Abstract
A chromium and tannic acid resistance fungal strain was isolated from tannery effluent, and identified as Aspergillus niveus MCC 1318 based on its rDNA gene sequence. The MIC (minimum inhibitory concentration) of the isolate against chromium and tannic acid was found to be 200 ppm and 5% respectively. Optimization of physiochemical parameters for biosorption of chromium and tannic acid degradation was carried out by Plackett–Burman design followed by response surface methodology (RSM). The maximum chromium removal and tannic acid degradation was found to be 92 and 68% respectively by A. niveus. Chromium removal and tannic acid degradation was increased up to 11 and 6% respectively after optimization. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) was used to investigate biosorption phenomena.
Highlights
Water is the important natural resource for all living forms
Isolation, screening and identification of fungal strain Fifteen chromium resistance and tannic acid degrading fungal strains were isolated from the tannery effluent samples by continuous transfer on minimum salt medium amended with 50 ppm filter sterilized K 2Cr2O7 as Cr(VI) and 0.1% tannic acid as the sole carbon source
The isolates Cr 5 was selected among all the isolated strains for their fast growth rate and relatively higher resistance toward chromium and tannic acid
Summary
Water is the important natural resource for all living forms. This natural resource is being polluted by rapid growth of population, metropolitanization and mechanization (Singanan et al 2007). Industrialization leads to several environmental problems like water, land and air pollution. An extensive volume of wastewater originated from industries which are released into channels either untreated or inadequately treated causing water pollution. The wide spread use of chromium in various products and application in different industrial processes has emitted considerable environmental contamination (Sultan and Hasnain 2007). Tanning industries widely used chromium compounds to convert animal skins and hides into leather, mainly chromium sulphate. Tanneries produced waste water in range of 30–35 L/kg with total
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