Absorption of Modified Zeolite to Odorous Gases Released from Kitchen Waste
Ammonia and methyl mercaptan are two major odorous gases released from kitchen waste. Modified zeolite was used as adsorbent to absorb mixed odorous gases methyl mercaptan and ammonia to study the adsorption performance changes. Effects of drying temperature,impregnation time and impregnation concentration on the structure and adsorption properties of modified zeolite were investigated. Results showed that physical structure has changed after modification,the effects of the temperature,time and concentration on the adsorption all presented the tendency of increasing in beginning and reducing at last. BET surface area and amounts of H3PO4in the modified zeolite affected the adsorption capacity together.When the drying temperature was 70 ℃,the concentration 15% and time 2.5 h,the adsorption ability on mixed gas achieved the best,with the adsorption of ammonia and methyl mercaptan as 224.727 mg/g and 4.527 mg/g,increased by 79.3% and143% compared with the unmodified zeolite.