BIOSORPTION OF CADMIUM AND LEAD USING SUSPENDED AND IMMOBILIZED Enterobacter cloacae AT DIFFERENT PH

Abstract

The aim of this work was to determine the best conditions for biomass production of the bacterium Enterobacter cloacae and for Cd and Pb retention by adsorption on the cell walls or by absorption and accumulation in the bacterial biomass. Suspended and immobilized cultures of this bacterium, acclimated to both metals, were grown for 24 h at pH 6, 7 and 9, in trypticase soy (TS) medium added with 2.73 mg/L of Cd or Palabras clave: metales, cultivo bacteriano, absorción, adsorción, producción de biomasa RESUMEN En este trabajo se determinaron las mejores condiciones para la producción de biomasa y para la retención de Cd y Pb por adsorción en las paredes celulares o por absorción y acumulación en la biomasa bacteriana de Enterobacter cloacae. Con esta finalidad, se mantuvieron durante 24 h a pH 6, 7 y 9 cultivos suspendidos e inmovilizados de esta

Evaluation of the Biostability of Elodea (Egeria densa) and Orange Peel as Bioadsorbent Materials for Pb (II) and Cr (III) in Solution

“…ELO was chosen as the bioadsorbent in which to test the capacity of its associated microbes in order to remove Pb(II) and Cr(III) because it had more microbial growth, including strains that were tolerant to the metals of interest. According to Bojórquez et al (2019), microbial population growth (i.e., increasing cell density) can increase the total availability of active sites for metal adsorption over time. Figure 5 shows the amount of Pb (II) and Cr (III) adsorbed in ELO with the presence (EB1, EB2, and EB3) and absence (MEL) of microorganisms, as well as the adsorbed quantity of metals by microorganisms (MB1, MB2, and MB3) over time.…”