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Table 1 Summary of significant correlations and corresponding statistical values

From: Enzymatic monitoring and control of a two-phase batch digester leaching system with integrated anaerobic filter

Dependent

Independent

Sample size ( n)

Correlation coefficient ( r)

Correlation coefficient squared (r2)

p Value

Parameter

Measuring point

Parameter

Measuring point

Esterase activity (IU/mL)

Basin 1 + 2

Methane content (vol.%;)

Methane reactor

12

0.87

0.76

2.44 × 10−4

Effluent of the percolator, basin 1 + 2

COD (mg/L)

Effluent of the percolator, basin 1 + 2

184

0.84

0.71

1.64 × 10−50

Input

Age of the silage (month)

Input

8

−0.89

0.79

6.28 × 10−4

Aminopeptidase (IU/mL)

Input

Age of the silage (month)

Input

6

−0.82

0.68

4.35 × 10−2

Input

Cumulative COD yield (mg/L)

Effluent of the percolator

6

0.94

0.88

5.76 × 10−3

Cellulase (IU/mL)

Input

Cumulative COD yield (mg/L)

Effluent of the percolator

6

0.87

0.76

2.43 × 10−2