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Characteristics of Low-Oxygen Oxidation Ditch with Improved Nitrogen Removal

Department of Water Supply and Wastewater Treatment, Moscow State University of Civil Engineering (National Research University), 129337 Moscow, Russia
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Academic Editor: Antonio Zuorro
Water 2021, 13(24), 3603; https://doi.org/10.3390/w13243603
Received: 17 November 2021 / Revised: 8 December 2021 / Accepted: 13 December 2021 / Published: 15 December 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
This article presents a study on the operational stability of laboratory oxidation ditches, designated for synthetic and real wastewater and operable at low concentrations of dissolved oxygen. The project encompassed the stability monitoring of activated sludge depending on sedimentation characteristics and hydrobiological indicator microorganisms, determining (1) the size of sludge floccules and (2) the main functional groups of microorganisms identified in the course of the PCR analysis and reaction rates, plotted using the Michaelis–Menten enzymatic kinetics for the mixed culture biomass. The most stable system involves a bioreactor featuring dissolved oxygen gradients that range from 1.9 to 0.15 mg/L s, a specific organic load of 0.21 gBOD/g/d and a hydraulic retention time of 12 h. A built-in settling tank allows the consideration of the potential generation of large floccules of activated sludge in oxidation ditches (at least 300 μm) that increase the efficiency of simultaneous nitrification and denitrification. Thus, the obtained reaction rates can be used in calculations and simulations of the operation of oxidation ditches at low concentrations of dissolved oxygen. View Full-Text
Keywords: oxidation ditch; simultaneous nitrification and denitrification; Michaelis–Menten enzyme kinetics oxidation ditch; simultaneous nitrification and denitrification; Michaelis–Menten enzyme kinetics
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MDPI and ACS Style

Gogina, E.; Gulshin, I. Characteristics of Low-Oxygen Oxidation Ditch with Improved Nitrogen Removal. Water 2021, 13, 3603. https://doi.org/10.3390/w13243603

AMA Style

Gogina E, Gulshin I. Characteristics of Low-Oxygen Oxidation Ditch with Improved Nitrogen Removal. Water. 2021; 13(24):3603. https://doi.org/10.3390/w13243603

Chicago/Turabian Style

Gogina, Elena, and Igor Gulshin. 2021. "Characteristics of Low-Oxygen Oxidation Ditch with Improved Nitrogen Removal" Water 13, no. 24: 3603. https://doi.org/10.3390/w13243603

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