Rhamnolipid from Pseudomonas aeruginosa can improve the removal of Direct Orange 2GL in textile dye industry effluents

Azo dyes are widely used in textile industry. Unused dyes, consisting mainly non biodegradable released along with waste water streams without any proper pre-treatment which cause nuisance for environment and accumulate in flora as well as fauna. These also exhibit allergic, carcinogenic and mutagenic properties for human beings. Isolation and screening of azo dye degrading bacteria are economic in biodegradation and detoxification. In the present study, 200 waste water samples were collected from dye-contaminated sites of textile industries and bacterial species such as Bacillus subtilis, Pseudomonas aeruginosa and Psuedomonas putida were isolated and identified. Evaluation of decolorizing properties of these bacteriae were done by UV-Vis spectroscopy (Amax 596 nm) in different concentrations using different carbon sources such as Hans’s medium and GYP medium. Maximum decolourisation of 0.1% azo dyes were recorded to be 89.0%, 91% and 86% in Hans medium containing charcoal source by Bacillus subtilis, Pseudomonas aeruginosa and Psuedomonas putida respectively at 24 hrs. These bacterial isolates may be utilized in large scale for pre-treatment for ecological balance by avoiding water pollution.

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Orange Peel-Based Adsorbent for the Removal of C.I. Disperse Blue 56 from Textile Dye Industry Effluents

10.20944/preprints202103.0504.v1 ◽

2021 ◽

Author(s):

Nadia Torres ◽

Josep García-Raurich ◽

Jose Maria Canal ◽

Marta Riba-Moliner

Keyword(s):

Adsorption Capacity ◽

Orange Peel ◽

Low Ph ◽

Textile Dye ◽

Disperse Dye ◽

Waste Waters ◽

Ph Values ◽

Chemically Treated ◽

Dye Industry

This study demonstrates the viability of an orange peel-based adsorbent as sustainable alternative for the elimination of the disperse dye C.I. Disperse Blue 56 present in waste waters of the dyeing industry of textiles. The effectiveness of the adsorbent is evaluated at different pH values and the adsorption capacity is determined by systematically comparing orange peel and the final adsorbent chemically treated. Results reveal an spontaneous coagulation-flocculation phenomenon of the dispersed dye at low pH values which represents a sustainable way for the recovery and possible re-use of the dye, together with the industrial valorisation of a wasting product as is orange peel.

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SYNTHESIS OF SODALITE ZEOLITE TO TREATMENT OF TEXTILE EFFLUENTS

Periódico Tchê Química ◽

10.52571/ptq.v16.n31.2019.789_periodico31_pgs_778_783.pdf ◽

2019 ◽

Vol 16 (31) ◽

pp. 778-783

Author(s):

Marcos Antonio KLUNK ◽

Sudipta DASGUPTA ◽

Bruno Vinicius Gomes NUNES ◽

Paulo Roberto WANDER

Keyword(s):

Molecular Sieves ◽

Textile Industry ◽

Dye Adsorption ◽

Exchange Capacity ◽

Textile Dye ◽

X Ray Diffraction ◽

Textile Effluents ◽

Violet Crystal ◽

Effective Removal ◽

Dye Industry

Textile dye industry causes environmental impacts due to inappropriate disposal of effluents. Several processes have been studied to effective treatment in the dye removal, one of the main molecular sieves (zeolites). The zeolite material, especially sodalite, has the ability to adsorb the metals and functional chromophore groups. Therefore, the sodalite has characteristics that have attention to the scientific community for the treatment of textile effluents. The aim of this work was to synthesize and evaluate the use of sodalite zeolite in four Si/Al ratios (1.0, 1.5, 2.0 and 2.5) and to test the adsorption capacity in the presence of violet crystal textile dye. As result, the synthesized zeolites presented a characteristic that places them in the adsorbent materials. Among the techniques used for characterization, we have the mean pore diameter between 1.65 and 2.07 nm. X-ray diffraction revealed crystalline phases as sodalite zeolite with the presence of kaolinite, mullite, and quartz. Cation-exchange-capacity was between 0.8871 to 1.017 meq/g, where it had a 14.65% increase of the 2.5-SOD sample. The dye adsorption process was reduced to 12% (44 mg/L). Thus, it has concluded that the obtained sodalite zeolites have potential in the effective removal of dyes from the textile industry.

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