Evaluation of heavy metal content in water and removal of metals using native isolated bacterial strains

Abstract. Saleh LIF, Rashed RO, Muhammed SM. 2021. Evaluation of heavy metal content in water and removal metals using native isolated bacterial strains. Biodiversitas 22: 3163-3174. Natural surface sources are susceptible to chemical contamination, including metals. The goals this study were isolate naturally occurring metal-tolerant bacteria by evaluating their ability remove from Tanjaro River assessing the river’s quality. potency (Cd, Pb, Cu, Cr, Ni, Zn, Co, Fe) medium was conducted inductively coupled plasma-optical emission spectrometry. Results physicochemical parameters samples as follows: temperature 11.9–31°C, pH 6.1–8.64, total dissolved solids 268–464 mg.l-1, hardness 232–485 alkalinity 122–324.3 mg.l-1. overall mean concentrations order Zn >Cu> Pb> Ni> Co> Fe> Cr> Cd), with values 0.086, 0.073, 0.71, 0.068, 0.051, 0.056, 0.031, 0.024ppm, respectively Moreover, generally exceeded quality criteria WHO some observations. isolates included both gram-negative (56.5%) gram-positive (43.5%) bacteria. displayed different degrees resistance maximum tolerable (MTCs) ranging (10-250) ppm. Bacillus safensis Leucobacter chromiiresistens able tolerate (80, 90 ppm) Cd, (250, 160 (210,100 (110, Ni (160, 170 while, Proteus mirabilis could ppm Cd. 55.4%Pb, 53.1%Cr, 53.7%Ni, 47.7Fe, 61.4%Co, 55.8% Cu a supplemented mixture these finding indicated that undergoing frequent changes Native possessed considerable tolerance selected metals, which provides promising candidates for use bioremediation.