Mechanism of biofouling enhancement in a membrane bioreactor under constant trans-membrane pressure operation

Hong, Phuc-Nguon; Noguchi, Midori; Matsuura, Norihisa; Honda, Ryo

doi:10.1016/j.memsci.2019.117391

Cited by 25 publications

(2 citation statements)

References 39 publications

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“…However, mitigation of planktonic cells in MBR sludge is not a straightforward task due to the nature of membrane technologies—all particular components are held back. Operation at lower TMP and higher hydraulic retention time (HRT) is generally recommended to avoid severe fouling caused by soluble EPS (Hamedi et al, 2019), whereas constant and high TMP accumulates the colloid‐like free cells and shows severe fouling (Hong, Noguchi, Matsuura, & Honda, 2019) and should therefore be avoided. Data indicate that SRT is important for the concentration of single cells as these come from the feed and are only removed with the sludge.…”

Section: Resultsmentioning

confidence: 99%

Fouling of membranes in membrane bioreactors for wastewater treatment: Planktonic bacteria can have a significant contribution

Hansen

Nierychlo

Christensen

et al. 2020

Water Environment Research

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Membrane bioreactors (MBRs) for wastewater treatment show great potentials in the sustainable development of urban environments. However, fouling of membranes remains the largest challenge of MBR technology. Dissolved extracellular polymeric substances (EPS) are often assumed be the main foulant in MBRs. However, single bacterial cells are often erroneously measured as EPS in traditional spectrophotometric analysis of EPS in activated sludge, so we hypothesized that single cells in many cases could be the true foulants in MBRs for wastewater treatment. To study this, raw MBR sludge and sludge supernatant with varying concentrations of planktonic cells were filtered on microfiltration (MF) membranes, and we found a direct correlation between the cell count and rate of flux decline. Addition of planktonic cells to fresh MBR sludge dramatically increased the flux decline. The identity of the most abundant planktonic cells in a full‐scale MBR water resource recovery facility was determined by DNA fingerprinting. Many of these genera are known to be abundant in influent wastewater suggesting that the influent bacterial cells may have a direct effect on the fouling propensity in MBR systems. This new knowledge may lead to new anti‐fouling strategies targeting incoming planktonic bacteria from the wastewater feed. Practitioner points Planktonic cells constituted up to 60% of the total protein content of “soluble extracellular polymeric substances” in membrane bioreactor sludge. Planktonic cells are hidden under a surrogate concentration of extracellular polymeric substances which is often associated with fouling. Membrane fouling rate is directly proportional to amount of free planktonic cells suspended in sludge. Several influent bacterial genera are enriched in the water phase of membrane bioreactor sludge. Removing these may mitigate fouling.

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Section: Resultsmentioning

confidence: 99%

Fouling of membranes in membrane bioreactors for wastewater treatment: Planktonic bacteria can have a significant contribution

Hansen

Nierychlo

Christensen

et al. 2020

Water Environment Research

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“…Mariana [57] showed that Thermomonas may be potential targets for microfouling. Several studies [58,59] showed that Xanthomonas of Gammaproteobacteria is identified as an EPS producer and related to fouling development. The results suggested that the predominant dominant genera of 1#MBR and 2#MBR include Thermomonas.…”

Section: Analysis Of Microbial Community Structurementioning

confidence: 99%

The effect of aeration mode on the operational effectiveness and membrane bioreactors for greywater treatment and membrane fouling

Shi

Yan

Zuo

et al. 2022

Environmental Engineering Research

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This study aims to investigated the effect of aeration mode on membrane bioreactors (MBRs) using a self-designed integrated hollow fiber MBR and flat sheet organic MBR for rural greywater treatment. The pollutant removal efficiency, characteristics of activated sludge and mixed liquor, and mechanisms of membrane fouling were systematically analyzed under intermittent aeration and continuous modes. The results indicate that the permeability of MBRs in intermittent aeration mode is higher than that in the continuous aeration mode when operating at the same aeration rate. Due to the higher extracellular polymeric substance (EPS) and soluble microbial product (SMP) concentrations. The removal rates of TN and TP by both MBRs at the intermittent aeration mode were higher than those in the continuous aeration mode due to the difference in the aeration environment. Compared to the flat-sheet organic membrane, the hollow-fiber membrane surface was more likely to form biofilms, which cause biological fouling.The relative abundance of Thermomonas showed a positive correlation with the EPS concentration, indicating that Thermomonas participates in EPS synthesis. This study provides a theoretical basis for evaluating the influence of aeration modes on MBRs,and would be a useful guide for the better control of membrane fouling and treatment of rural greywater.

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Self-Forming Dynamic Membrane BioReactors (SFDMBRs) for wastewater treatment

How¹,

Kang²,

Min³

et al. 2023

Current Developments in Biotechnology and Bioengineering

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Mechanism of biofouling enhancement in a membrane bioreactor under constant trans-membrane pressure operation

Cited by 25 publications

References 39 publications

Fouling of membranes in membrane bioreactors for wastewater treatment: Planktonic bacteria can have a significant contribution

Fouling of membranes in membrane bioreactors for wastewater treatment: Planktonic bacteria can have a significant contribution

The effect of aeration mode on the operational effectiveness and membrane bioreactors for greywater treatment and membrane fouling

Self-Forming Dynamic Membrane BioReactors (SFDMBRs) for wastewater treatment

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