Table 3.

Kinetic parameters of struvite crystallization.

	The first period (0–5 min)		The second period (10–70 min)
Amount of Maleic acid	First order kinetic parameter (h−1)	R2	First order kinetic parameter (h−1)	R2
Stirring speed of 300 rpm and T = 30°C
0 ppm	6.534	0.9938	1.776	0.9452
1 ppm	5.586	0.8714	1.614	0.9443
10 ppm	5.544	0.8116	1.614	0.9223
20 ppm	6.102	0.8534	1.608	0.8888
Stirring speed of 300 rpm and T = 40 °C
0 ppm	5.166	0.9922	1.698	0.9656
1 ppm	4.626	0.8872	1.548	0.9320
10 ppm	4.086	0.8949	1.278	0.9602
20 ppm	4.698	0.8150	1.332	0.9400