DESIGN AND OPTIMIZATION FOR HAZARDOUS JAROSITE WASTE RECYCLING IN ENVIRONMENTALLY SUITABLE COMPOSITE PRODUCTS USING RESPONSE SURFACE METHODOLOGY - Management of Hazardous Residues Containing Cd - page 88

X1 X1 X1

12.97 12.97 12.97

X3 X3 X3

9.20 9.20 9.20

5.44 5.44 5.44

X2 X2 X2

1.68 1.68 1.68 X2 X2 X2

X3 X3 X3

X1 X1 X1

-2.07 -2.07 -2.07

-0.390 -0.390 -0.390 -0.178 -0.178 -0.178 0.035 0.035 0.035 0.247 0.247 0.247 0.460 0.460 0.460

Deviation from Reference Blend Deviation from Reference Blend Deviation from Reference Blend

Figure 23. Response trace plot for leachate of Pb (ppm) in the s/s sintered Jarosite
waste -clay -PCCRs composite bricks.

890.00 890.00

A: Jarosite A: Jarosite

2 2

13.0 9 13.09

10 .2 5 10.25

Design Points Design Points

7 . 4 1 7.41

4.57 4.57

10.2 5 10.25

0.00 0.00 110.00 110.00

2 2

1.73 1.73

1. 73 1.73

2 2 2 2

725.00 725.00 275.00 275.00 615.00 615.00

C: PCCRs C: PCCRs

B: Clay B: Clay

Lead Lead

Figure 24. Response contour plot for leachate of Pb (ppm) in the s/s sintered Jarosite
waste-clay -PCCRs composite bricks.