Components Acetic acid Butyric acid (mg/l) Ethanol Thin oil       Initial conc. 0.0 0.0 0.0 Final conc. 4869.0 795.3 0.30 Heavy Oil       Initial conc. 0.0 0.0 0.0 Final conc. 700.97 0.0 0.17

Table 4: VFA and ethanol production in heavy and thin oil after fermentation.