Table 5 Experimental variables for SEP process in the DBBE unit.

From: Recovery of fuel from real waste oily sludge via a new eco-friendly surfactant material used in a digital baffle batch extraction unit

Variable

Level

Value

CEA type

8

CEA1, CEA2, CEA3, CEA4, CEA5, CEA6, CEA7, CEA8

Extraction time, min

2

10, 20

Extraction temperature, 0C

3

20, 40, 60

CEA/WSO ratio

4

1, 2, 3, 4

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