Extraction and Adsorption Properties of Extracellular Polymeric Substance

doi:10.12068/j.issn.1005-3026.2021.10.014

Abstract

Abstract: In order to quickly and efficiently extract extracellular polymeric substances(EPS)from activated sludge， four methods were used to extract tightly bound EPS(TB-EPS). The advantages and disadvantages of different extraction methods were compared， the effect of TB-EPS on the adsorption performance of Mn²⁺was investigated， and the adsorption mechanism of TB-EPS was studied. The results show that the heating method is simple and efficient with no damage to cell structure.When adsorbing heavy metal Mn²⁺， the maximum adsorption rate of TB-EPS extracted by heating method is 53.8%. The adsorption process conforms to the second-order reaction kinetic characteristics and the Langmuir adsorption isotherm equation， which is mainly the chemical adsorption. The main adsorption mechanism of TB-EPS is the interaction of hydrophobic tryptophan and tyrosin.

Key words: activated sludge; extracellular polymeric substances(EPS); extraction method; adsorption; Mn²⁺

CLC Number:

TP20

XU Xiao-hui， WEI De-zhou， ZHANG Lan-he. Extraction and Adsorption Properties of Extracellular Polymeric Substance[J]. Journal of Northeastern University(Natural Science), 2021, 42(10): 1467-1474.

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