| Summary: | 碩士 === 國立交通大學 === 環境工程研究所 === 82 === Naturally occurring earthy-musty odor organics can be
considered as the major sources of complaint by the consumers
of drinking water. According to the results of many studies,it
is found that the geosmin is one kind of earthy-musty odor
products of actinomycetes or blue-green algae. The main
purposes of this study are to analyze geosmin with GC-FID after
concentrating it by CLSA (Closed Loop Stripping Analysis),and
to seek the best method of treating geosmin. In this study, the
major subjects are as follows : 1.The batch-type experiments of
GAC adsorption and ozonation were conducted for the removal of
geosmin in laboratory. Finally, a laboratory-scale of GAC
column was designed to evaluate the parameters of the
adsorption process. The results are concluded as follows: 1.The
removal efficiency of geosmin by GAC adsorption increases with
the increasing of time in 48 hrs,and becomes ineffective after
48 hrs. 2.The results of the experiments indicate that it is
favorable in adsorption capacity to increase the NaCl
concentration from 0.01M to 0.1M. 3.The pH value of solution
has no major effect on adsorption capacity,but the adsorption
cappacity is significantly reduced after adding humic acid.
4.Ozone is a strong oxidant and can cleave the bond of
molecurlar structure easily,but excess ozone dose will produce
adverse adsorptionn behavior of geosmin.In the study,the
overall efficiency is best when apparent ozone dose (AOD)(mg of
O3 /ug of geosmin )is 10.2 5.Finally,after the examination of
breakthrough curve,we can find the GAC bed is feasible for the
removal of geosmin.
|
|---|
