An innovative bioreactor set-up that reduces membrane fouling by adjusting the filamentous bacterial population

Banti, Dimitra C.; Karayannakidis, Panayotis D.; Samaras, P.; Mitrakas, Manassis

doi:10.1016/j.memsci.2017.08.034

Cited by 40 publications

(33 citation statements)

References 37 publications

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“…It is reported that the entrapment of zeolite in the microorganisms of activated sludge, especially nitrifiers, can increase the size of microbial flocs and result in enhanced settlement [23]. Recently, it was also found that the adjustment of the population of filamentous bacteria can reduce membrane fouling in MBRs [24]. Aiming to determine if the addition of bentonite and zeolite influence the number of filamentous microorganisms and, therefore, the settling capacity and fouling propensity of the MBR biomass, optical microscopy images were taken before and after the addition of both minerals to the mixed liquor samples at their optimal concentrations ( Figure 7).…”

Section: Optical Microscopy Imagesmentioning

confidence: 99%

The Use of Natural Minerals in a Pilot-Scale MBR for Membrane Fouling Mitigation

2020

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This study examines the effect of bentonite and zeolite concentration (0.25–5 g/L) on the membrane fouling of a fully automated, pilot-scale membrane bioreactor (MBR) treating high-strength synthetic municipal wastewater. Reversible fouling was estimated by sludge filterability measurements and irreversible fouling was estimated by the reduction of the carbohydrate fraction of soluble microbial products (SMPc), which are considered to be significant MBR foulants. Both minerals were added to biomass samples (during batch-mode experiments) which were obtained from the system’s aeration tank. Results showed that the optimal bentonite and zeolite concentrations were 3.5–4 g/L and 2.5–3.5 g/L, respectively. Interestingly, above these values, the addition of both minerals increased the examined fouling indices, i.e., the measured filterability times and the SMPc concentration, implying that they might act as foulants at high concentrations. Optical microscopy images of the biomass samples showed that the addition of minerals at the optimal concentrations did not affect significantly filamentous microorganisms, since filament index (FI) was practically unaffected (~2). Finally, regarding the system’s treating performance, it was found that the pilot-scale MBR can operate successfully with high-strength synthetic municipal wastewater, since remarkable behaviour was exhibited in terms of organics (BOD5, COD) and ammonium (NH4+-N) removal (>98%).

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Section: Optical Microscopy Imagesmentioning

confidence: 99%

The Use of Natural Minerals in a Pilot-Scale MBR for Membrane Fouling Mitigation

2020

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“…In MBRs, foaming appears to decrease the membrane permeability, due to the higher hydrophobicity of foaming sludge [10]. Recently, the study of Banti et al [30] showed that the filamentous bacterial population can be appropriately manipulated through the adjustment of the MBR configuration, and effectively result in the mitigation of membrane fouling.…”

Section: Other Fouling-related Wastewater and Biomass Characteristicsmentioning

confidence: 99%

Biomass Characteristics and Their Effect on Membrane Bioreactor Fouling

Gkotsis

Zouboulis

2019

Molecules

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Biomass characteristics are regarded as particularly influential for fouling in Membrane Bio-Reactors (MBRs). They primarily include the Mixed Liquor Suspended Solids (MLSS), the colloids and the Extracellular Polymeric Substances (EPS). Among them, the soluble part of EPS, which is also known as Soluble Microbial Products (SMP), is the most significant foulant, i.e., it is principally responsible for membrane fouling and affects all fundamental fouling indices, such as the Trans-Membrane Pressure (TMP) and the membrane resistance and permeability. Recent research in the field of MBRs, tends to consider the carbohydrate fraction of SMP (SMPc) the most important characteristic for fouling, mainly due to the hydrophilic and gelling properties, which are exhibited by polysaccharides and allow them to be easily attached on the membrane surface. Other wastewater and biomass characteristics, which affect indirectly membrane fouling, include temperature, viscosity, dissolved oxygen (DO), foaming, hydrophobicity and surface charge. The main methods employed for the characterization and assessment of biomass quality, in terms of filterability and fouling potential, can be divided into direct (such as FDT, SFI, TTF100, MFI, DFCM) or indirect (such as CST, TOC, PSA, RH) methods, and they are shortly presented in this review.

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“…Krzeminski et al (2017) A modified MBR configuration, with the aerated bioreactor divided into two in-series chambers, was found to reduce membrane fouling by adjusting the filamentous bacterial population. This was accomplished by adjusting the DO concentration to around 2.5 mg/L with an F/M ratio of 0.01 to 0.02 g COD/g MLSS/d (Banti et al, 2017). The transmembrane pressure was controlled to be in the range of 2-2.5 kPa over three months (Banti et al, 2017).…”

Section: Biologicalmentioning

confidence: 99%

“…This was accomplished by adjusting the DO concentration to around 2.5 mg/L with an F/M ratio of 0.01 to 0.02 g COD/g MLSS/d (Banti et al, 2017). The transmembrane pressure was controlled to be in the range of 2-2.5 kPa over three months (Banti et al, 2017).…”

Section: Biologicalmentioning

confidence: 99%

Food‐Processing Wastes

Frenkel¹,

Cummings²,

Maillacheruvu³

et al. 2018

Water Environment Research

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Literature published in 2017 and early 2018 related to food processing wastes treatment for industrial applications are reviewed. This review is a subsection of the Treatment Systems section of the annual Water Environment Federation literature review and covers the following food processing industries and applications: general, meat and poultry, fruits and vegetables, dairy and beverage, and miscellaneous treatment of food wastes.

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An innovative bioreactor set-up that reduces membrane fouling by adjusting the filamentous bacterial population

Cited by 40 publications

References 37 publications

The Use of Natural Minerals in a Pilot-Scale MBR for Membrane Fouling Mitigation

The Use of Natural Minerals in a Pilot-Scale MBR for Membrane Fouling Mitigation

Biomass Characteristics and Their Effect on Membrane Bioreactor Fouling

Food‐Processing Wastes

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