Characteristics, Coagulation and Filtration of Soluble Microbial Products and Extracellular Polymeric Substances
Date Issued
2007
Date
2007
Author(s)
Tsai, Bor Nein
DOI
zh-TW
Abstract
The dissolved organic matters (DOM) in the soluble microbial products (SMP), loosely bound extracellular polymeric substances (LBEPS), and tightly bound extracellular polymeric substances (TBEPS) extracted from a wastewater sludge were fractionated using size exclusion chromatography, and were characterized by ultraviolet absorbance at 230, 254, and 280 nm, the dissolved organic carbon (DOC) contents, and the excitation-emission-matrix (EEM) spectra. The DOM of molecular weight (MW) > 20000 Da accounted for 33% for SMP, which incorporated proteins of high aromaticity, and 22% for both LBEPS and TBEPS, which were composed of organic acids-like substances and proteins respectively. Polyaluminum chloride (PACl) coagulation could effectively remove this fraction of DOM. On the other hand, the DOM of MW< 1000 Da were mostly non-aromatic organic acids (and probably also polysaccharides) of low aromaticity for SMP and both EPS, and were hardly removed by PACl coagulation. Based on the EEM and UV absorbance data, proteins of high MW and humic substances were easily removed by PACl coagulation. The present study indicates that, although the chemical characteristics of DOM in SMP and LBEPS were alike, but not identical. The DOM in TBEPS differed significantly from SMP or LBEPS based either on DOC distributions or on EEM fingerprints.
Subjects
微生物溶解性物質
混凝
SMP
coagulation
SDGs
Type
thesis
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