Monitoring of toxicity and intermediates of C.I. Direct Black 38 azo dye through decolorization in an anaerobic/aerobic sequential reactor system

Işık, Mustafa; Sponza, Deli̇a Teresa

doi:10.1016/j.jhazmat.2004.06.011

Cited by 83 publications

(31 citation statements)

References 54 publications

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“…The acute toxicity tests with the effluent samples had durations of 24-96 h; and after this time of exposure, the number of immobile organisms was observed and noted. The organisms were considered immobile if they did not show any mobility during 20 s of observation [11,27,28]. For the calculation of LC 50 , probit analysis, SPSS (ver.…”

Section: Acute Toxicity Test With D Magnamentioning

confidence: 99%

Enzymatic Treatment and Detoxification of Acid Orange 7 from Textile Wastewater

Gholami-Borujeni

Mahvi

Nasseri

et al. 2011

Appl Biochem Biotechnol

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A crude preparation of horseradish roots was used as a low-purity source of horseradish peroxidase (HRP) in dye decolorization experiments. The technical feasibility of the process was studied in bench scale for enzymatic removal of acid orange 7 (AO7), a synthetic dye. Further studies were carried out to understand the effects of process parameters such as pH value, H(2)O(2) level, concentrations of the synthetic dye, and HRP during enzyme-mediated dye degradation. Experimental data revealed that the concentration of AO7, pH of the aqueous phase, amount of the enzyme, and H(2)O(2) level played significant roles on the overall enzymatic reaction. Polyethylene glycol, as an anti-inactivation of HRP, in various concentrations showed no significant effect on the decolorization. The experimental data of initial reaction rates were fitted using an analytical equation proposed by Michaelis-Menten. The acute toxicity tests using Daphnia magna exhibited that the enzymatic treatment significantly decreased the toxicity of the dye solution.

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Section: Acute Toxicity Test With D Magnamentioning

confidence: 99%

Enzymatic Treatment and Detoxification of Acid Orange 7 from Textile Wastewater

Gholami-Borujeni

Mahvi

Nasseri

et al. 2011

Appl Biochem Biotechnol

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“…The steady state results were obtained at a gradually rising HRT. The overall degradation of dye and co-substrate was enhanced, as HRT increased up to a certain level, but the enhancement became lower immediately, if the HRT increased at a high rate (Isik and Sponza 2004b;Albuquerque et al 2005).…”

Section: Hydraulic Retention Timementioning

confidence: 97%

Microbial Degradation of Dye-Containing Wastewater

Mondal

Chauhan

2011

Environmental Science and Engineering

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“…The second stage involves degradation of the aromatic amines under aerobic conditions since these compounds are usually recalcitrant under anaerobic conditions. Hence, a wastewater treatment process in which anaerobic and aerobic conditions are combined is reported to be the most logical and economical concept for removing azo dyes from wastewater [12], and it has been extensively investigated [11,[13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…An indirect form of evaluation of these by-products' (aromatic amines) mineralisation is either following chemical oxygen demand (COD) reduction or applying a toxicity evaluation [13]. Therefore, acute toxicity assays of effluents generated in this sequential treatment is an important tool for assessing mineralisation and detoxification ability of biological processes on textile wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Sequential Anaerobic/Aerobic Treatment of Dye-Containing Wastewaters: Colour and COD Removals, and Ecotoxicity Tests

Silva

Firmino

Sousa

et al. 2012

Appl Biochem Biotechnol

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Colour and COD removals of the azo dyes Congo Red (CR) and Reactive Black 5 (RB5) were individually evaluated in a sequential anaerobic/aerobic treatment system. Additionally, dye toxicity was assessed by using acute ecotoxicity tests with Daphnia magna as the indicator-organism. The anaerobic reactor was operated at approximately 27 °C and with hydraulic retention times of 12 and 24 h. The aerobic reactor was operated in batch mode with a total cycle of 24 h. During anaerobic step, high colour removals were obtained, 96.3% for CR (400 mg/L) and 75% for RB5 (200 mg/L). During the aerobic phase, COD effluent was considerably reduced, with an average removal efficiency of 52% for CR and 85% for RB5, which resulted in an overall COD removal of 88% for both dyes. Ecotoxicity tests with CR revealed that the anaerobic effluent presented a higher toxicity compared with the influent, and an aerobic post-treatment was not efficient in reducing toxicity. However, the results with RB5 showed that both anaerobic and aerobic steps could decrease dye toxicity, especially the aerobic phase, which removed completely the toxicity in D. magna. Therefore, the anaerobic/aerobic treatment is not always effective in detoxifying dye-containing wastewaters, sometimes even increasing dye toxicity.

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Monitoring of toxicity and intermediates of C.I. Direct Black 38 azo dye through decolorization in an anaerobic/aerobic sequential reactor system

Cited by 83 publications

References 54 publications

Enzymatic Treatment and Detoxification of Acid Orange 7 from Textile Wastewater

Enzymatic Treatment and Detoxification of Acid Orange 7 from Textile Wastewater

Microbial Degradation of Dye-Containing Wastewater

Sequential Anaerobic/Aerobic Treatment of Dye-Containing Wastewaters: Colour and COD Removals, and Ecotoxicity Tests

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