Figure 2: (A) The total ion current of WCO by gas chromatography mass spectrometry. (B) The total ion current of 0# diesel by gas chromatography mass spectrometry. (C) The total ion current of waste oil by fermentation of soil A for 90 days by gas chromatography mass spectrometry. (D) The total ion current of waste oil by fermentation of soil B for 90 days by gas chromatography mass spectrometry. (E) The total ion current of waste oil by fermentation of soil C for 90 days by gas chromatography mass spectrometry. (F) The calorific values of different oil with diesel as the standard. WCO and oil fermented by soil C are significantly different (P<0.01).