Evaluation of the impacts of seawater integration to electrocoagulation for the removal of pollutants from textile wastewater

Environmental Sciences Europe

Table 3 ANOVA test results for the impact of retention time and seawater percentage on various water quality parameters

Parameter	Mean	Std. Dev	R²	R²-(adj)	C.V. %	Lack of fit	df	Mean square	R²-(predicted)	Analysis of variance (ANOVA)			Efficiency model
Parameter	Mean	Std. Dev	R²	R²-(adj)	C.V. %	Lack of fit	df	Mean square	R²-(predicted)	F-value	p-value	Significance	Efficiency model
pH	10.89	0.1456	0.9542	0.9215	1.34	0.1485	6	0.0247	0.7406	29.16	0.0002	Yes	\(Y=11.08+0.3736\times A+0.4616\times B-0.1057\times AB-0.0832\times {A}^{2}-0.3272\times {B}^{2}\)
Electrical conductivity (μS/cm)	6059.23	201.30	0.9964	0.9938	3.32	283,700.0	5	56731.72	0.9839	388.81	< 0.0001	Yes	\(Y=6275.28+268.75\times A+3469.14\times B+174.75\times AB-14.20\times {A}^{2}-418.19\times {B}^{2}\)
DO (mg/L)	5.59	1.02	0.8446	0.7337	18.30	7.33	6	1.05	0.2539	7.61	0.0095	Yes	\(Y=6.64+0.2940\times A+1.74\times B-0.9892\times AB+0.1021\times {A}^{2}-2.28\times {B}^{2}\)
Removal efficiency of TSS (%)	80.55	11.10	0.9433	0.9028	13.77	861.71	6	143.62	0.8018	23.29	0.0003	Yes	\(Y=100.16+4.89\times A+37.13\times B-8.80\times AB+2.45\times {A}^{2}-42.21\times {B}^{2}\)
Removal efficiency of turbidity (%)	83.98	8.19	0.9525	0.9186	9.76	470.03	6	78.34	0.8725	28.07	0.0002	Yes	\(Y=100.01+1.32\times A+30.41\times B-2.35\times AB+1.80\times {A}^{2}-34.81\times {B}^{2}\)
Removal efficiency of COD (%)	30.11	5.33	0.9121	0.8493	17.71	198.96	6	33.16	0.7106	14.52	0.0014	Yes	\(Y=37.85+2.73\times A+13.91\times B+4.90\times AB+0.2227\times {A}^{2}-15.50\times {B}^{2}\)
Removal efficiency of color (%)	74.62	11.61	0.9535	0.9203	15.55	943.07	5	188.61	0.8622	28.72	0.0002	Yes	\(Y=97.67-0.3101\times A+43.31\times B-0.6838\times AB+3.52\times {A}^{2}-50.87\times {B}^{2}\)