Extraction of Water Treatment Coagulant from Locally Abundant Kaolin Clays

Table 4

Coagulation tests using commercial and local alum.

Alum dose (mg L^−1)	0	10		20		25		30		40
Alum type	I/C	I	C	I	C	I	C	I	C	I	C
Turbidity (NTU)	16.7	15.8	10.1	9.9	6.5	8.8	4.3	7.5	3.5	6.4	3.1
pH	7.7	7.5	7.4	7.3	7.2	6.9	7.0	6.8	6.9	6.7	6.7
Temperature (°C)	18.5	18.4	18.6	19.6	19.5	19.4	19.6	19.6	19.5	19.6	19.4
Conductivity (Sm^−1)	101	114	112	115	116	116	120	121	122	124	125
TOC (mg L^−1)	5.2	4.1	4.3	3.3	3.4	2.5	2.7	2.3	2.5	2.3	2.4