Evaluating GAC and Ozone for removing low concentrations of taste-and-odor organic compound-Geosmin

• Main Authors: Sheng-Shong Ma, 馬勝雄
• Other Authors: Jong-Nan Chen
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/45563745953049912992

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.