Start-up strategies to develop aerobic granular sludge and photogranules in sequential batch reactors

Sales, Marcos; Marinho, Talita; Marinho, Idayana C.; Gavazza, Sávia; Kato, Mário T.; Magnus, Bruna Scandolara; Florêncio, Lourdinha

doi:10.1016/j.scitotenv.2022.154402

Cited by 15 publications

(1 citation statement)

References 39 publications

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“…So far, most of the research has focussed on photogranule initiation and microbial community assembly (Abouhend et al, 2020; Ansari et al, 2021; Ji et al, 2020; Safitri et al, 2021; Sales et al, 2022; Volkova et al, 2020; Zhu et al, 2023). Little is known about the effect of varying wastewater characteristics, and so far, there are no studies on nitrogen limitation.…”

Section: Introductionmentioning

confidence: 99%

N₂‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions

Trebuch

Schoofs

Vaessen

et al. 2023

Biotech & Bioengineering

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Wastewater characteristics can vary significantly, and in some municipal wastewaters the N:P ratio is as low as 5 resulting in nitrogen-limiting conditions. In this study, the microbial community, function, and morphology of photogranules under nitrogen-replete (N+) and limiting (N−) conditions was assessed in sequencing batch reactors. Photogranules under N− condition were nitrogen deprived 2/3 of a batch cycle duration. Surprisingly, this nitrogen limitation had no adverse effect on biomass productivity. Moreover, phosphorus and chemical oxygen demand removal were similar to their removal under N+ conditions. Although performance was similar, the difference in granule morphology was obvious. While N+ photogranules were dense and structurally confined, N− photogranules showed loose structures with occasional voids. Microbial community analysis revealed high abundance of cyanobacteria capable of N 2 -fixation. These were higher at N− (38%) than N+ (29%) treatments, showing that photogranules could adjust and maintain treatment performance and high biomass productivity by means of N 2 -fixation.

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Section: Introductionmentioning

confidence: 99%

N₂‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions

Trebuch

Schoofs

Vaessen

et al. 2023

Biotech & Bioengineering

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Assessment of the oxygen dynamics in microalgae–bacteria systems through respirometry

Sales,

Florêncio,

Buitrón

2024

J of Chemical Tech & Biotech

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BACKGROUNDA microalgae–bacteria consortium applied to the treatment of domestic wastewater can be an alternative to reduce the energy consumption of aerobic systems if the algal biomass produces enough oxygen for bacterial consumption. This study proposed to evaluate the microalgal production of photosynthetic O2 and consumption by heterotrophic organic matter‐removing and autotrophic nitrifying bacteria through respirometric tests.RESULTSAggregates composed of predominantly spherical green microalgae and bacteria were formed in a photosequencing batch reactor, with 6 h cycles, and fed with synthetic domestic wastewater. Biomass reached 800 mgVSS L−1 and chlorophyll‐a content of 4 mg gVSS−1. Photosynthetic oxygen production reached 33.4 mgO2 gSS−1 h−1. Through respirometric tests and oxygen mass balance, oxygen consumption rates by ordinary heterotrophic bacteria (5.9 mgO2 gSS−1 h−1), ammonia‐oxidizing bacteria (8.67 mgO2 gSS−1 h−1) and nitrite‐oxidizing bacteria (0.78 mgO2 gSS−1 h−1) were obtained.CONCLUSIONPhotosynthetic oxygen production was 28% higher than the total O2 required by bacteria. Under the conditions studied, an artificial oxygen supply would not be necessary since the algal biomass can supply the bacterial O2 demand. © 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Formation characteristics of algal-bacteria granular sludge under low-light environment: From sludge characteristics, extracellular polymeric substances to microbial community

Liu

Wang

Zhang

et al. 2023

Bioresource Technology

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Start-up strategies to develop aerobic granular sludge and photogranules in sequential batch reactors

Cited by 15 publications

References 39 publications

N₂‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions

N₂‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions

Assessment of the oxygen dynamics in microalgae–bacteria systems through respirometry

Formation characteristics of algal-bacteria granular sludge under low-light environment: From sludge characteristics, extracellular polymeric substances to microbial community

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Start-up strategies to develop aerobic granular sludge and photogranules in sequential batch reactors

Cited by 15 publications

References 39 publications

N2‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions

N2‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions

Assessment of the oxygen dynamics in microalgae–bacteria systems through respirometry

Formation characteristics of algal-bacteria granular sludge under low-light environment: From sludge characteristics, extracellular polymeric substances to microbial community

Contact Info

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N₂‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions

N₂‐fixation can sustain wastewater treatment performance of photogranules under nitrogen‐limiting conditions