Research Article
Combined Application of Coagulation/Flocculation/Sedimentation and Membrane Separation for the Treatment of Laundry Wastewater
Table 6
Effects for the removal of color and turbidity of the wastewater (batch 1).
| | Variables | Color | Turbidity | | Coefficient | Pure error | -value | Coefficient | Pure error | -value |
| | Intercept | 91.4583 | 1.1901 | 0 | 93.8917 | 1.5818 | 0 | | pH (L) | −2.0450 | 0.5950 | 0.0049 | -2.3121 | 0.7909 | 0.0127 | | pH (Q) | −1.2933 | 0.4704 | 0.0176 | -1.3504 | 0.6252 | 0.0517 | | Coagulant concentration (mg L−1) (L) | 2.6300 | 1.0306 | 0.0253 | 4.0263 | 1.3699 | 0.0123 | | Coagulant concentration (mg L−1) (Q) | −16.4150 | 1.4113 | 0 | -14.3875 | 1.8758 | 0 | | pH × concentration | 15.6500 | 1.0306 | 0 | 13.2362 | 1.3699 | 0 |
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(L): linear regression parameter; (Q): quadratic regression parameter.
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