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3 Polish Journal of Environmental Studies

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Decolorization of textile dye Reactive Blue 221 by bacteria isolated from anthropogenic dye-contaminated soil

100%

Mumtaz S. , Malik N. H. , Naz I. , Ahmed S.

nr 4

The present study was conducted to evaluate the degradative potential of indigenous bacterial isolates for Reactive Blue 221. The two strains proficient in decolorization (>80%) were isolated from a waste disposal site by enrichment technique. Under optimized conditions, Pseudomonas sp. BDS 2 displayed efficient decolorization activity of 94.4% in Minimal Salt Medium supplemented with 50 mg/1 of RB 221 after 96 h of incubations, whereas 88.5% of color was removed by Alcaligenes sp. BDS 9 by the end of 112 h. UV-Visible and FTIR spectroscopy confirmed that in the case of Pseudomonas sp. BDS 2 and Alcaligenes sp. BDS 9, decolorization was the ultimate consequence of biodegradation and adsorption, respectively. Toxicological studies revealed the nontoxic nature of degradative metabolites.

Identification and elucidation of the designing and operational issues of trickling filter systems for wastewater treatment

63%

Ali I. , Khan Z. M. , Peng C. , Naz I. , Sultan M. , Ali M. , Mahmood M. H. , Niaz Y.

nr 6

Water pollution has become a major environmental concern for public and environmental health in developing countries. Water resources are being contaminated mainly due to mixing of domestic, municipal, and industrial wastewaters. The wastewater management and treatment situation is deplorable mainly because of financial constraints, the unavailability of technically trained human resources, and electricity shortages. Moreover, there is a challenge for the scientific community and wastewater management experts to explore cost-effective, simple, reliable, and efficient wastewater treatment systems. Therefore, the present review highlights the option of trickling filter (TF) systems for wastewater treatment in developing countries like Pakistan, India, Bangladesh, and African regions, etc. In addition, the solutions to the operational/performance issues of the TF system are explored and discussed in greater detail for designing/construction of new TF systems and retrofitting the existing TFs.

Removal of Crystal violet and Eriochrome black T dyes from aqueous solutions by magnetic nanoparticles biosynthesized from leaf Extract of Fraxinus chinensis Roxb

63%

Ali I. , Peng C. , Khan Z. M. , Sultan M. , Naz I. , Ali M. , Farid H. U. , Mahmood M. H. , Ahsen R.

tom 28

nr 4

In the present research, a “green” recipe was used to produce innovative phytogenic magnetic nanoparticles (PMNPs) from leaf extract of Fraxinus chinensis Roxb without employing any additional toxic surfactants as capping agents. The convenient reaction between metal salt solution and plant biomolecules occurred within a few minutes by color changes from pale green to intense black, hinting at the production of magnetic nanoparticles (MNPs). The formation of PMNPs was verified by employing different techniques such as UV-visible spectrophotometry, Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The fabricated PMNPs were further utilized as a catalyst for removing toxic dyes, i.e., Crystal violet (CV) and Eriochrome black T (EBT) from aqueous solutions in the presence of hydrogen peroxide (H2O2). The concentrations of CV and EBT were calculated using ultraviolet-visible (UV-vis) spectroscopy throughout all the experiments. The results indicated that PMNPs showed >95% removal of both dyes within 10 min of contact time over a wide range of concentration, 10-300 mg/L. The degradation kinetics were also investigated using first- and second-order rate equations, and the results indicated that kinetic data of both CV and EBT followed first-order degradation rate. Moreover, the removal efficiency of the fabricated PMNPs was alsocompared with chemically synthesized magnetic nanoparticles (CSMNPs), and the results indicated that our fabricated PMNPs were more effective in terms of extent and speed to remove dyes. Finally, we have also proposed a possible removal mechanism. Altogether, the developed “green” recipe can easily be implemented to produce potentially biocompatible and non-toxic PMNPs for treatment of wastewater and can also easily be employed in low-economy countries.