Table 5 Correlation of methane yields (L CH₄/g COD_rem) and Grau coefficients

Study phase A

Y = 0.117x − 0.041 (R ² = 0.937)

Y = 0.156x − 0.05 (R ² = 0.791)

Study phase B

Y = −0.39x + 1.892 (R ² = 0.571)

Y = −0.560x + 1.917 (R ² = 0.390)