Estimation of biosorption characteristics of chromium (VI) from aqueous and real tannery effluents by treated T. vulgaris: experimental assessment and statistical modelling

West Bengal has several leather industries and as such huge amount of leather are processed every year. The tannery effluents are discharged into the land and open water causing soil and water pollution respectively. Chromium is one of the most toxic inorganic contaminants which is well known for its carcinogenicity. Thus, our study focuses on investigating the bioremediation potential of common microflora isolated from tannery wastewater. In our study, Isolate 1 has the highest ability to reduce chromium (Cr6+) as compared to others. Isolate 4 has the highest protease, lipase and leather degradation activities. Isolate 1 shows the maximum keratinase activity making it an effective strain for keratinase production. Also, it has been found that pH 8 and temperature 40 °C was most suitable for keratinase production. Owing to the multidimensional ability of these two isolates, they were identified by 16S rRNA sequencing and it reveals that Isolate 1 and Isolate 4 belong to Bacillus cereus F4810/72 and Brevibacillus brevis F4810/72 respectively. Thus, this study establishes the role and efficiencies of these microorganisms in combatting pollution, particularly in the water bodies in which harmful chemicals leak regularly owing to improper waste management by various industries.

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Natural Zeolite As A Chromium Vi Removal Agent In Tannery Effluents

Heliyon ◽

10.1016/j.heliyon.2021.e07974 ◽

2021 ◽

pp. e07974

Author(s):

Ana María Alvarez ◽

Darío Bolaños Guerrón ◽

Carolina Montero

Keyword(s):

Natural Zeolite ◽

Tannery Effluents ◽

Chromium Vi

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Removal of Chromium(VI) Ions from Aqueous Solutions and Industrial Effluents Using Magnetic Fe3O4 Nano-particles

Adsorption Science & Technology ◽

10.1260/0263-6174.27.7.701 ◽

2009 ◽

Vol 27 (7) ◽

pp. 701-722 ◽

Cited By ~ 16

Author(s):

K.M. Meera Sheriffa Begum ◽

N. Anantharaman

Keyword(s):

Experimental Data ◽

Aqueous Solutions ◽

Adsorption Process ◽

Industrial Effluents ◽

Nano Particles ◽

Feed Concentration ◽

Tannery Effluents ◽

Batch Mode ◽

Chromium Vi ◽

Co Precipitation

The adsorption characteristics of magnetic Fe3O4 nano-particles synthesized by chemical co-precipitation for the removal of chromium(VI) ions from aqueous solutions and tannery effluents have been studied. The composition, size, morphology and magnetic properties of the nano-particles were characterized by FT-IR, XRD, TEM and VSM methods, respectively. Experiments were conducted in batch mode to observe the influence of different parameters such as pH, feed concentration, adsorbent dosage and temperature on the performance of the adsorbent. It was found that when the pH of the system was decreased from 7 to 2, the extent to which Cr(VI) ions were removed increased from 54% to 77%. The adsorption process was found to follow second-order kinetics and the rate constant was evaluated at 30 °C. The Langmuir isotherm was found to provide a good fit to the experimental data. The adsorption capacity of magnetite nano-particles towards Cr(VI) ions at room temperature was 2.9508 mg/g, with the value increasing to 3.4454, 3.7592 and 4.0475 mg/g at 40 °C, 50 °C and 60 °C, respectively. On the basis of the adsorption free energy change of 16.577 kJ/mol obtained at 30 °C, the adsorption mechanism was confirmed as being chemical in nature. The thermodynamic parameters for the adsorption process were also calculated from the experimental data. At an S/L ratio of 0.2 and under optimized conditions of pH, temperature and agitation, the removal of Cr(VI) ions from aqueous solution amounted to 85%. Regression analysis was performed and a correlation between percentage removal and operating parameters obtained.

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Adsorption of chromium ions from tannery effluents onto activated carbon prepared from rice husk and potato peel by H3PO4 activation

Applied Water Science ◽

10.1007/s13201-021-01477-3 ◽

2021 ◽

Vol 11 (9) ◽

Author(s):

Ephraim Vunain ◽

Joel Brian Njewa ◽

Timothy Tiwonge Biswick ◽

Adewale Kabir Ipadeola

Keyword(s):

Activated Carbon ◽

Rice Husk ◽

Metal Ion ◽

Activated Carbons ◽

Agricultural Waste ◽

Chemical Activation ◽

Ion Concentration ◽

Potato Peel ◽

Tannery Effluents ◽

Chromium Vi

AbstractTwo biomass agricultural waste materials; rice husks (RH) and potato peels (PP) were used as precursors for preparation of activated carbons by chemical activation using phosphoric acid for adsorption of hexavalent chromium [Cr(VI)] from tannery effluents. The prepared rice husk (RH–AC) and potato peel activated carbon (PP–AC) were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray diffraction. Adsorption experiments were performed by varying pH, agitation speed, contact time, adsorbent dose and initial metal ion concentration. Freundlich, Langmuir and Temkin isotherms were used to analyze the equilibrium data obtained at different adsorption conditions. It was found that the adsorption isotherms were well fitted by the Freundlich equation and the adsorption process was found to follow pseudo-second-order rate kinetics. Adsorption results obtained show a maximum Cr(VI) uptake being attained at pH 2.0, with chromium removal efficiency of 99.88% and 99.52% for RH–AC and PP–AC, respectively. RH–AC and PP–AC are effective adsorbent for the removal of chromium(VI) ions from wastewater.

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Chromium removal from tannery effluents by adsorption process via activated carbon chat stems (Catha edulis) using response surface methodology

BMC Research Notes ◽

10.1186/s13104-021-05855-7 ◽

2021 ◽

Vol 14 (1) ◽

Author(s):

Yigezu Mekonnen Bayisa ◽

Tafere Aga Bullo ◽

Desalegn Abdissa Akuma

Keyword(s):

Heavy Metals ◽

Activated Carbon ◽

Removal Efficiency ◽

Cost Effective ◽

Treatment Method ◽

Proximate Analysis ◽

Chromium Removal ◽

Tannery Effluents ◽

Chromium Vi ◽

Before And After

Abstract Objective In tannery processing, water consumption is high, which generates wastewater as a by-product and numerous pollutants such as chromium heavy metals that make adverse effects of water bodies and the surrounding environment. This study analyzed, chromium (VI) removal from wastewater through activated carbon chat stem was investigated. Adsorption is a common treatment method via activated carbon due to its cost-effective, profitable, and removal efficiency of these heavy metals. Results The proximate analysis of moisture content of chat stem has 6%, activated carbon ash content of 17.35%, volatile materials of 20.12%, and fixed carbon contents of 56.53%, which are well-matched the standards quality of activated carbon. As the process parameter varies, the increment of the chromium removal efficiency was from 62.5 to 97.03%. The maximum adsorption efficiency was observed at 30 g/L dosage of the adsorbent, at pH 4, and contact time at 180 min of activated carbon from chat stem waste was found 97.03%. FTIR was used to characterize the surface of the chat stem before and after adsorption. Langmuir and Freundlich are used for short contact time’s adsorption isotherm 0.9839 and 0.9995 respectively, which conformed, no visible change in the corrosion state.

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