The influence of solid retention time on IFAS-MBR systems: Assessment of nitrous oxide emission

Mannina, Giorgio; Capodici, Marco; Cosenza, Alida; Laudicina, Vito Armando; Trapani, Daniele Di

doi:10.1016/j.jenvman.2017.08.011

Cited by 13 publications

(2 citation statements)

References 34 publications

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“…This can avoid the high N2O emissions in suspended growth systems transitioning from anoxic to aerobic zones (Chandran et al 2011). Recent research on N2O emissions from MBBRs are consistent with the factors described at the beginning of this section, depending on the application (Mannina et al 2018a;Mannina et al 2017;Mannina et al 2018b;Wei et al 2017).…”

Section: Figuresupporting

confidence: 77%

Nitrous oxide emissions from biofilm processes for wastewater treatment

Sabba

Terada

Wells

et al. 2018

Appl Microbiol Biotechnol

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This paper discusses the microbial basis and the latest research on nitrous oxide (NO) emissions from biofilms processes for wastewater treatment. Conditions that generally promote NO formation in biofilms include (1) low DO values, or spatial DO transitions from high to low within the biofilm; (2) DO fluctuations within biofilm due to varying bulk DO concentrations or varying substrate concentrations; (3) conditions with high reaction rates, which lead to greater formation of intermediates, e.g., hydroxylamine (NHOH) and nitrite (NO), that promote NO formation; and (4) electron donor limitation for denitrification. Formation of NO directly results from the activities of ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), and heterotrophic denitrifying bacteria. More research is needed on the roles of AOA, comammox, and specialized denitrifying microorganisms. In nitrifying biofilms, higher bulk ammonia (NH) concentrations, higher nitrite (NO) concentrations, lower dissolved oxygen (DO), and greater biofilm thicknesses result in higher NO emissions. In denitrifying biofilms, NO accumulates at low levels as an intermediate and at higher levels at the oxic/anoxic transition regions of the biofilms and where COD becomes limiting. NO formed in the outer regions can be consumed in the inner regions if COD penetrates sufficiently. In membrane-aerated biofilms, where nitrification takes place in the inner, aerobic biofilm region, the exterior anoxic biofilm can serve as a NO sink. Reactors that include variable aeration or air scouring, such as denitrifying filters, trickling filters, or rotating biological contactors (RBCs), can form peaks of NO emissions during or following a scouring or aeration event. NO emissions from biofilm processes depend on the microbial composition, biofilm thickness, substrate concentrations and variability, and reactor type and operation. Given the complexity and difficulty in quantifying many of these factors, it may be difficult to accurately predict emissions for full-scale treatment plants. However, a better understanding of the mechanisms and the impacts of process configurations can help minimize NO emission from biofilm processes for wastewater treatment.

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Section: Figuresupporting

confidence: 77%

Nitrous oxide emissions from biofilm processes for wastewater treatment

Sabba

Terada

Wells

et al. 2018

Appl Microbiol Biotechnol

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“…The IFAS-MBR provides advanced treatment and high-quality effluent but requires a higher capital investment. Careful consideration of these performance aspects is essential in choosing the optimal process for a specific wastewater treatment application [ 55 , 131 ].…”

Section: Comparison Of Asp Ifas and Ifas-mbrmentioning

confidence: 99%

Effect of Operating Parameters on the Performance of Integrated Fixed-Film Activated Sludge for Wastewater Treatment

Waqas,

Harun,

Sambudi

et al. 2023

Membranes

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Integrated fixed-film activated sludge (IFAS) is a hybrid wastewater treatment process that combines suspended and attached growth. The current review provides an overview of the effect of operating parameters on the performance of IFAS and their implications for wastewater treatment. The operating parameters examined include hydraulic retention time (HRT), solids retention time (SRT), dissolved oxygen (DO) levels, temperature, nutrient loading rates, and aeration. Proper control and optimization of these parameters significantly enhance the treatment efficiency and pollutant removal. Longer HRT and appropriate SRT contribute to improved organic matter and nutrient removal. DO levels promote the growth of aerobic microorganisms, leading to enhanced organic matter degradation. Temperature influences microbial activity and enzymatic reactions, impacting treatment efficiency. Nutrient loading rates must be carefully managed to avoid system overload or inhibition. Effective aeration ensures uniform distribution of wastewater and biofilm carriers, optimizing contact between microorganisms and pollutants. IFAS has been used in water reuse applications, providing a sustainable and reliable water source for non-potable uses. Overall, IFAS has proven to be an effective and efficient treatment process that can provide high-quality effluent suitable for discharge or reuse. Understanding the effects of these operating parameters helps to optimize the design and operation for efficient wastewater treatment. Further research is needed to explore the interactions between different parameters, evaluate their impact under varying wastewater characteristics, and develop advanced control strategies for improved performance and sustainability.

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Impact of influent characteristics and operational parameters on nitrous oxide emissions in wastewater treatment: Strategies for mitigation and microbial insights

Zhao,

Du,

et al. 2024

Current Research in Biotechnology

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The influence of solid retention time on IFAS-MBR systems: Assessment of nitrous oxide emission

Cited by 13 publications

References 34 publications

Nitrous oxide emissions from biofilm processes for wastewater treatment

Nitrous oxide emissions from biofilm processes for wastewater treatment

Effect of Operating Parameters on the Performance of Integrated Fixed-Film Activated Sludge for Wastewater Treatment

Impact of influent characteristics and operational parameters on nitrous oxide emissions in wastewater treatment: Strategies for mitigation and microbial insights

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