Raw water

Difference in SS removal efficiency

Difference in total-P removal efficiencies

Particle content

Phosphate content

With 5 mg-Al/l

With 10 mg-Al/l

With 5 mg-Al/l

With 10 mg-Al/l

Difference

Al:P molar ratio

Difference

Al:P molar ratio

L

L

4.5%

7.0%

12.0%

1.1

9.5%

2.1

M

L

7.5%

3.0%

5.0%

1.1

3.5%

2.1

M

M

5.0%

6.0%

6.5%

0.8

8.0%

1.5

H

L

32.5%

9.0%

44.0%

1.1

17.5%

2.1

H

M

25.0%

8.0%

40.0%

0.8

11.0%

1.5

H

H

25.0%

11.0%

40.0%

0.6

10.0%

1.2