Raw water for water supply contains various improper constituents such as suspended solids, colloids, dissolved organic materials or microbes which may cause turbidity and colorization. The main reason of applying chlorination could lead to sterilize ...
Raw water for water supply contains various improper constituents such as suspended solids, colloids, dissolved organic materials or microbes which may cause turbidity and colorization. The main reason of applying chlorination could lead to sterilize microbes existing in the drinking water treatment. But chlorination could lead to the formation of disinfection by-products(DBPs) by the reaction of free chlorine with humic substance in the water.
This study was conducted to evaluate Haloacetonitriles Formation Portential(HANFP) by the variations of pH, contaction time and chlorine dose about the raw water
The formation concentration of HANs was increased with increasing chlorine dose, contact time and was reduced with increasing pH. HANFP and UV254 Absorbance showed high correlation by the variation of coagulant dose.
After 24 hours of chlorination, HANFP of raw water correlated with levels of Chlorine dosage and Re-Cl.
We also treated raw water with coagulation-sedimentation using Poly Aluminum Chloride(PAC) process. The concentration of HANFP ranged from 14.835 to 18.361㎍/ℓ in Dongbok.
At pH 6.0 the hightest HANFP measured after chlorination treatment in each raw water were 15.726㎍/ℓ(Dongbok), 11.88㎍/ℓ (Chuam), 21.449㎍/ℓ(Hwangryong).
At 48hours of chlorination treatment in each raw water were 13.472㎍/ℓ (Dongbok), 12.273㎍/ℓ(Chuam), 15.627㎍/ℓ(Hwangryong).