Pilot-scale investigation on the feasibility of simultaneous nitrification and denitrification (SND) in a continuous flow single-stage membrane bioreactor

Subtil, Eduardo Lucas; Silva, Marina Victoretti; Lotto, Bruna Araújo; Domingues, Mércia Regina; Mierzwa, José Carlos

doi:10.1016/j.jwpe.2019.100995

Cited by 23 publications

(6 citation statements)

References 41 publications

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“…Nevertheless, the lack of obvious nitrite accumulation in the effluent indicated that complete nitrification occurred in the reactors even under the relatively low DO conditionse.g., in R1 and R2. Several studies show that continuous aeration is helpful to complete nitrification acclimation (Boog et al 2018;Hou et al 2018;Chai et al 2019) even under low DO conditions (Subtil et al 2019), which accords with the present study. Complete nitrification was also demonstrated by the obvious nitrate accumulation at 3 to 5 mg/L DO levels (Figure 2(b)).…”

Section: Comparison Of Treatment Performancesupporting

confidence: 93%

“…Zhang et al (2020b) reported that the SND rate achieved a maximum of 92.3% in an aerobic biofilm system at a DO of 2 mg/L, when treating real industrial/domestic wastewater. Subtil et al (2019) found that TN removal achieved a maximum of 66% in a single-stage membrane bioreactor at a DO of 0.8 + 0.1 mg/L. However, there is still little information about the response of SND rate to different DO levels in biofilm reactors for the treatment of highstrength aquaculture wastewater.…”

Section: Introductionmentioning

confidence: 99%

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Response of simultaneous nitrification-denitrification to DO increments in continuously aerated biofilm reactors for aquaculture wastewater treatment

Zhang

Chen

Yuan

et al. 2021

Water Practice and Technology

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Intensive aquaculture usually produces large volumes of nutrient-rich wastewater, which is essential to treat to avoid eutrophication. This study aimed to evaluate the performance of five, continuously aerated, biofilm reactors treating simulated, high-strength, aquaculture wastewater under different dissolved oxygen (DO) levels, and the effects of DO increments on simultaneous nitrification-denitrification (SND). Continuous aeration was beneficial to complete nitrification. Total inorganic nitrogen (TIN), principally ammonium, was mainly removed by SND. The SND rate response to different DO levels was fitted well by the power function of y = 54.81 + 371.58/(1 − 0.16*x)^(−1/0.24) (R2 = 0.897, P = 0.000). When the TIN was removed completely, the optimal SND rate was defined and corresponded to a value of 121.8%. Accordingly, the optimal DO concentration was calculated as 2.10 mg/L, close to the actual level of 1.83 mg/L, at which the highest proportional removals of total nitrogen (58.0%) and TIN (57.3%) were obtained. Phosphorus was also removed by denitrifying polyphosphate-accumulating organisms.

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Section: Comparison Of Treatment Performancesupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Response of simultaneous nitrification-denitrification to DO increments in continuously aerated biofilm reactors for aquaculture wastewater treatment

Zhang

Chen

Yuan

et al. 2021

Water Practice and Technology

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“…O efluente utilizado neste trabalho é oriundo de um sistema de tratamento piloto composto de tratamento preliminar com grade mecanizada e caixa de areia para a remoção de sólidos grosseiros, transferência a um tanque de equalização (1.000 L) e tratamento em um MBR aeróbio em escala piloto, o mesmo Pós-tratamento de efluente de biorreator com membranas submersas por coagulação/floculação usado por Subtil et al (2019) e Moyano, Delforno e Subtil (2021). O efluente foi coletado do tanque de permeado desse reator.…”

Section: Efluente Utilizadounclassified

“…Entretanto, o permeado produzido pelo sistema SMBR é praticamente isento de sólidos em suspensão (LEMOS et al, 2021;SUBTIL;HESPANHOL;MIERZWA, 2013) e possui compostos orgânicos dissolvidos de baixo peso molecular (CHON et al, 2016), o que pode comprometer a remoção de cor verdadeira e fósforo pelo processo de coagulação/floculação. Isso porque a baixa concentração de partículas reduz as taxas de colisão responsáveis pela formação de flocos, com consequente redução dos efeitos dos mecanismos de floculação por varredura e adsorção (CHENG et al, 2008;LIU et al 2019;SHAMMAS, 2005).…”

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Pós-tratamento de efluente de biorreator com membranas submersas por coagulação/floculação: remoção de cor, matéria orgânica e fósforo

Silva

Ragio

Arantes

et al. 2022

Eng. Sanit. Ambient.

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RESUMO Biorreatores com membranas submersas (MBR) produzem efluente de elevada qualidade, porém, para algumas situações de reúso de água ou lançamento em corpos hídricos, ainda pode ser necessária a remoção adicional de coloides e fósforo. Neste estudo, foram avaliadas as eficiências de remoção de cor verdadeira, matéria orgânica e fósforo do efluente de sistema MBR, que tratava esgoto doméstico da moradia estudantil e do restaurante da Universidade São Paulo, por meio de método físico-químico (coagulação/floculação). Em todos os testes, observou-se eficiência de 17 a 35% para remoção de cor verdadeira, com menor remoção na presença do floculante. Por outro lado, não houve remoção de matéria orgânica medida como carbono orgânico dissolvido (COD), o que sugere que a baixa concentração de material particulado no permeado do MBR e as dosagens utilizadas não tenham permitido a formação de flocos que fossem capazes de remover tais compostos. A remoção de fósforo foi superior a 90% em todos os ensaios, resultando em um efluente com concentração residual entre 0,2 e 0,4 mgP.L-1, mesmo com a menor razão molar de metal do coagulante por concentração de fósforo. Os resultados mostram que a aplicação de coagulante em efluente de sistema MBR requer dosagens significativamente menores, em até três vezes, do que a aplicação direta no licor misto (biomassa suspensa no tanque aeróbio), sendo, portanto, uma estratégia atrativa para a redução dos custos relacionados com o uso de coagulantes para a remoção de fósforo e cor.

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“…Bacillus subtilis is one of the most commonly used and characteristic microbial ecological agents (Shao et al 2020). This bacterium mainly exists as a spore, with high stability, stress resistance and antibacterial activity (Pepi et al 2016, Subtil et al 2019). B. subtilis can secrete multiple exoenzymes, including protease, lipase, cellulase and soft phospholipase (Lu et al 2018, Cho et al 2019, which may improve water quality, and can inhibit the growth and reproduction of harmful microbes.…”

Section: Introductionmentioning

confidence: 99%

Use of Bacillus subtilis D9 to purify coastal aquaculture wastewater and improve grass carp resistance to Vibrio infection

Shao

Zhong

Wang

et al. 2021

Aquacult. Environ. Interact.

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In coastal areas of China, high-density aquaculture has caused environmental problems and fish health concerns. Bacillus subtilis D9 is a new strain isolated from coastal soils which could be used in aquaculture to improve the water environment. We investigated the effect of B. subtilis D9 on the purification of coastal aquaculture wastewater and the resistance of grass carp Ctenopharyngodon idellus to pathogenic Vibrio infection. Three inoculation levels of B. subtilis D9 were used (5.5 × 107, 5.5 × 108 and 5.5×109 cfu ml-1 as BD7, BD8 and BD9, respectively), together with sterilized saline water without B. subtilis D9 as the Control. B. subtilis D9 at the inoculation level of BD8 showed the best performance with 81, 87, 91, 52 and 86% removal of NH4+-N, NO3--N, total nitrogen (TN), NO2--N and turbidity, respectively, after 25 d of treatment. These values were significantly higher than at the BD7, BD9 and Control levels. Under aeration (AIR) conditions, B. subtilis D9 at the inoculation level of BD8 showed removal efficiency of 93, 91, 95, 76 and 89%, respectively. In contrast it was only 26, 29, 16, 10 and 57% in an inactivated bacteria liquid (IBL) treatment. After 22 d of infection by Vibrio parahaemolyticus, significant differences were found in weight gain, specific growth rate and relative percentage of survival among grass carp grown on AIR, BD8 or IBL wastewater. In summary, B. subtilis D9 with aeration has beneficial effects on the purification of coastal aquaculture wastewater and on the resistance of grass carp to disease caused by V. parahaemolyticus.

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Pilot-scale investigation on the feasibility of simultaneous nitrification and denitrification (SND) in a continuous flow single-stage membrane bioreactor

Cited by 23 publications

References 41 publications

Response of simultaneous nitrification-denitrification to DO increments in continuously aerated biofilm reactors for aquaculture wastewater treatment

Response of simultaneous nitrification-denitrification to DO increments in continuously aerated biofilm reactors for aquaculture wastewater treatment

Pós-tratamento de efluente de biorreator com membranas submersas por coagulação/floculação: remoção de cor, matéria orgânica e fósforo

Use of Bacillus subtilis D9 to purify coastal aquaculture wastewater and improve grass carp resistance to Vibrio infection

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