Organic Acids Conversion in Two-phase of Immobilization Enzyme Acidfication and UASB, Anaerobic Reactor for Wastewater Treatment
固定化酶酸化/UASB两相厌氧有机酸代谢特征

Using immobilization enzyme acidification phase and UASB to produce methane phase as two-phase anaerobic fermentation process,the change characteristics and the change rate of organic acid and ethanol organic,composition and fermentation type as well as COD removal were studied.The experimental results showed that acidfication rate(VFA/COD) was consistently over 28.2%.The concentration of ethanol,acetic acid,butyric acid and propionic acid in acidfication-phase were 44.8%,38.4%,9.8% and 6.9%,respectively,as follow:ethanol>acetic acid>butyric acid>propionic acid.The removal of ethanol,acetic acid,butyric acid and propionic acid in methane production phase were 99.8%,92.0%,59.1% and 46.2%,respectively,and the removal of COD was higher than 90%.The conversion velocity of substrate in the methane production phase showed as follow:ethanol>acetic acid>butyric acid>propionic acid.The fermentation type of the acidification phase was ethanol-type fermentation.The effect of each acid and ethanol conversion on COD removal was as follow: ethanol>acetic acid>butyric acid>propionic acid.