Enhancement of Oxygen Mass Transfer and Gas Holdup Using Palm Oil in Stirred Tank Bioreactors with Xanthan Solutions as Simulated Viscous Fermentation Broths

Table 2

The enhancement factor of 𝑘_𝐿𝑎 at 10% palm oil fraction.

Agitation rate	Aeration rate
	0.25 vvm	0.75 vvm	1.25 vvm
	(𝑘𝐿𝑎)po/(𝑘𝐿𝑎)𝑜	(𝑘𝐿𝑎)po/(𝑘𝐿𝑎)𝑜	(𝑘𝐿𝑎)po/(𝑘𝐿𝑎)𝑜
400 rpm	2.23	2.95	2.71
600 rpm	2.85	2.65	2.59
800 rpm	1.68	1.49	1.52