This article presents the results of an experimental study on the correlation among the specific denitrification rate (SDNR), the dissolved oxygen concentration (DO), the F:M ratio (F:M) and the mixed-liquor (ML) recycle in the pre-denitrification reactors fed by domestic sewage. The experimental curves reveal a 28.8-32.0% reduction in the SDNR at 20°C () with DO equal to 0.1 mgO 2 L-1 and F:M in the range 0.2-0.4 kgBOD5 kgMLVSS-1 d-1. The SDNR reduction increases to 50.0-55.9% with DO=0.3 mgO2 L-1. A mathematical correlation of these results and an equation for calculating as function of the F:M as well as the average DO and BOD5 in the total flow rate fed in the denitrification stage are proposed. The conducted experience gives useful suggestions for practical usage, in particular regarding the denitrification reactor design, and represents a good starting point for future applications with the aim to optimize the biological process in domestic sewage treatment plants. © 2014 Taylor & Francis.

Calculating specific denitrification rates in pre-denitrification by assessing the influence of dissolved oxygen, sludge loading and mixed-liquor recycle / Massimo, Raboni; Vincenzo, Torretta; Viotti, Paolo; Giordano, Urbini. - In: ENVIRONMENTAL TECHNOLOGY. - ISSN 0959-3330. - STAMPA. - 35:20(2014), pp. 2582-2588. [10.1080/09593330.2014.913690]

Calculating specific denitrification rates in pre-denitrification by assessing the influence of dissolved oxygen, sludge loading and mixed-liquor recycle

VIOTTI, Paolo;
2014

Abstract

This article presents the results of an experimental study on the correlation among the specific denitrification rate (SDNR), the dissolved oxygen concentration (DO), the F:M ratio (F:M) and the mixed-liquor (ML) recycle in the pre-denitrification reactors fed by domestic sewage. The experimental curves reveal a 28.8-32.0% reduction in the SDNR at 20°C () with DO equal to 0.1 mgO 2 L-1 and F:M in the range 0.2-0.4 kgBOD5 kgMLVSS-1 d-1. The SDNR reduction increases to 50.0-55.9% with DO=0.3 mgO2 L-1. A mathematical correlation of these results and an equation for calculating as function of the F:M as well as the average DO and BOD5 in the total flow rate fed in the denitrification stage are proposed. The conducted experience gives useful suggestions for practical usage, in particular regarding the denitrification reactor design, and represents a good starting point for future applications with the aim to optimize the biological process in domestic sewage treatment plants. © 2014 Taylor & Francis.
2014
plant design; nitrogen control; denitrification rate; wastewater treatment; mathematical correlation; conversion yield; plant design wastewater treatment
01 Pubblicazione su rivista::01a Articolo in rivista
Calculating specific denitrification rates in pre-denitrification by assessing the influence of dissolved oxygen, sludge loading and mixed-liquor recycle / Massimo, Raboni; Vincenzo, Torretta; Viotti, Paolo; Giordano, Urbini. - In: ENVIRONMENTAL TECHNOLOGY. - ISSN 0959-3330. - STAMPA. - 35:20(2014), pp. 2582-2588. [10.1080/09593330.2014.913690]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/574379
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