ANOVA for orthophosphate removal by different hydrochars^a.

	SS	df	MSS	F-value	p-value	S/NS
Model	391.8	17	23.05	31.75	<0.0001	S
A-Orthophosphate dose (mg L−1)	29.3	1	29.39	40.48	<0.0001	S
B-pH	2.04	1	2.04	2.81	0.1054	NS
C-Time (h)	200.7	1	200.78	276.5	<0.0001	S
D-Carbon material	14.8	2	7.44	10.25	0.0005	S
AB	1.60	1	1.60	2.20	0.1493	NS
AC	18.15	1	18.15	25.01	<0.0001	S
AD	4.13	2	2.07	2.85	0.0756	NS
BC	0.28	1	0.283	0.391	0.5370	NS
BD	1.72	2	0.860	1.19	0.3210	NS
CD	3.44	2	1.72	2.37	0.1124	NS
A 2	5.09	1	5.09	7.02	0.0133	S
B 2	8.54	1	8.54	11.76	0.0020	S
C 2	74.75	1	74.75	102.9	<0.0001	S
Residual	19.6	27	0.725
Lack of fit	19.4	18s	1.08	48.79	<0.0001	S
Pure error	0.198	9	0.0221
Cor total	411.4	44
Std. dev.	0.8520			R 2		0.9524
Mean	3.81			Adjusted R2		0.9224
C.V.%	22.34			Predicted R2		0.8407

^aS – significant, NS – non-significant.