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KMID : 0353019750120010074
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Korean Journal of Public Health
1975 Volume.12 No. 1 p.74 ~ p.80
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An Experimental Study of the Effects of Synthetic Polyectrolyte Coagulant Aid in Turbidity Removal
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Abstract
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A study was carried out to find out the effect of synthetic polyelectrolytes coagulant aid when it was used in conjunction with alum coagulant in turbidity removal.
For this study, samples were collected at Bokwang water Intake of the Han River from July to August 1974.
Turbidity was measured with Hach turbidimeter, coliform groups were examined by membrane filter method and testing methods of the other items were based on the standard methods recommended by APHS.
Main findings were as follows;
1. The optimum concentration of polyelectrolytes to use with 30㎎/ℓalum was determined to 0.1㎎/ℓ. Doses of polyelectrolytes in excess of the optimum yield an undesirable coagulation.
2. To make the effective coagulation polyelectrolytes require the optimum doses of alum. When the concentration of alum was decreased below the optimum dose, inhibition of coagulation was observed.
3. Polyelectrolytes are equally effective on coagulation with variable water temperature.
4. Even in high turbid water, good coagulation os obtained as low turbid water with the addition of polyelectrolytes.
5. Polyelectrolytes extend the range of pH at which alum coagulation can be accomplished in the process of water purification (with polyelectrolytes : pH 6.5∼7.5, alum alone : pH 6.8∼7.1).
6. Reduction in bacteria loading has been found feasible with the addidition of polyelectrolytes.
7. Polyelectrolytes yield large and dense floc which settles rapidly, so settling time may be reduced. (with polyelectrolytes : 15min, alum alone : 30min)
8. Filtration can be facilitated by the addition of polyelectrolytes.
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