08.08.2015   BIOGAS 1

Response model

1.2.3 Response model

Response models of dry tensile strength, wet tensile strength and degradation period at a=0.05, were significant and the models were shown as equation 3-1, 3-2 and 3-3.

yi=30.38+9.135×10-3xi+5.4×2-1.52×3+0.067×4+0.94×5-1.02xi2-0.64×42-1.15×52+ 1.14x1x4+ 1.24x2x3+0.96x3x4-1.11x4x5 (3-1)

y2=13.81-0.36×1+2.47×2-0.35×3-0.36×4+1.43×5-0.62×42-0.42×52+0.64x1x3+0.46x2x5-0.44

x3x5+0.65x4x5 (3-2)

y3=34.95+0.22×1+3.59×2+0.017×3+0.5×4+2.33×5-1.12×12-1.07×22-1.32×32-0.87×42-0.87×52

+1.67x2x4+1.41x4x5 (3-3)

3.2.2 Analysis of importance of various factors on response functions

Importance of various factors on response functions was shown in table 3-3.

Importance

Source

Dry tensile strength (N)

Wet tensile strength (N)

Degradation period

(D)

Beating degree

1.645

1.046

0.905

Grammage

1.838

1.323

2.341

Rosin

1.094

1.333

0.931

Bauxite

1.344

1.951

2.099

Wet strength agent

1.526

2.839

2.253

Table 3-3. Importance of each factor