Influence of nanerobic fermentation of cassava waste for producing volatile fatty acids(VFA)

Conventional fermentation and countercurrent anaerobic fermentation were studied to compare the effect of producing acids.When substrate concentration VS(volatile solid) was 40 g/L and temperature was 35 ℃,the concentration of VFA(volatile fatty acids) was 3.4 g/L and 2.5 g/L respectively,the production of VFA(gVFA/gVS) was 0.087 and 0.061 respectively for countercurrent fermentation and conventional fermentation.The result showed that the concentration and production of VFA in countercurrent fermentation increased by 40% and 42.6% respectively.The acetic acid proportion in countercurrent and conventional fermentation were 61.5% and 55.7%,an increase of 9.79% in countercurrent fermentation.