Adsorption of heavy metal tolerance strains to Pb2+ and Cd2+ in wastewater

Environmental Science and Pollution Research International
Dajun Li, Li Zhou

Abstract

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 surfac...Continue Reading

References

Mar 1, 1990·Journal of Bacteriology·P C WangH Ohtake
Feb 7, 2014·Standards in Genomic Sciences·Tito David Peña-Montenegro, Jenny Dussán
Sep 27, 2014·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jiyuan ZhangWeibiao Zhou
Jun 25, 2016·World Journal of Microbiology & Biotechnology·Ayesha Naureen, Abdul Rehman

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Citations

Jan 9, 2019·Environmental Science and Pollution Research International·Rauf ForoutanBahman Ramavandi
May 9, 2019·Environmental Science and Pollution Research International·Mengjie KuangBin Yang
May 9, 2019·Applied Microbiology and Biotechnology·Dipinte GuptaRajiv Ranjan
Feb 22, 2021·Environmental Science and Pollution Research International·Zhiping LiuBin Yang

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