ASSESSMENT OF HEAVY METALS UPTAKE BY SOME SELECTIVE BACTERIAL STRAINS ISOLATED FROM HAZARIBAGH TANNERY EFFLUENT IN DHAKA CITY, BANGLADESH: BIOSORPTION VIEWPOINT

Abstract

Biosorption can be defined as a Physiochemical process that cleanses heavy metal-contaminated water and aids in environmental remediation. The present exploration was carried out to examine the metal biosorbent potentiality of five bacterial strains.Biosorption capacity was assessed using Atomic Absorption Spectrophotometer where Bacillus thuringiensis showed uptake of Pb 0.56mg/g that was around 34.74%, Cd 0.38mg/g (20.0%), Ni 0.30 mg/g (15.8%), Cr 0.76mg/g (39.58%), Cu 0.14mg/g (7.61%) and As 0.28mg/g (14.43%) respectively. Micrococcus sp. showed reduction of Pb 0.62mg/g (39.89%), Cd 0.40mg/g (21.10%), Ni 0.22mg/g (11.6%), Cr 0.46mg/g (23.96%), Cu 0.56mg/g (30.43%) and As 0.03mg/g (1.75%) respectively whereas Pseudomonas sp. exhibited reduction of As 0.56mg/g and 0.20mg/g (16% and 10%), Cu 0.26mg/g and 0.46mg/g (14% and 25%), Cr 0.74mg/g and0.56mg/g (39% and 29%), Ni 0.12mg/g and 0.38mg/g (6% and 20%), Pb 0.26mg/g and 0.68mg/g (19% and 41%) and Cd 0.46mg/g and 0.64mg/g (24% and 34%) respectively. The result displayed that the highest degradation of Pb and Cr were shown by Pseudomonas aeruginosa (41±0.01%) and Bacillus thuringiensis (39.58±0.05%) and lowest degradation of As was shown by Micrococcus sp. that was around 1.75±0.001%. By contrast, degradation of Pb in moderate condition was witnessed by Bacillus cereus (19.89±0.01%) and Ni by Bacillus thuringiensis (15.8±0.05%) respectively. Heavy metal’s biosorption is a quick process that might be an advantageous side for the removal of vast range of pollutants.