Sample

Before treatment

pH

Suspensions (mg/l)

Copper (mg/l)

Zinc (mg/l)

COD (mg/l)

Cadmium (mg/l)

1

6.28

Not checked

1.539

13.880

165.456

0.027

2

6.62

113.000

0.657

6.990

39.832

0.044