Nitrification/denitrification of real municipal wastewater in an intermittently aerated structured bed reactor

Correa, Camila Zoe; Prates, Kátia Valéria Marques Cardoso; Oliveira, Edson Fontes de; Lopes, Deize Dias; Barana, Ana Cláudia

doi:10.1016/j.jwpe.2018.03.013

Cited by 23 publications

(6 citation statements)

References 28 publications

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“…Similarly, Qiu et al (2019) performed experiments using landfill leachate wastewater in a bioreactor and reported an optimal aeration/mixing ratio of 0.5. According to Correa et al (2018), the optimal aeration/mixing ratio was 2 when treating municipal wastewater achieved an ammonium removal efficiency of 86%. Zhang et al (2011) treated swine wastewater using ICEAS at an aeration/mixing ratio of 2.08 and reported COD removal efficiencies >99%.…”

Section: Effect Of Aeration/mixing Ratiomentioning

confidence: 99%

Removal of Nutrients From Anaerobically Digested Swine Wastewater Using an Intermittent Cycle Extended Aeration System

2020

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Swine wastewater contains high concentrations of organic compounds, nutrients (nitrogen and phosphorus), heavy metals, and residual antibiotics, amongst others, that have negative impacts on the water environment. The main aim of this work was to remove nutrients from anaerobically digested swine wastewater using an intermittent cycle extended aeration system (ICEAS). The effects of operational parameters such as cycle time, organic loading rate, C/N ratio, and aeration/mixing ratio on the pollutant removal efficiencies of ICEAS were studied and compared with the performance of a conventional sequencing batch reactor (SBR). The following optimal conditions were obtained: cycle time, 6 h; organic loading rate, 0.86 kg COD m −3 day −1 ; C/N ratio, 2.49-2.82; and aeration/ mixing ratio, 1.57. The pH was maintained in the range of 6.0-8.0. The total organic carbon (TOC), total nitrogen (TN), ammonium (NH 4 +), total phosphorus (TP), and color removal efficiencies of ICEAS were higher than those of the conventional SBR, with removal

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Section: Effect Of Aeration/mixing Ratiomentioning

confidence: 99%

Removal of Nutrients From Anaerobically Digested Swine Wastewater Using an Intermittent Cycle Extended Aeration System

2020

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“…Correa et al. [ 1 ] stated that the best condition for NH 4 + ‐N and total Kjeldahl nitrogen (TKN) removal was achieved when the aeration/nonaearation (O/A) ratio was 2:1 and they obtained an 86% NH 4 + ‐N removal efficiency and 80% TKN removal efficiency under these conditions. A sufficient aerobic phase duration is required for the oxidation of NH 4 + ‐N by the nitrification process.…”

Section: Resultsmentioning

confidence: 99%

“…Wastewater is an important nitrogen source and the discharge of wastewater containing nitrogenous compounds to the receiving environment without any treatment or adequate treatment causes problems such as eutrophication, decrease in dissolved oxygen concentration, deterioration of water quality, fish deaths, and toxic effects on human or animal health. [ 1 ] The discharge standards of nitrogen are being tightened and nitrification and denitrification sequences are integrated into wastewater treatment plants to ensure these strict discharge standards. [ 2 ] In a sequencing batch reactor, nitrogen removal is carried out by providing a succession of an aerobic and an anoxic environment.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the efficiency of a three‐step fed anoxic/aerobic sequencing batch reactor using response surface methodology

Gürtekin

2023

CLEAN Soil Air Water

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In this study, the removal of chemical oxygen demand (COD), ammonium nitrogen (NH4+‐N) and total inorganic nitrogen (TIN) in a three‐step fed anoxic/aerobic sequencing batch reactor was investigated. Response surface methodology (RSM) was used to determine and optimize the effect of operating parameters such as the ratio of aerobic/anoxic (Ae/Ax) phase durations, percentage of feeding to the first anoxic phase (R1) and ratio of feeding percentages to the third and second anoxic phases (R3:R2). The results of the analysis of variance (ANOVA) showed that the three independent variables were statistically highly significant (p < 0.0001). The values of the determination coefficient (R2) for the removal efficiency of COD, NH4+‐N and TIN was 0.9558, 0.9334 and 0.9963, respectively, indicating a good agreement between the experimental results and the predicted values. The quadratic model was valid in predicting experimental results. The optimum conditions obtained using the desirability function were found to be 2.05 for the ratio of Ae/Ax phase durations, 43.09% for R1 and 0.86 for R3:R2, where the COD, NH4+‐N and TIN removal efficiency was 94.29, 97.83 and 86.86%, respectively. As a result of the evaluation of the interactive effect of the independent variables, it was determined that R1 was the most effective factor. The results showed that RSM could be used for optimization of operating parameters and improvement of efficiency in a three‐step fed anoxic/aerobic sequencing batch reactor.

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“…Bench-scale investigations have shown the potential of applying the structured bed reactors subjected to recirculation and intermittent aeration (SBRRIA) to remove organic matter and nitrogen compounds from different wastewaters (Almeida et al, 2018;Barana et al, 2013;Correa et al, 2018;Moura et al, 2012Moura et al, , 2018Santos et al, 2016Santos et al, , 2018Silva et al, 2018;Wosiack et al, 2015). In the structured bed reactor, the biofilm grows adhered to a polyurethane (PU) foam that serves as a support material.…”

Section: Introductionmentioning

confidence: 99%

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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Nitrification/denitrification of real municipal wastewater in an intermittently aerated structured bed reactor

Cited by 23 publications

References 28 publications

Removal of Nutrients From Anaerobically Digested Swine Wastewater Using an Intermittent Cycle Extended Aeration System

Removal of Nutrients From Anaerobically Digested Swine Wastewater Using an Intermittent Cycle Extended Aeration System

Optimizing the efficiency of a three‐step fed anoxic/aerobic sequencing batch reactor using response surface methodology

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

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