The coagulation and flocculation properties of an Indonesian indigenous flocculating soil (IFS) were tested for turbid kaolin suspensions and coloured river water.
|Title||Use of Indonesian flocculating soil in water treatment|
|Publication Type||Journal Article|
|Year of Publication||1991|
|Authors||Alaerts, GJ, Buiteman, JP, Rahman, SSA|
|Pagination||p. S95-S101: 6 fig., 5 tab.|
|Keywords||coagulants/flocculants, colour removal, indonesia, laboratory testing, local materials, soils, turbidity removal|
The coagulation and flocculation properties of an Indonesian indigenous flocculating soil (IFS) were tested for turbid kaolin suspensions and coloured river water. The IFS sample was taken an acid sulphate soil type which can be found in most marshy lowlands in Indonesia. The active components of the soil are Fe(II), which oxidises to Fe(III) at neutral or alkaline pH, and Al(III), present in an amount of 25 mg and 6 mg per gram respectively. A dosage of 150 mg IFS/l at a pH range 8-9.5 was found to be optimal. Based on turbidity removal and filterability (MFI), IFS performed better that alum, but was slightly inferior to ferric chloride. Higher dosages of IFS (300 mg/l) were required for 90% colour removal at pH 7-9. In conclusion, IFS was seen as good low-cost coagulant for treating well buffered and alkaline (moderately) turbid water.