Aeration and non-aeration cycles (AE/NA) time: influence in combined organic matter and nitrogen removal and features of biofilm

Azevedo, Camila Souza; Correa, Camila Zoe; Lopes, Deize Dias; Pescim, Rodrigo R.; Prates, Kátia Valéria Marques Cardoso; Barana, Ana Cláudia

doi:10.1080/09593330.2021.1882583

Cited by 6 publications

(4 citation statements)

References 60 publications

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“…The nitrification may be restrained in DO levels varying between 0.5 and 2.5 mgO2 L -1 (EPA, 1993), and Water Environment Federation (WEF) et al ( 2006) recommend values wider than 2.0 mgO2 L -1 for full nitrification in WWTPs. Oxygen as a limiting factor for nitrification was also observed in moving bed biofilm reactors (MBBRs) operated on bench-and pilot-scales (Hem et al, 1994) and in a SBRRIA treating sewage (Azevedo et al, 2021). In both studies, the nitrification loss was related to the DO consumption by the heterotrophs, which consequently suppressed the activity of the nitrifying bacteria (Azevedo et al, 2021;Hem et al, 1994).…”

Section: Cod and Nitrogen Removalmentioning

confidence: 93%

“…Oxygen as a limiting factor for nitrification was also observed in moving bed biofilm reactors (MBBRs) operated on bench-and pilot-scales (Hem et al, 1994) and in a SBRRIA treating sewage (Azevedo et al, 2021). In both studies, the nitrification loss was related to the DO consumption by the heterotrophs, which consequently suppressed the activity of the nitrifying bacteria (Azevedo et al, 2021;Hem et al, 1994). In fact, the average DO concentration in Stage 3 was the minimal (1.0 ± 0.6 mg O2 L -1 ) recorded by the DO sensor (Table 3).…”

Section: Cod and Nitrogen Removalmentioning

confidence: 95%

“…Therefore, aerobic heterotrophs, nitrifying and denitrifying bacteria can coexist in the biofilm. Intermittent aeration is used to balance the amount of oxygen available in the system and to ensure organic matter availability for denitrification over aerobic growth (Azevedo et al, 2021;Moura et al, 2018). In most bench-scale studies, high total-N and COD removal efficiencies were attained (Barana et al, 2013;Moura et al, 2012Moura et al, , 2018Santos et al, 2016;Silva et al, 2021;Wosiack et al, 2015), resulting in final effluents compatible with disposal requirements established by Brazilian guidelines (CONAMA Resolutions No.…”

Section: Introductionmentioning

confidence: 99%

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Pilot-scale study of a structured bed reactor for nitrogen and organic matter removal from sanitary sewage: advances and design challenges

Murata¹,

Silva

Santos

et al. 2021

RSD

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Simultaneous nitrification and denitrification (SND) is a process that can remove both nitrogen and organic matter in a single unit. Several bench-scale studies show that the structured bed reactors (STBR) subjected to recirculation and intermittent aeration have achieved a good performance for SND treating different types of wastewater. Thus, this study took a step forward and evaluated the efficiency and stability of treating domestic sewage in a pilot-scale STBR. COD removal efficiencies higher than 87% were achieved in the whole experimental period. The highest Total-N removal efficiency was approximately 74 ± 7% by adopting a hydraulic retention time (HRT) of 47.2 h and intermittent aeration (2 h aerated and 1 h non-aerated). The setup of the aeration system was an important mechanism to ensure the optimal balance between nitrification and denitrification in a pilot-scale system.

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Section: Cod and Nitrogen Removalmentioning

confidence: 93%

Section: Cod and Nitrogen Removalmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pilot-scale study of a structured bed reactor for nitrogen and organic matter removal from sanitary sewage: advances and design challenges

Murata¹,

Silva

Santos

et al. 2021

RSD

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“…Regarding amoebas, thecamoebas were seen in abundance in relation to other microorganisms, present in sludges with low organic load, with nitrogen removal, and with high available oxygen content (MADONI, 1994;AZEVEDO et al, 2022).…”

Section: A B Cmentioning

confidence: 99%

Microfauna in the activated sludge treatment of the effluent from a soybean processing industry: a form of evaluation and control of the process

Seidel

Carli

Santos³

et al. 2023

Eng. Sanit. Ambient.

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Wastewater treatment system by activated sludge, the purification of the organic matter by specific heterogeneous microorganisms, occurs in the presence of oxygen in aeration tanks. The analysis of the microfauna present in the sludge is an important indicator of the performance and efficiency of the activated sludge system. Considering this importance, the objective of this work was to identify the microorganisms which are part of the microfauna present in the aeration tank of the effluent treatment plant of a soybean processing industry in the state of Mato Grosso, evaluating the biological activity of the sludge and the efficiency of the process. Protozoa and bacteria were identified through electronic microscopy and physical-chemical analyses such as pH, dissolved oxygen, nitrogen, phosphorus, BOD, COD, suspended solids, and SVI. During the study, it was possible to identify bacteria related to flake formation, organic matter degradation, nitrification and denitrification, and also microorganisms such as thecamoebas, micrometazoa, fixed ciliates and ciliates free natantes, characterizing the process with good purification and the structure of the sludge flakes between ideal and filamentous bulking with a high sludge age. The identification of the microfauna present was efficient as a bioindicator of the treatment system condition with removal of BOD and COD of 59.75 and 67.09%, respectively.

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Removal of organic matter and nitrogen from dairy effluents in a structured bed reactor operated with intermittent aeration

Correa

Bolonhesi

Lopes

et al. 2023

Environ Sci Pollut Res

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Aeration and non-aeration cycles (AE/NA) time: influence in combined organic matter and nitrogen removal and features of biofilm

Cited by 6 publications

References 60 publications

Pilot-scale study of a structured bed reactor for nitrogen and organic matter removal from sanitary sewage: advances and design challenges

Pilot-scale study of a structured bed reactor for nitrogen and organic matter removal from sanitary sewage: advances and design challenges

Microfauna in the activated sludge treatment of the effluent from a soybean processing industry: a form of evaluation and control of the process

Removal of organic matter and nitrogen from dairy effluents in a structured bed reactor operated with intermittent aeration

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