Isolation of Cr(VI) Resistant Bacteria and Exploration of Cr(VI) Removal Mechanism of Strain N-9

Abstract

8 Cr(VI) removing strains were obtained from 24 Cr(VI) resistance bacteria isolates. 6 strains showed more than 50% removal rates for 50 mg/L of Cr(VI) and 5 strains exhibited more than 50% removal rates for 80 mg/L of Cr(VI). Strains n-1, n-6, n-9 and n-12 could remove Cr(VI) more efficient at lower Cr(VI) concentration, while strains n-7, z-2, z-3 and z-7 could remove Cr(VI) at higher concentration. In which, strain n-9 could complete remove Cr(VI) by cultured in TYG broth containing 50 mg/L Cr (VI) at 28°C for 3 days and remove 80.7% of it in 80 mg/L Cr (VI) . Further exploration indicated that strain n-9 could reduce Cr(VI) by endoenzyme related to NADPH, which was carried out by comparing the removal ability of living cells, culture supernatant, inactived cells, cell lysate solution and the effect of SDS, thermal treatment, as well as the oxidoreductase coenzyme NADPH.

Enhancing phytoremediation of chromium-stressed soils through plant-growth-promoting bacteria

“…Being resistant to corrosive agents, chromium (Cr) is used as a protective coating in electroplating industries, manufacturing resistant alloy products, aircrafts and nuclear reactor vessels, electronics, and cement producing plants; its other applications are in tannery, paper industry, negative-film making, wood preservation, pyrotechnics, glass, ceramics and dye synthesis [9], [11], [15], [44], [50]. Due to geological processes as well as the above mentioned anthropogenic activities in addition to spill and dumping of chromium containing wastes, chromium and its compounds get entry into soils.…”

Bioreduction and bioremoval of hexavalent chromium by genetically engineered strains (Escherichia coli MT2A and Escherichia coli MT3)

“…In contrast, Cr(VI) is a known mutagenic and carcinogenic component for both humans and all living organisms due to its strong oxidizing properties (Fernández et al 2010). Cr(VI) is widespread used in industrial applications due to its high resistance to corrosion and hardness (Lu et al 2013). It is commonly used in many industries, such as electroplating, metallurgy, tanning of leather, wood defense, production of stainless steel, paint, pigment and production of pulp (Dhal et al 2013;Jobby et al 2018).…”

Physiological response of the protective enzymatic mechanism of Pontederia parviflora Alexander caused by chromium absorption stress

“…The Chromium stands out among the heavy metals for has diverse industrial applications due to its corrosion resistant quality and hardness. It is used at a large scale in various industries including metallurgical, electroplating, tanning, wood preservation, manufacturing of stainless steel, production of paints, pigments, pulp, and paper (Lu, Ouyang, Zhang, & Lu, 2013). Remediation of Cr is possible through various physical, chemical, and biological method.…”