Adsorption of heavy metal tolerance strains to Pb2+ and Cd2+ in wastewater
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The functional strains with high tolerance to heavy metal Pb2+ and Cd2+ were screened from soil obtained in a heavy metal waste accumulation area. The immobilized biological adsorbent was made by embedding method and used for treatment of wastewater containing heavy metals. The effects of initial concentration of heavy metals, adsorption time, pH value of wastewater, and dosage of adsorbent on adsorption performance were investigated. The study showed (1) the strains tested were Brevibacterium and their maximum tolerable concentrations for Pb2+ and Cd2+ were 2200 and 700 mg/L, respectively; (2) the maximum adsorption rate for Pb2+ and Cd2+ was 87.77% and 57.50% respectively when the dosage of adsorbent was 10 g/L and the pH value of wastewater was 6; (3) Pb2+ and Cd2+ could be adsorbed in the equilibrium solution for 40 min and the maximum adsorption capacity reached 114.36 mg/g and 82.12 mg/g, respectively; and (4) when the initial pH value of the wastewater was 5–7, the adsorption rate decreased with the increase of the concentration, and the initial concentration of Pb2+ had a greater effect on the adsorption rate than Cd2+. Langmuir and Freundlich equation showed that the adsorption of Pb2+ and Cd2+ was mainly on the surface of monolayer. And the pseudo-second-order kinetic equation indicates that Cd2+ has a relatively greater adsorption rate than Pb2+ does.
KeywordsTolerant strain Embedding method Immobilized biological adsorbent Heavy metal wastewater Adsorbent
This work was financially supported by the Hunan province Natural Science Foundation of China (no. 2015JJ5026) and the Scientific Research Project of the Education Department of Hunan Province (no. 14C0317) and the Project of Science and Technology Development of Hengyang City of China (no. 2015KJ31).
- Barnes LJ, Janssen FJ, Sherren J, Versteegh JH, Koch RO, Scheeren HPJ (1991) A new process for the microbial removal of sulphate and heavy metals from contaminated waters extracted by a geohydrological control system. Chem Eng Res Des 69:184–186Google Scholar
- Biziuliavichius GA, Shablinskas AI, Zhukaite VP, Kislukhina OV (1987) Lysosubtilin G10x—a new antimicrobial agent for treatment and prophylaxis. Physico-chemical properties. Antibiot Med Biotechnol 32:331–333Google Scholar
- Chai LY, Ning T, Min XB, Zhuang ML, Long TF (2005) Treatment of chromium wastewater by immobilized sulfate-reducing bacteria-containing activated sludge. J Cent S Univ Technol 36:965–970Google Scholar
- Feng N, Guo (2012) Adsorption of heavy metal ions by saponified orange peel. Chinese J Environ Eng 6:1467–1472Google Scholar
- Freundlich HMF (1906) Uber die adsorption in losungen. Z Phys Chem 57:385–470Google Scholar
- Ghanbarinia F, Kheirbadi M, Mollania N (2015) Comamonas sp. halotolerant bacterium from industrial zone of Jovein of Sabzevar introduced as good candidate to remove industrial pollution. Iran J Microbiol 7:273–280Google Scholar
- Khouja HR, Abba S, Lacercat-Didier L, Daghino S, Doillon D, Richaud P, Martino E, Vallino M, Perotto S, Chalot M, Blaudez D (2013) OmZnT1 and OmFET, two metal transporters from the metal-tolerant strain Zn of the ericoid mycorrhizal fungus Oidiodendron maius, confer zinc tolerance in yeast. Fungal Genet Biol 52:53–64CrossRefGoogle Scholar