Effects of Air Injection on the Metabolic Activity of Emulsifier-Producing Bacteria from Oil Reservoirs

Table 2

Physicochemical properties of different cultures.

Oxygen condition	Oil droplet size (μm)	Surface tension (mN/m)	Residual sugar (mg/100 mL)	Crude oil viscosity (cP)	Emulsifying viscosity (cP)	Dehydration viscosity (cP)
Aerobic	4.74	52.40	124	184	67	274
Intermittent aeration	10.02	53.44	135		71	263
Facultative anaerobic	—	46.24	2		150	187
Anaerobic	—	50.21	2		166	182