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

2011 International Conference on Electric Technology and Civil Engineering (ICETCE) Pub Date : 2011-04-22 DOI:10.1109/ICETCE.2011.5776119

Jinhua Tang, Guo-ren Xu, Guibai Li, L. Spinosa

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引用次数: 1

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⁺.

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铬(VI)在胞外聚合物(EPS)上的吸附性能

研究了活性污泥中胞外聚合物(EPS)的提取及其对铬(VI) (Cr6+)的吸附性能。考察了吸附时间、pH、EPS质量和初始Cr6+浓度对Cr6+去除率的影响。结果表明，高速离心对EPS的提取效率高，对细胞损伤小，同时提取的EPS对Cr6+的吸附效果好。吸附时间为240 min时，吸附达到平衡，吸附率为50.83%，单位吸附量为19.06 mg g−1 EPS。在初始Cr6+浓度为100 mg L−1的条件下，EPS的最佳pH为6，质量为400 mg L−1。随着Cr6+初始浓度的升高，吸附速率下降，但单位吸附容量增大。结果表明，从活性污泥中提取的EPS可用于去除Cr6+。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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

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