Table 3 Coded values are used in the CCD model.

From: Removal of organic matter and nutrients from hospital wastewater by electro bioreactor coupled with tubesettler

Codes used

A: pH

B: Current time (min)

C: MLSS (mg L−1)

−1.0

6

20

2000

0.0

8

40

2500

1.0

12

60

3000

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