Degradation of azo dyes by sequential Fenton's oxidation and aerobic biological treatment

Tantak, Nilesh P

doi:10.1016/j.jhazmat.2005.12.049

Cited by 156 publications

(75 citation statements)

References 30 publications

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“…It was also observed during the study that at pH lower than pH 3, the degradation efficiency decreases; it may be due to scavenging of hydroxyl radical with H + ions as also reported by Neyens and Baeyens [48]. The observed maximum decolorization at pH 3 is in agreement with previous studies [1,29,42,43,49].…”

Section: Optimization Of Ph For Decolorizationsupporting

confidence: 91%

“…Many researchers [1,29,42,43,49] have shown that complete color removal is possible at pH 3. During the dose optimization studies the dyes concentration were kept constant at 50 mg L −1 and the pH of the dye solutions (pH 3) and Fe 2+ dose of 20 mg L −1 (0.36 mM) were kept constant.…”

Section: Optimization Of H 2 O 2 Dose For Decolorizationmentioning

confidence: 99%

“…The H 2 O 2 was almost completely consumed after the 8 min of the reaction for all three dye solutions and hence the Fenton's treated effluent is considered to be safe for the subsequent biological treatment after pH adjustment to 7. However, Tantak and Chaudhari [42] reported the residual H 2 O 2 in the Fenton's treated effluent. It was also found during the studies that H 2 O 2 dosage was consumed in the early stage of the Fenton reaction.…”

Section: Residual H 2 Omentioning

confidence: 99%

“…In most of the previous research works using Fenton's reagent for the treatment of various dyes, the main objective was to mineralize and decolorize the dyes simultaneously and hence a higher doses of H 2 O 2 and Fe 2+ ions were used for the treatment of dyes. In most of the studies, the dye:H 2 O 2 :Fe 2+ mass ratios (w/w/w) ranging between 1:0.25:0.08 and 1:48.96:1.16 were used [41][42][43][44]. At higher doses of the reagents (Fe 2+ and H 2 O 2 ), the operational cost of treatment increases and thus, in this study it was decided to optimize lower doses of reagents for only decolorization of dyes (breaking of -N N-).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimization of Fenton-biological treatment scheme for the treatment of aqueous dye solutions

Lodha

2007

Journal of Hazardous Materials

191

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Section: Optimization Of Ph For Decolorizationsupporting

confidence: 91%

Section: Optimization Of H 2 O 2 Dose For Decolorizationmentioning

confidence: 99%

Section: Residual H 2 Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of Fenton-biological treatment scheme for the treatment of aqueous dye solutions

Lodha

2007

Journal of Hazardous Materials

191

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“…Therefore, industrial effluents, like textile wastewater containing dyes must be treated before their discharge into the environment. The dye wastewater fro m the text ile is one of the most difficu lt wastewater to treat [11,12]. Because of their commercial importance, the impact and to xicity of dyes that are released in the environment have been extensively studied [13].…”

Section: Introductionmentioning

confidence: 99%

Isolation and Screening of Dye Degrading Micro-organisms from the Effluents of Dye and Textile Industries at Surat

Thakur¹,

Khan²,

Doshi³

2012

AJEE

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Text ile dyes have been used since the Bronze Age. They also constitute a prototype 21 st -century speciality chemicals market. Effluent and soil samp les were collected fro m textile industry at Surat. The pH, temperature, BOD, COD, Nitrate and Nitrite values were co mpared with the values given by the Bureau of Indian Standards. The culture med iu m was designed and standardized in the laboratory for the isolation and degradation of the dyes. Pure cultures were screened on the basis of colony morphology. Three different types of unique cultures were selected and named as isolates S1, S2 & S3. Out of 12 dyes used, isolate S1 showed degradation on the maximu m nu mber of dyes (five) in co mparison to other isolates (isolates S2 and S3). Thus, isolate S1 was used for the further studies. The isolate S1 was used for the study of the amount of dye to be degraded. For this study Red BB dye was chosen. Because, isolate S1 showed maximu m degradation on Red BB dye within less time of incubation in comparison with other dyes. Almost all isolates showed the positive results in some of the biochemical tests. Thus most of the isolates can have the capacity to produce the enzyme tryptophanase, indole production, citrate permease (citrate as carbon and energy source), catalase enzy me, degradation of glucose oxidatively as well as fermentatively, urease, gelatinase, production of acid and gas (allo w to ferment lactose and/or sucrose) and fermentation of sugar, lactose, sucrose, mannitol and glucose. Total cellu lar fatty acids profiling has been considered to be one of the important and ideal tool for identification of microorganis ms. On the basis of fatty acid pro filing of isolate S1 the similarity index indicated as Bacillus cereus GC subgroup A (similarity index 0.825), B. thuringiensis sub sp. israelensis (similarity index 0.552) and for B. thuringiensis sub sp. Kurstakii (similarity index 0.511). The isolate S1 was assumed to be B. cereus GC subgroup A. Thus this isolates can be used to degrade harmful azo dyes utilized by the dye, text ile, paper, in k industries etc.

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Preparation of sulfonated poly(ethylene terephthalate) submicron fibrous membranes for removal of basic dyes

Chegoonian

Feiz

Ravandi

et al. 2012

J of Applied Polymer Sci

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In this investigation, a nanofibrous sulfonated poly(ethylene terephthalate) (SPET) membrane was prepared by electrospinning of the SPET solution in trifluoroaceticacid (TFA)/dichloromethane (DCM) mixture. The produced nanofibers had diameter ranging from 300 nm to 1 lm. The performance of this membrane's separation process was evaluated under different operating conditions. The influence of the electrospinning and filtration process parameters, such as concentration, applied voltage, deposition time, operating pressure, and filtration time on rejection of C.I. Basic Blue 3 were studied. The dead-end recirculation ultrafiltration set-up was employed. Under optimum conditions (concentration of 20% (w/v) of SPET, applied voltage of 20 kV and deposition time of 3 h) the removal of the aforementioned dye was 98%. Operating pressure has posed a significant influence on the membrane's separation performance, whereas the operating time had some effect on the separation performance. Two equilibrium adsorption isotherms: Langmuir and Freundlich were fitted to the dyes' equilibrium sorption data on SPET membrane at different feed concentrations. The Freundlich isotherm was found to well represent the measured adsorption data based on the higher coefficient of determination (r 2 ). V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 124: E190-E198, 2012

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Degradation of azo dyes by sequential Fenton's oxidation and aerobic biological treatment

Cited by 156 publications

References 30 publications

Optimization of Fenton-biological treatment scheme for the treatment of aqueous dye solutions

Optimization of Fenton-biological treatment scheme for the treatment of aqueous dye solutions

Isolation and Screening of Dye Degrading Micro-organisms from the Effluents of Dye and Textile Industries at Surat

Preparation of sulfonated poly(ethylene terephthalate) submicron fibrous membranes for removal of basic dyes

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