Adsorption properties of chromium (VI) on extracellular polymeric substances (EPS)

Author

Tang, Jinhua ; Xu, Guoren ; Li, Guibai ; Spinosa, Ludovico

Author_Institution

State Key Lab. of Urban Water Resource & Environ., Harbin Inst. of Technol., Harbin, China

fYear

2011

fDate

22-24 April 2011

Firstpage

983

Lastpage

986

Abstract

The extraction of extracellular polymeric substances (EPS) from activated sludge and the absorption properties of chromium (VI) (Cr⁶⁺) on EPS were examined in this experiment. The effects of adsorption time, pH, mass of EPS, and initial Cr⁶⁺ concentration on Cr⁶⁺ removal efficiency were investigated. The results indicated that high speed centrifugation was efficient in the extraction of EPS and caused less damage to cells, meanwhile EPS extracted by this method was efficient in the adsorption of Cr⁶⁺. The adsorption reached equilibrium when the adsorption time was 240 min. The adsorption rate and the unit adsorption capacity were 50.83% and 19.06 mg g^-1 EPS respectively. The optimal pH and mass of EPS were 6 and 400 mg L^-1 on the condition that the initial Cr⁶⁺ concentration was 100 mg L^-1. The adsorption rate declined with the rising of initial Cr⁶⁺ concentration, but the unit adsorption capacity increased. The results demonstrated that the EPS extracted from activated sludge would be applicable to removing Cr⁶⁺.

Keywords

adsorption; biotechnology; chemical engineering; chromium; pH; sludge treatment; Cr⁶⁺; EPS mass; activated sludge; adsorption rate; chromium adsorption properties; chromium removal efficiency; extracellular polymeric substances; pH; Extracellular; Ions; Metals; Microorganisms; Plastics; Polymers; Proteins; adsorption; chromium (VI); extracellular polymeric substances (EPS); extraction;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Technology and Civil Engineering (ICETCE), 2011 International Conference on

Conference_Location

Lushan

Print_ISBN

978-1-4577-0289-1

Type

conf

DOI

10.1109/ICETCE.2011.5776119

Filename

5776119