Chlorine disinfection of dye wastewater: Implications for a commercial azo dye mixture

Vacchi, Francine Inforçato; Albuquerque, Anjaína Fernandes de; Vendemiatti, Josiane Aparecida de Souza; Morales, Daniel Alexandre; Ormond, Alexandra B.; Freeman, Harold S.; Zocolo, Guilherme Julião; Zanoni, María Valnice Boldrin; Umbuzeiro, Gisela de Aragão

doi:10.1016/j.scitotenv.2012.10.019

Cited by 70 publications

(51 citation statements)

References 30 publications

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“…Therefore, testing azo disperse dyes for toxicity can be a challenging proposition. In addition to the fact that disperse dyes are typically available as commercial products containing either diluents such as dispersing agents or subsidiary colorants , their water solubility is usually <0.1%. This is important because toxicity tests are best performed with solubilized dye rather than dispersions or heterogeneous mixtures.…”

Section: Introductionmentioning

confidence: 99%

Purification and characterization of three commercial phenylazoaniline disperse dyes

Umbuzeiro

Szymczyk

et al. 2017

Coloration Technology

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Although tons of disperse dyes are used worldwile, little information on their ecotoxicity is available. While in silico models can be used to predict their ecotoxicity, experimental results from Daphnia can show significantly higher toxicity than predicted. Thus the objective of this work was to extend the knowledge base in this area by evaluating the ecotoxicity of three widely used disperse dyes and comparing the results to predicted values. Bearing in mind that generating ecotoxicity data on azo disperse dyes is complicated because they are not readily found as homogeneous compounds, we employed chromatographic methods to purify three commercially dyes C.I. Disperse Violet 93, Blue 291, and Blue 373 already found in the aquatic environment. No acute toxicity was observed for Daphnia similis. These results seems to be in general agreement when compared with ECOSAR predicted values. We hypothesize that differences in Kow values could explain the variations in results.

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Section: Introductionmentioning

confidence: 99%

Purification and characterization of three commercial phenylazoaniline disperse dyes

Umbuzeiro

Szymczyk

et al. 2017

Coloration Technology

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“…Representative aromatic organics in dispersed dye-production wastewater, such as 2-chloro-4-nitroaniline, 3-ethylanilinopropiononitrile, phenol, 3,5-dichlorophenol, and 3-chloronitrobenzene, were used to investigate the optimal dosages of bentonite, CTMAB, and PAC 1, 43 . The detailed characteristics of the selected pollutants are shown in the Supporting Information (Table S1).…”

Section: Methodsmentioning

confidence: 99%

Enhanced treatment of dispersed dye-production wastewater by self-assembled organobentonite in a one-step process with poly-aluminium chloride

Liu

Zhu

2017

Sci Rep

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Organobentonite has been successfully applied in industrial wastewater treatment. However, the solid-liquid separation in wastewater treatment still needs improvement. This study presents an enhanced approach with high removal efficiency and short separation time for dispersed dye-production wastewater using self-assembled organobentonite in a one-step process with poly-aluminium chloride (PAC). The enhanced effects of PAC on wastewater treatment by organobentonite were comprehensively evaluated. Following the primary decontamination by the self-assembled organobentonite, the removal efficiency for dispersed dye-production wastewater was strengthened with PAC coagulation. The removal rates of TOC and organic pollutants were 55.0% and 63.5%, respectively, with the PAC-enhanced approach and were 1.3- and 1.6-fold higher, respectively, than those with the self-assembled organobentonite approach. The combination of PAC with self-assembled organobentonite was able to break the stability of the organobentonite suspension and enlarge the floc size, and thus reduce the solid-liquid separation time from 30 min to 10 min. Additionally, this enhanced approach could improve the biodegradability of wastewater with the BOD5/CODCr ratio increasing from 0.22 to 0.39, which was 4.1-fold higher than that of only organobentonite in a one-step process. Therefore, the PAC-enhanced approach could be a promising technology for wastewater pretreatment in practical industrial applications.

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“…2(a) and 3(a), the CEME system not only completely removed chloride ions, but also recovered them as a resource (gaseous chlorine) for on-site utilization. However, during RhB decolorization, gaseous chlorine would react with RhB to form highly toxic chlorine by-products [28]. Thus, for the safe and highly efficient reuse of gaseous chlorine, a previous study reported that recovered gaseous chlorine can be utilized as an excellent oxidant for treating other toxic pollutants (i.e., arsenite (As(III)) to less toxic As(V)) [29].…”

Section: Recycling Gaseous Chlorine For Decolorizing Synthetic Dyeingmentioning

confidence: 99%

Recovery of potassium from landfill leachate concentrates using a combination of cation-exchange membrane electrolysis and magnesium potassium phosphate crystallization

Wang

et al. 2015

Separation and Purification Technology

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Chlorine disinfection of dye wastewater: Implications for a commercial azo dye mixture

Cited by 70 publications

References 30 publications

Purification and characterization of three commercial phenylazoaniline disperse dyes

Purification and characterization of three commercial phenylazoaniline disperse dyes

Enhanced treatment of dispersed dye-production wastewater by self-assembled organobentonite in a one-step process with poly-aluminium chloride

Recovery of potassium from landfill leachate concentrates using a combination of cation-exchange membrane electrolysis and magnesium potassium phosphate crystallization

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