Effects of cell condition, pH, and temperature on lead, zinc, and copper sorption to Acidithiobacillus caldus strain BC13

Abstract

This study describes the effects of cell condition, pH, and temperature on lead, zinc, and copper sorption to Acidithiobacillus caldus strain BC13 with a Langmuir model. Copper exhibited the highest loading capacity, 4.76 ± 0.28 mmol g(-1), to viable cells at pH 5.5. The highest k(L) (binding-site affinity) observed was 61.2 ± 3.0 L mmol(-1) to dehydrated cells at pH 4.0. The pHs that maximized loading capacities and binding-site affinities were generally between 4.0 and 5.5, where the sum of free-proton and complexed-metal concentrations was near a minimum. Of additional importance, lead, zinc, and copper sorbed to viable cells at pH values as low as 1.5. Previous studies with other acidithiobacilli did not measure viable-cell sorption below pH 4.0. In separate experiments, desorption studies showed that far less copper was recovered from viable cells than any other metal or cell condition, suggesting that uptake may play an important role in copper sorption by At. caldus strain BC13. To reflect an applied system, the sorption of metal mixtures was also studied. In these experiments, lead, zinc, and copper sorption from a tertiary mixture were 40.2 ± 4.3%, 28.7 ± 3.8%, and 91.3 ± 3.0%, respectively, of that sorbed in single-metal systems.

Biosorption of lead(II), zinc(II) and nickel(II) from industrial wastewater by Stenotrophomonas maltophilia and Bacillus subtilis

“…This is in agreement with Li et al 30 and Chen et al 16 , who also reported the optimum pH for Zn(II) removal by Pseudomonas putida CZ1 was 5.0. Other studies like Joo et al 17 and Aston et al 31 reported that maximal pH for zinc biosorption for Pseudomonas aeruginosa and Acidithiobacillus caldus BC13 were 6.0 and 4.0, respectively.…”

Effect of overlying water pH, dissolved oxygen and temperature on heavy metal release from river sediments under laboratory conditions

“…Although some research reported that the heavy metals transportation changed with temperature variation (Lourino-Cabana et al, Green-Ruiz et al 2008), there was also some research reported that the infl uence of temperature on metal transportation was not evident (Aston et al 2010, Biesuz et al 1998, Zhang et al 2013.…”

Removal of copper from aqueous solution by electrodeposition in cathode chamber of microbial fuel cell

“…It is a toxic metal, causing many health hazards and harmful biochemical effects on human beings. Numerous treatment technologies have been developed for copper removal, including biosorption [2], adsorption with nanoparticles [3] or zeolites [4], and hybrid processes [5]. Copper is a valuable industrial metal and the recovery of copper from wastewater is attractive.…”