The microbiological decolorization of an industrial effluent containing a diazo-linked chromophore

Knapp, J. S.; Newby, P.S.

doi:10.1016/0043-1354(94)00341-4

Cited by 118 publications

(48 citation statements)

References 6 publications

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“…A maximum percentage of reduction was seen in consortia and their reduction percentages were COD -61.7%, Colour -75.38%, TS -60.10%, TSS -79%, TDS -73.2%,Turbidity -42.3%, Hardness -63.04%, Conductivity -14%, Resistivity -29.3%, Salinity -11.9%, pH -12.2%. Mixed bacterial cultures from a wide variety of habitats have shown to decolorize the diazolinked chromophore of dye molecules in 15 days (Knapp and Newby, 1995). A specific bacterium Pseudomonas putida was chosen to utilize the aromatic structures.…”

Section: Resultsmentioning

confidence: 99%

Biodecolorization and Bioremediation of Denim Industrial Wastewater by Adapted Bacterial Consortium Immobilized on Inert Polyurethane Foam (PUF) Matrix: A First Approach with Biobarrier Model

Rajendran¹,

Prabhavathi²,

Karthiksundaram³

et al. 2015

Pol J Microbiol

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A b s t r a c tThe present experiments were studied on bioremediation of denim industry wastewater by using polyurethane foam (PU foam) immobilized bacterial cells. About 30 indigenous adapted bacterial strains were isolated from denim textile effluent out of which only four isolates were found to be efficient against crude indigo carmine degradation using broth decolorization method. The selected bacterial strains were identified as Actinomyces sp., (PK07), Pseudomonas sp., (PK18), Stenotrophomonas sp., (PK23) and Staphylococcus sp., (PK28) based on microscopic and biochemical characteristics. The bacterial immobilized cells have the highest number of viable cells (PK07, PK18, PK23 and PK28 appeared to be 1 × 10 8 , 1 × 10 9 , 1 × 10 6 and 1 × 10 7 CFU/ml respectively) and maximum attachment efficiency of 92% on PU foam. The complete degradation using a consortium of PU foam immobilized cells was achieved at pH 6, 27°C, 100% of substrate concentration and allowed to develop biofilm for one day (1.5% W/V). In SEM analysis, it was found that immobilization of bacterial cells using PUF stably maintained the production of various extracellular enzymes at levels higher than achieved with suspended forms. Finally, isatin and anthranilic acid were found to be degradation products by NMR and TLC. The decolorized dye was not toxic to monkey kidney cell (HBL 100) at a concentration of 50 µl and 95% of cell viability was retained. A mathematical model that describes bacterial transport with biodegradation involves a set of coupled reaction equations with non-standard numerical approach based on the time step scheme. K e y w o r d s: biobarrier model, bioflim, bioremediation, cytotoxicity test, polyurethane foam, secondary metabolites

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Section: Resultsmentioning

confidence: 99%

Biodecolorization and Bioremediation of Denim Industrial Wastewater by Adapted Bacterial Consortium Immobilized on Inert Polyurethane Foam (PUF) Matrix: A First Approach with Biobarrier Model

Rajendran¹,

Prabhavathi²,

Karthiksundaram³

et al. 2015

Pol J Microbiol

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“…The occurrence of azo dye resistant bacteria in significant population at higher concentration emphasized the metabolic potential of autochthonous microorganisms. Knap and Newby [7] have reported the occurrence of dye resistant microorganisms in the contaminated soil. Mariappan et al [12] have recorded an appreciable amount of THBP in the azo dye contaminated soil ranging from 13.2 9 10 7 (site 4) to 32 9 10 7 (site 1).…”

Section: Resultsmentioning

confidence: 99%

“…SACO 2 at 44°C. It was well documented that Knapp and Newby [7] employed neutral pH for the degradation of azo dyes using bacterial consortia. Zimmermann et al [16] also employed neutral pH for using Pseudomonas KF 46 to degrade azo dyes.…”

Section: Resultsmentioning

confidence: 99%

“…Azo dyes at high concentrations and their intermediate amines pose environmental hazards due to their toxicity and potential carcinogenicity [6]. Microbes can degrade azo dyes both aerobically and anaerobically [7] and aerobic degradation is more efficient than anaerobic degradation. In the present study an effort was made to decolourise the Orange MR, azo dye aerobically by the autochthonous bacteria.…”

Section: Introductionmentioning

confidence: 99%

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Decolorization of Azo Dye (Orange MR) by an Autochthonous Bacterium, Micrococcus sp. DBS 2

Rajee

Patterson

2011

Indian J Microbiol

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Soil and sediment samples obtained from Orange MR dye contaminated habitat were screened for heterotrophic bacterial population. The heterotrophic bacterial density of dye-contaminated soil was 2.14 9 10 6 CFU/g. The generic composition of heterotrophic bacterial population was primarily composed of 10% of Proteus sp., 15% Aeromonas sp., 20% Bacillus sp., 25% Pseudomonas sp. and 30% Micrococcus sp. The bacterial strain that decolorized the azo dye Orange MR up to 900 ppm was identified as Micrococcus sp. The optimum inoculum load, pH and temperature were found to be 5%, 6 and 35°C, respectively. The rate of decolorization was assessed using spectrophotometer at 530 nm and the percentage of decolorization was ascertained. The autochthonous bacterial isolate was able to utilize the dye as both nitrogen and carbon source.

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“…semelhantes àquelas dos efluentes que são descartados. Ou seja, são necessários estudos laboratoriais reproduzindo as condições encontradas nas fábricas, de forma que a metodologia possa vir a ser aplicada.Vários processos são apresentados na literatura para a descoloração de efluentes têxteis, tais como biológico [8][9][10][11][12] , sorção utilizando o cucurbituril 13,14 , precipitação química, oxidação química, adsorção e suas combinações 15 e fotocatálise 16,17 . …”

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Avaliação dos tratamentos eletroquímico e fotoeletroquímico na degradação de corantes têxteis

Catanho¹,

Malpass²,

Motheo³

2006

Quím. Nova

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Orange 3R and Remazol Golden Yellow RNL) using electrochemical and photoelectrochemical methods. In both methods, electrolysis experiments were performed at a current density of 50 mA cm -2 in an aqueous solution of each dye (30 mg L -1 ), using a photoelectrochemical flow-cell. For all the dyes studied, the photoelectrochemical method was demonstrated to be more efficient than the electrochemical one. Photoelectrochemical oxidation resulted in complete decoloration after 90 min of electrolysis and total organic carbon (TOC) removal reached up to 36%. It was observed that the dyes presenting chromophores at higher wavelengths are removed the quickest, which indicates that photosensitised (photoassisted) oxidation occurs. The level of color was reduced to levels below the standards presented in the literature, which indicates the viability of the photoelectrochemical process as part of the treatment of textile effluents.Keywords: azo dye; reactive dye; DSA. INTRODUÇÃOOs resíduos de indústrias têxteis possuem como característica uma intensa coloração a qual, em ambientes aquáticos, pode causar uma interferência nos processos de fotossíntese. Além disso, certas classes de corantes, assim como seus subprodutos, podem ser carcinogênicos e/ou mutagênicos 1 . Estudos 2 indicam que a poluição colorida de cursos d'água começa a ser observável a concentrações acima de 1 mg L -1 . Além disso, resíduos da indústria têxtil podem conter metais pesados em níveis acima dos permitidos pelas leis ambientais 3 .A produção mundial de corantes e pigmentos é estimada entre 750.000 e 800.000 t/ano 2,3 sendo que cerca de 26.500 t/ano são consumidas no Brasil 1 . Desta quantidade, aproximadamente 12% dos corantes orgânicos são perdidos durante as etapas de produção e processamento 1 . Esta perda é relativamente pequena comparada com outros poluentes, como pesticidas, solventes e detergentes 1 ; porém, é importante enfatizar que a aplicação destes materiais geralmente envolve diluição, gerando um grande volume de efluente líquido.A classificação dos corantes pode ser pelo tipo de fibra, tais como corantes para nylon, algodão, poliéster, etc.; pelos métodos de aplicação no substrato, ou seja, pela maneira que eles são fixados à fibra têxtil (corantes diretos, reativos, à cuba, etc.), e de acordo com a sua estrutura química, como por ex.: azo, antraquinona, indigóides, etc.) 4-7 . Cerca de 60% dos corantes utilizados em indústrias têxteis são corantes azos, que se caracterizam pelo grupo -N=N-ligados a sistemas aromáticos 1 , sendo que a função azo inclui os principais tipos de corantes reativos. Os corantes reativos contêm um grupo eletrofílico (reativo) capaz de formar ligação covalente com grupos hidroxila das fibras celulósicas, com grupos amino, hidroxila e tióis das fibras protéicas e também com grupos amino das poliamidas. Devido às grandes quantidades de corantes que não são fixados às fibras e são liberados no processamento têxtil, é importante que seja estudada a degradação destes corantes em condições (de pH, condutividade, etc....

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The microbiological decolorization of an industrial effluent containing a diazo-linked chromophore

Cited by 118 publications

References 6 publications

Biodecolorization and Bioremediation of Denim Industrial Wastewater by Adapted Bacterial Consortium Immobilized on Inert Polyurethane Foam (PUF) Matrix: A First Approach with Biobarrier Model

Biodecolorization and Bioremediation of Denim Industrial Wastewater by Adapted Bacterial Consortium Immobilized on Inert Polyurethane Foam (PUF) Matrix: A First Approach with Biobarrier Model

Decolorization of Azo Dye (Orange MR) by an Autochthonous Bacterium, Micrococcus sp. DBS 2

Avaliação dos tratamentos eletroquímico e fotoeletroquímico na degradação de corantes têxteis

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