Combination of photoreactor and packed bed bioreactor for the removal of ethyl violet from wastewater

Chen, Chih-Yu; Yen, Shao-Hsiung; Chung, Ying‐Chien

doi:10.1016/j.chemosphere.2014.08.069

Cited by 19 publications

(8 citation statements)

References 33 publications

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“…34–36 In this regard, Bdellovibrio -related species also occurred simultaneously with the relatives of the OTUs 6262, 15507, and 25035 in a packed bed biofilm reactor. 37 Other potential predator bacteria (i.e., OTUs 5506 [ Acholeplasma laidlawii (KP742977; 100%)], 29658 and 20130 [ Leadbetterrella byssophila (NR074303; 94%)]) were frequently detected as highly increased species relative to the sludge microbiomes (Supplementary Table S4). 38–40 These results indicate that the bacterial predator–prey interaction may be a fundamental factor that contributes to the formation and development of the thick biofilm microbiomes in MBRs.…”

Section: Resultsmentioning

confidence: 99%

Architecture, component, and microbiome of biofilm involved in the fouling of membrane bioreactors

Inaba

Hori

Aizawa

et al. 2017

npj Biofilms Microbiomes

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Biofilm formation on the filtration membrane and the subsequent clogging of membrane pores (called biofouling) is one of the most persistent problems in membrane bioreactors for wastewater treatment and reclamation. Here, we investigated the structure and microbiome of fouling-related biofilms in the membrane bioreactor using non-destructive confocal reflection microscopy and high-throughput Illumina sequencing of 16S rRNA genes. Direct confocal reflection microscopy indicated that the thin biofilms were formed and maintained regardless of the increasing transmembrane pressure, which is a common indicator of membrane fouling, at low organic-loading rates. Their solid components were primarily extracellular polysaccharides and microbial cells. In contrast, high organic-loading rates resulted in a rapid increase in the transmembrane pressure and the development of the thick biofilms mainly composed of extracellular lipids. High-throughput sequencing revealed that the biofilm microbiomes, including major and minor microorganisms, substantially changed in response to the organic-loading rates and biofilm development. These results demonstrated for the first time that the architectures, chemical components, and microbiomes of the biofilms on fouled membranes were tightly associated with one another and differed considerably depending on the organic-loading conditions in the membrane bioreactor, emphasizing the significance of alternative indicators other than the transmembrane pressure for membrane biofouling.

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Section: Resultsmentioning

confidence: 99%

Architecture, component, and microbiome of biofilm involved in the fouling of membrane bioreactors

Inaba

Hori

Aizawa

et al. 2017

npj Biofilms Microbiomes

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“…Ethyl violet (EV) is a triphenylmethane dye with extensive industrial applications [11]. It has been reported that a significant amount of the dye could be lost during the dyeing processes of the textile industry and thus released to the wastewater [11]. Therefore, the removal of the dye from wastewater is crucial for improving the environmental impact of the textile industry.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of Phosphorylated Xylan as a Flocculant for Cationic Ethyl Violet Dye

Xia

et al. 2018

Polymers

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Abstract:In this study, phosphorylated birchwood xylan was produced under alkali conditions using trisodium trimetaphosphate. Three single-factor experiments were used to explore the influences of time, temperature, and the molar ratio of trisodium trimetaphosphate to xylan on the degree of substitution (DS) and charge density of xylan. The response surface methodology was used to explore the interaction of these three factors. Phosphorylated xylan with a maximum DS of 0.79 and a charge density of −3.40 mmol/g was produced under the optimal conditions of 80 • C, 4 h, and a molar ratio of xylan/sodium trimetaphosphate (STMP) of 1/3. Fourier transform infrared (FTIR), ascorbic acid method analyses, and inductively coupled plasma-atomic emission spectrometer (ICP-AES) analyses confirmed that the phosphate groups were successfully attached to xylan. Thermogravimetric analysis confirmed that phosphorylated xylan was less stable than birchwood xylan. Furthermore, the phosphorylated xylan was applied as a flocculant for removing ethyl violet dye from a simulated dye solution. The results indicated that more than 95% of the dye was removed from the solution. The theoretical and experimental values of charge neutralization for the dye removal were close to one another, confirming that charge neutralization was the main mechanism for the interaction of dye and phosphorylated xylan. The impacts of salts on the flocculation efficiency of phosphorylated xylan were also analyzed.

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“…Chen et al (2013) reported a relatively low degradation efficiency under acidic and neutral conditions which was attributed to: (1) it is difficult for cationic dye molecules to be adsorbed on a TiO 2 surface; and (2) lower pH conditions produce less active • OH radicals. Conversely, an alkaline environment favours the formation of active • OH species, thus increasing the removal efficiency (Chen et al, 2013;Chen et al, 2014). For example, TiO 2 in acidic conditions tends to agglomerate, reducing the surface area available for dye adsorption (Wang et al, 2006).…”

Section:  Phmentioning

confidence: 98%

Photocatalytic Reactors Dedicated to the Degradation of Hazardous Organic Pollutants: Kinetics, Mechanistic Aspects, and Design – A Review

Zeghioud

Khellaf

Djelal

et al. 2016

Chemical Engineering Communications

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International audienceIn recent years, heterogeneous photocatalysis has emerged as a new effective, powerful, clean, and safe decontamination technology for the treatment of organic pollutants and the transformation of hazardous chemicals into different forms. This review focuses on the recent development of various conventional technologies of reactors designated for the photodegradation of hazardous organic pollutants with their limitations. This phenomenon is strongly influenced by reaction conditions such as temperature of reaction, pH, light intensity and wavelength, pollutant concentration, photocatalyst quantity, relative humidity (RH), and other parameters. The catalyst photoactivity depends on the structural characteristics of the semiconductor, its morphology, and its particles size. This paper presents the progression of photocatalytic reactors for synthetic dyes degradation with special consideration to the use of supported photocatalyst and nanostructured titanium supported over volcanic ashes, owing to the major advantage of an easy separation of the catalyst when compared to homogenous system, namely suspended catalyst. In addition, special attention was paid to the literature dealing with the promotion of light efficiency by testing various light sources. © 2016, Copyright © Taylor & Francis Group, LLC

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Combination of photoreactor and packed bed bioreactor for the removal of ethyl violet from wastewater

Cited by 19 publications

References 33 publications

Architecture, component, and microbiome of biofilm involved in the fouling of membrane bioreactors

Architecture, component, and microbiome of biofilm involved in the fouling of membrane bioreactors

Preparation and Application of Phosphorylated Xylan as a Flocculant for Cationic Ethyl Violet Dye

Photocatalytic Reactors Dedicated to the Degradation of Hazardous Organic Pollutants: Kinetics, Mechanistic Aspects, and Design – A Review

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