Removal of Cr (III) from model solutions and a real effluent byPhanerochaete chrysosporiumisolated living microorganism: equilibrium and kinetics

Abstract

A B S T R A C TRemoval of Cr (III) was investigated using Phanerochaete chrysosporium-isolated living microorganism; pH, contact time, temperature and nutrients addition were examined. It was found that P. chrysosporium can tolerate up to 600 mg/L chromium solution. The optimal growth conditions of the biosorbent were found to be 35˚C, 26 h contact time and pH = 5. In addition, a complex nitrogen substrate, yeast powder, was shown to be most efficient than a synthetic one, like di-hydrogen ammonium phosphate. High chromium removal (98%) was observed in these optimal growth conditions. Experimental data were found to follow a Langmuir isotherm model (r 2 > 0.99). Maximum sorption capacity for the present biosorbent was 213 mg/g according to the Langmuir isotherm model, namely significantly higher than the values reported in the literature, even for activated carbon. The fitting of experimental data onto kinetic models showed the relevance of the pseudo-second-order model (r 2 > 0.99) for Cr (III) sorption by P. chrysosporium. In addition, a real effluent was obtained from tanning factory and was treated to examine process feasibility on real effluents.

Novel magnetically separable anhydride-functionalized Fe3O4@SiO2@PEI-NTDA nanoparticles as effective adsorbents: synthesis, stability and recyclable adsorption performance for heavy metal ions

“…The key subject in adsorption technologies is to develop an efficient adsorbent with a rapid, selective, costeffective and highly effective adsorption process; this has received intensive research attention. Thus, a variety of materials, such as activated carbons, 13 zeolites, 14 and biomaterials, 15 have been investigated as adsorbents for heavy metal ion removal from wastewater. However, these adsorbents generally need to be separated from the water treatment system aer the adsorption process by methods such as centrifugation or ltration.…”

Influence of an electromagnetic field on the bioreduction of chromium (VI) using a mixed culture of microorganisms

“…The use of an initial concentration of 58.82 mg L 21 exhibited the highest removal of chromium in the range of 56-73% for an average residence time of 24 h. Leles [26] studied the biological reduction of chromium (VI) and removal of total chromium in an anaerobic filter followed by a submersion in a biofilter with intermittent aeration using a mixed culture of microorganisms. The results showed that for an initial chromium (VI) concentration of 120 mg L 21 , chromium [(VI) and total] removals were 100% after 168 h. In this work, for an initial chromium (VI) concentration of 100 mg L 21 , the time required for the total reduction of chromium (VI) was only 8 h. Sepehr et al [13] used 35 C, 26 h contact time and pH 5 25 with a complex culture medium and observed high chromium (III) removal (98%). Sepehr et al [11] sought and isolated sustainable microorganisms and studied their application to the removal of Cr (III) from simulated and real solutions.…”

“…The results showed that for an initial chromium (VI) concentration of 120 mg L −1 , chromium [(VI) and total] removals were 100% after 168 h. In this work, for an initial chromium (VI) concentration of 100 mg L −1 , the time required for the total reduction of chromium (VI) was only 8 h. Sepehr et al . used 35°C, 26 h contact time and pH = 25 with a complex culture medium and observed high chromium (III) removal (98%). Sepehr et al .…”

“…It is believed that the enzymatic reduction of Cr (VI) to Cr (III) is one of the defense mechanisms employed by microorganisms living in environments contaminated with Cr (VI). Many researchers reported that biosorption can be a promising and efficient method for the removal of heavy metals . Iwasaka et al .…”

“…It is believed that the enzymatic reduction of Cr (VI) to Cr (III) is one of the defense mechanisms employed by microorganisms living in environments contaminated with Cr (VI). Many researchers reported that biosorption can be a promising and efficient method for the removal of heavy metals [9][10][11][12][13]. Iwasaka et al [14] studied the effects of static magnetic fields on the proliferation of yeasts by performing a comparison of the gas inside a flask with the yeast culture with and without exposure to a magnetic field.…”