification rate research to full-scale designs? Activated sludge models provide some insight but cannot predict rbCOD destruction due to hydraulic conditions, or fermentation due to heterogeneous mixing. This paper discusses all of the factors that affect denitrification and poses questions for future research.

Keywords: Denitrification rate; anoxic zone; design; modeling; sampling

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864710798194148

Publication date: January 1, 2010

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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 These proceedings are not peer reviewed.

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