Aerobic granular sludge membrane bioreactor (AGMBR): Extracellular polymeric substances (EPS) analysis

Iorhemen, Oliver Terna; Hamza, Rania Ahmed; Zaghloul, Mohamed Sherif; Tay, Joo‐Hwa

doi:10.1016/j.watres.2019.03.020

Cited by 106 publications

(20 citation statements)

References 35 publications

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“…Iorhemen, Hamza, Zaghloul, and Tay (2019) studied the fouling development in aerobic granular sludge membrane bioreactors (AGMBRs) due to extracellular polymeric substances (EPS). They documented changes in the protein (PN) and polysaccharides (PS) components of the EPS corresponding to changes in TOC and time HRT.…”

Section: Membrane Foulingmentioning

confidence: 99%

Membrane processes

Arabi¹,

Pellegrin

Aguinaldo

et al. 2020

Water Environment Research

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This literature review provides a review for publications in 2018 and 2019 and includes information membrane processes findings for municipal and industrial applications. This review is a subsection of the annual Water Environment Federation literature review for Treatment Systems section. The following topics are covered in this literature review: industrial wastewater and membrane. Bioreactor (MBR) configuration, membrane fouling, design, reuse, nutrient removal, operation, anaerobic membrane systems, microconstituents removal, membrane technology advances, and modeling. Other subsections of the Treatment Systems section that might relate to this literature review include the following: Biological Fixed-Film Systems, Activated Sludge, and Other Aerobic Suspended Culture Processes, Anaerobic Processes, and Water Reclamation and Reuse. This publication might also have related information on membrane processes: Industrial Wastes, Hazardous Wastes, and Fate and Effects of Pollutants.

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Section: Membrane Foulingmentioning

confidence: 99%

Membrane processes

Arabi¹,

Pellegrin

Aguinaldo

et al. 2020

Water Environment Research

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“…The physical and chemical methods widely used in the treatment of petroleum wastewater include coagulation, electrochemical coagulation, and membrane technologies 14 . However, the high costs of these methods limit their applicability 15,16 …”

Section: Introductionmentioning

confidence: 99%

“…14 However, the high costs of these methods limit their applicability. 15,16 To overcome this global environmental threat, scientists are actively researching new and successful materials to extract oil/water mixtures and effectively recycle oil from wastewater. Mixed oils in water can be extracted using the absorption method.…”

Section: Introductionmentioning

confidence: 99%

Time and volume‐ratio effect on reusable polybenzoxazole nanofiber oil sorption capacity investigated via machine learning

Oflaz

Özaytekin

et al. 2021

J of Applied Polymer Sci

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Diesel oil sorption capacities (DOSCs) of polybenzoxazole/polyvinylidene fluoride nanofiber mats with four different groups (‐O‐, ‐S‐S‐, phenylene and diphenylene) in the main chain structures were investigated. Different experimental duration and diesel‐oil/tap‐water volume ratio pairs were used for diesel oil sorption. No degradation was observed in the nanofiber mat structures after diesel oil sorption. The characterizations of polybenzoxazole (PBO) nanofibers with high diesel oil selectivity were performed by scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, x‐ray diffraction, thermal gravimetric analysis, differential scanning calorimetry, Brunauer–Emmett–Teller (BET), and contact angle measurement analysis. According to the result of characterizations, superoleophilic and superhydrophobic nanofiber mats show high water contact angle value in the range of 132–140∘ and show high separation efficiency. In this study, we integrated ensemble gradient boosting model (XGBoost) to predict the DOSC of sorbent nanofiber and obtain an optimal set of conditions to maximize the DOSC. The predicted PBO‐E sorbent at the 0.5 ratio of diesel‐oil/tap‐water measured at the end of the 3rd minute showed the most reliable and stable diesel oil sorption with at least 9.39 and at most 12.33 g/g sorbent with 95% of confidence.

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“…A little attention has been drawn to this possible contribution from suspended planktonic cells to fouling propensity, although Wilén and co‐workers have shown that the major constituent of released particles in controlled deflocculation experiments was actually bacteria and floc fragments with only little release of soluble EPS (Wilen et al, 2000). Other powerful analytical techniques have been used to identify the chemical fingerprints to unravel EPS's contributing to fouling (Iorhemen, Hamza, Zaghloul, & Tay, 2019; Kimura, Ogyu, Miyoshi, & Watanabe, 2015), but they do not take into account the contribution of single cells. Hence, many of the previous foulant‐characterization studies in MBRs may have overestimated EPS fouling and underestimated the importance of single planktonic bacteria.…”

Section: Introductionmentioning

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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Aerobic granular sludge membrane bioreactor (AGMBR): Extracellular polymeric substances (EPS) analysis

Cited by 106 publications

References 35 publications

Membrane processes

Membrane processes

Time and volume‐ratio effect on reusable polybenzoxazole nanofiber oil sorption capacity investigated via machine learning

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

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