title: Bioremoval and recovery of Cd(II) by Pseudoalteromonas sp. SCSE709-6: Comparative study on growing and grown cells.
abstract: Comparison of the bioremoval and recovery of Cd(II) by growing and grown marine bacterium Pseudoalteromonas sp. SCSE709-6 was performed in batch systems. Bioremoval with growing cells (Sorption I) showed better performance at low Cd(II) concentrations, whereas bioremoval with grown cells (Sorption II) had significant advantages in both removal efficiency and time consumption at high Cd(II) concentrations. The optimal pH was higher for Sorption I than for Sorption II for achieving the maximum Cd(II) removal efficiency. Complete desorption was achieved using either Na2EDTA or HNO3 as eluent. Cd(II) adsorbed on grown cells had higher tendency to be desorbed. Na2EDTA was a preferable eluent for the recycling biomaterials, whereas HNO3 performed better for the final security disposal of sludge. For Sorption II, both Langmuir and Freundlich isotherms well explained the biosorption behavior, and the pseudo-second-order model better expressed biosorption and desorption kinetics.
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, China; State Key Lab of Microbial Technology, Shandong University, Jinan 250100, Shandong, China. Electronic address: wzzhou@sdu.edu.cn.
authors.forename: Weizhi
authors.initials: W
authors.lastname: Zhou
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, China.
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Liu
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, China.
authors.forename: Hai'ou
authors.initials: H
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, China.
authors.forename: Wenqian
authors.initials: W
authors.lastname: Kong
authors.affiliation: State Key Lab of Microbial Technology, Shandong University, Jinan 250100, Shandong, China.
authors.forename: Yuzhong
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000302:isolation & purification*; D004058:Diffusion; D007700:Kinetics; D008962:Models, Theoretical; D031161:Pseudoalteromonas / Q000254:growth & development* / Q000378:metabolism*; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors
chemical_list: D002104:Cadmium
keywords: Bioremoval; Cd(II); Deep-sea bacterium; Recovery; Recycle