Abstract:
Three types of twenty-seven adsorbents were selected to study the removal efficiency of 16 off-odors, including 4-methylphenol, 4-ethylphenol, 4-vinylphenol, phenol, guaiacol, 4-methylguaiacol, 4-ethylguaiacol, 4-propylguaiacol, 4-vinylguaiacol, geosmin, 2-heptanol, 3-octanol, 1-octen-3-ol, 1-octen-3-one, E-2-octen-1- ol and E-2-nonenal. Direct immersion-solid phase microextraction (DI-SPME) coupled with gas chromatography-mass spectrometry (GC-MS) , a rapid and accurate method, were employed to quantify the volatile off-odors. The results showed that resins had better removal efficiency than attapulgite clay, diatomaceous earth, bentonite and activated carbon. Generally, the macroporous anion-exchange resin D730, D202 and SD333 had the best removal effect.