Automatic microfiber filtration (AMF) of surface water: Impact on water quality and biofouling evolution

Lakretz, Anat; Elifantz, Hila; Kviatkovski, Igor; Eshel, Gonen; Mamane, Hadas

doi:10.1016/j.watres.2013.10.018

Cited by 11 publications

(9 citation statements)

References 25 publications

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“…A detailed description of this analysis is published elsewhere. 27 In brief, a fluid sample is drawn through a flow cell, illuminated with a light-emitting diode at 470 nm wavelength, and the magnified image is captured by digital camera. This image was automatically analyzed to determine the particles' equivalent circular diameter (ECD), which represents the diameter of a sphere that occupies the same two-dimensional surface area as the particle.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…This apparatus employs a digital camera with an illumination and magnification system to capture in situ images of suspended particles in a flowing sample. A detailed description of this analysis is published elsewhere . In brief, a fluid sample is drawn through a flow cell, illuminated with a light-emitting diode at 470 nm wavelength, and the magnified image is captured by digital camera.…”

Section: Methodsmentioning

confidence: 99%

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Influence of Wastewater Particles on Ozone Degradation of Trace Organic Contaminants

Zucker

Lester

Avisar

et al. 2014

Environ. Sci. Technol.

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In this Article, we demonstrate the influence of effluent particles (in the range of <50 μm) on ozone degradation of trace organic contaminants (TrOCs) and effluent-quality parameters. Secondary effluent was filtered through different pore-size filters and ozonated at various ozone doses. Degradation of both ozone-reactive and ozone-refractory contaminants improved following ozonation of effluent filtered with smaller pore size filters, indicating that particles in this range may adversely affect ozonation. The inhibitory effect of particles was attributed to their reaction with ozone, reducing available ozone and HO(•) radicals. In addition, increasing filtration level decreased the effluent's (instantaneous) ozone demand and increased removal of effluent UV absorbance (UVA254), further establishing that ozone reacts with effluent particles, in competition with dissolved matter. Moreover, ozone was shown to react with particles even during the first seconds of the process, suggesting a high rate of some ozone-particle reactions, comparable to ozone reaction with highly reactive dissolved organic matter moieties. Particle image analysis revealed that particle formation/aggregation and particle disintegration occurs simultaneously during wastewater (WW) ozonation. Our study implies that particles could affect the efficiency of WW ozonation, by increasing the effluent's ozone demand and decreasing contaminant degradation.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Influence of Wastewater Particles on Ozone Degradation of Trace Organic Contaminants

Zucker

Lester

Avisar

et al. 2014

Environ. Sci. Technol.

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“…Using an AMF system, Lakretz et al recently reported that planktonic microbial composition remains unchanged, while biofilm composition has changed significantly. 178 AMF is unlikely to retain most of the small TEP, TEP precursors, or bacteria cells. Thus, one could postulate that the evident reduction in biofilm formation and change in biofilm community composition is due to the removal of protobiofilms as suggested by Bar-Zeev et al 7 El-Azizi et al suggested adsorbing negatively charged, submicrometer contaminants such as TEP to an electropositive nanoalumina "Disruptor" filter.…”

Section: Recent Developments For Tep Removalmentioning

confidence: 99%

Transparent Exopolymer Particles: From Aquatic Environments and Engineered Systems to Membrane Biofouling

Bar‐Zeev

Passow

Castrillón

et al. 2015

Environ. Sci. Technol.

161

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Transparent exopolymer particles (TEP) are ubiquitous in marine and freshwater environments. For the past two decades, the distribution and ecological roles of these polysaccharide microgels in aquatic systems were extensively investigated. More recent studies have implicated TEP as an active agent in biofilm formation and membrane fouling. Since biofouling is one of the main hurdles for efficient operation of membrane-based technologies, there is a heightened interest in understanding the role of TEP in engineered water systems. In this review, we describe relevant TEP terminologies while critically discussing TEP biological origin, biochemical and physical characteristics, and occurrence and distributions in aquatic systems. Moreover, we examine the contribution of TEP to biofouling of various membrane technologies used in the desalination and water/wastewater treatment industry. Emphasis is given to the link between TEP physicochemical and biological properties and the underlying biofouling mechanisms. We highlight that thorough understanding of TEP dynamics in feedwater sources, pretreatment challenges, and biofouling mechanisms will lead to better management of fouling/biofouling in membrane technologies.

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“…The microbial community of the biomass was indigenous and developed over time by feeding the biofilter with the secondary effluent. It was assumed that the accumulation and growth of viable bacteria in the filter, most of which were fixed to the media, was the basis for the bacterial activity [6,[37][38][39].…”

Section: System Specification and Operational Parametersmentioning

confidence: 99%

Stimulating Nitrogen Biokinetics with the Addition of Hydrogen Peroxide to Secondary Effluent Biofiltration

et al. 2020

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Tertiary wastewater treatment could provide a reliable source of water for reuse. Amongst these types of wastewater treatment, deep-bed filtration of secondary effluents can effectively remove particles and organic matter; however, NH4+ and NO2− are not easily removed. This study examined the feasibility of stimulating microbial activity using hydrogen peroxide (H2O2) as a bio-specific and clean oxygen source that leaves no residuals in the water and is advantageous upon aeration due to the solubility limitations of the oxygen. The performance of a pilot bio-filtration system at a filtration velocity of 5–6 m/h, was enhanced by the addition of H2O2 for particle, organic matter, NH4+, and NO2− removal. Hydrogen peroxide provided the oxygen demand for full nitrification. As a result, influent concentrations of 4.2 ± 2.5 mg/L N-NH4+ and 0.65 ± 0.4 mg/L N-NO2 were removed during the short hydraulic residence time (HRT). In comparison, filtration without H2O2 addition only removed up to 0.6 mg/L N-NH4+ and almost no N-NO2−. A DNA metagenome analysis of the functional genes of the media biomass reflected a significant potential for simultaneous nitrification and denitrification activity. It is hypothesized that the low biodegradability of the organic carbon and H2O2 addition stimulated oxygen utilization in favor of nitrification, followed by the enhancement of anoxic activity.

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Automatic microfiber filtration (AMF) of surface water: Impact on water quality and biofouling evolution

Cited by 11 publications

References 25 publications

Influence of Wastewater Particles on Ozone Degradation of Trace Organic Contaminants

Influence of Wastewater Particles on Ozone Degradation of Trace Organic Contaminants

Transparent Exopolymer Particles: From Aquatic Environments and Engineered Systems to Membrane Biofouling

Stimulating Nitrogen Biokinetics with the Addition of Hydrogen Peroxide to Secondary Effluent Biofiltration

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