TABLE 4.

Energy requirements of methane SCP production per step in kWh over the dry mass of product.

Step	Energy requirement (kWh/kg SCP)
	90% gas utilization, low NG energy content	80% gas utilization, high NG energy content
Fermentation	1.6
Centrifugation	0.8
Spray drying	5.8
Air separation	1.5	1.7
Energy equivalent of required natural gas	21.2	32.5
Total energy requirements for methane SCP production	31.0	42.5