Hydrodynamic Characteristics of a Structured Bed Reactor Subjected to Recirculation and Intermittent Aeration (Sbrria)

Moura, Rafael de Deus; Damasceno, Leonardo Henrique Soares; Damianovic, Márcia Helena Rissato Zamariolli; Zaiat, Marcelo; Foresti, Eugênio

doi:10.1590/0104-6632.20180352s20160516

Cited by 5 publications

(1 citation statement)

References 15 publications

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“…Essa estratégia consiste em desligar a aeração por um periodo de tempo (de 30 minutos a 3 horas). Uma linha de recirculação garante as condições de mistura no reator e qualidade do efluente constante (Moura et al, 2016).…”

Section: Nds Em Reatores De Espuma De Poliuretano Como Materials Suporteunclassified

Reator de biofilme fixo aerado submetido à contra-difusão de aceptores e doadores de elétrons para remoção de compostos nitrogenados

Silva¹

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A novel foam aerated biofilm reactor (FABR) was evaluated to remove nitrogen and COD from synthetic wastewater. This new reactor configuration establishes a counter-diffusion biofilm like the well-known membrane aerated bioreactor (MABR), however using polyurethane foam as the support material and aeration system by air diffuser. It is especially well suited for wastewaters with low COD/N ratios. In FABR, a polyurethane foam sheet separates the aerobic compartment, which received the aeration, and the anoxic compartment, which received the effluent. Foams sheets with thicknesses of 10, 5 and 2 mm and synthetic wastewater with COD/N ratios of 5 and 2.5 were evaluated. The 2 mm thick foam reactor did not show good biomass adherence and, therefore, did not show N removal efficiency. The 5 and 10 mm reactors, in both COD/N ratios, showed an average total nitrogen removal efficiency from 36 to 46%. The denitrification efficiency was 100% throughout the experimental period.Lower values of polyurethane foam thickness and COD/N ratio did not provide a higher nitrification rate, as expected. Throughout the operation, biomass growth was associated with a decrease in nitrification efficiency, which was restored after biomass removal. It was concluded that the greatest limitation of the system is associated with mass transfer resistance in the biofilm and not with the thickness of the foam layer. The increase in this resistance occurred due to the biomass growth inside the foam, leading to pore clogging and creating barriers to efficient mass transport. A mathematical model was developed to describe the mass transport in the foam. The effective diffusivity and porosity of the biofilm were determined experimentally and incorporated into the model. The value of the effective diffusivity proved to be more significant for the results of the model. Gradients of oxygen, nitrate, nitrite and ammonia concentration through the biofilm were measured using microsensors and compared with the values calculated by the model. It was concluded that the foam fiber and bacterial cell complex can be considered as a biofilm, as long as it is considered adequate effective diffusivity, which depends on biomass growth within the foam pores.

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Section: Nds Em Reatores De Espuma De Poliuretano Como Materials Suporteunclassified

Reator de biofilme fixo aerado submetido à contra-difusão de aceptores e doadores de elétrons para remoção de compostos nitrogenados

Silva¹

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Enhanced biological nitrogen and phosphorus removal from sewage driven by fermented glycerol: comparative assessment between sequencing batch- and continuously fed-structured fixed bed reactor

Lopes

Silva

Dias

et al. 2022

Environ Sci Pollut Res

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Structured-bed reactor with intermittent aeration and recirculation (SBRRIA) for treating UASB effluent combined with raw sewage

Wendling

Oliveira

Jenzura

et al. 2022

Int. J. Environ. Sci. Technol.

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Hydrodynamic Characteristics of a Structured Bed Reactor Subjected to Recirculation and Intermittent Aeration (Sbrria)

Cited by 5 publications

References 15 publications

Reator de biofilme fixo aerado submetido à contra-difusão de aceptores e doadores de elétrons para remoção de compostos nitrogenados

Reator de biofilme fixo aerado submetido à contra-difusão de aceptores e doadores de elétrons para remoção de compostos nitrogenados

Enhanced biological nitrogen and phosphorus removal from sewage driven by fermented glycerol: comparative assessment between sequencing batch- and continuously fed-structured fixed bed reactor

Structured-bed reactor with intermittent aeration and recirculation (SBRRIA) for treating UASB effluent combined with raw sewage

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