Characterization of Dissolved Organic Matter and Its Removal by Coagulation or Activated Carbon Adsorption Processes
Date Issued
2008
Date
2008
Author(s)
Wong, Ruei-Jyun
Abstract
The properties and removal of dissolved organic matter（DOM） in drinking water was studied in this thesis. The water samples collected from the world were analyzed by SEC（size exclusion chromatography）、EEM（excitation-emission matrix）and some basic analysis. We hoped to generalize relation between the characterization and its source by this analysis. The results showed that the DOC and SEC-UV254 area had similar removal efficienccy in all samples. It represented that the composition of DOM must be similar no matter where the water sample came from There are still many residual DOM in the drinking water today. In order to test the estrogen potential of raw water and treatment water , we use ELISA（Enzyme-Linked ImmunoSorbent Assay） to analyze. The results showed that the raw water of T-C and T-B WTP（Water Treatment Plant）reached 50% inhibition ratio after concentrating 21300 and 10800 times. The clean water of T-C and T-B WTP reached 50% inhibition ratio after concentrating 53100 and 32900 times. The treatment process can removal parts of estrogen potential. Different operation processes and coagulant dosage were tested for improving the removal efficiency of DOM. It had better removal efficiency by higher dosage of coagulant and higher strength of mixing. The maximum SEC-UV254 removal is 56.5% by coagulant. It meat that coagulation process just can removal part of the DOM. Powdered activated carbon（PAC） was used to improve the removal of the dissolved organic matter. All the powdered activated carbon added in the raw water was effective in removing the dissolved organic matter in except for 1000-2000 Da molecule. The SEC-UV254 removal reached to 80% in 15 minutes by dosing 150（mgL-1 as C）PAC. It suggested that PAC adsorption was more efficient to remove DOM than coagulation process.
Subjects
dissolved organic matter
estrogen potential
coagulation
activated carbon
SDGs
Type
thesis
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