With rapid mixing, 1 g kaolinwas added to 1 L of the mixture.
After resting the mixture for 30 min, 600mL of the supernatant
from each liter of the mixture was decanted. An aliquot of 10 L
of the collected supernatantwas mixed with 0.072 g/L NaHCO3,
1.2244 g/L NaClO4 and suitable volumes of the stock humic or
salicylic acid solution to yield the final synthetic raw water with
50 mg/L CaCO3 alkalinity, 10−2M ionic strength and 10 NTU
turbidity.
The coagulationwas carried out with rapid mixing at 100 rpm
for 40 s, slow mixing at 20 rpm for 10 min, and followed by a
settling period of 10 min. Samples of the treated water were
collected at a depth of 3 cm below the surface; they were analyzed
for residual turbidity and particle sizes distribution with
a HACH-2100 turbidimeter and a Hiac/Royco MC100S particle
counter. After having been filtered through 0.45m filter
paper, the filtrate was measured using UV absorbance at 254 nm
(UV254) and the DOC.
With rapid mixing, 1 g kaolinwas added to 1 L of the mixture.After resting the mixture for 30 min, 600mL of the supernatantfrom each liter of the mixture was decanted. An aliquot of 10 Lof the collected supernatantwas mixed with 0.072 g/L NaHCO3,1.2244 g/L NaClO4 and suitable volumes of the stock humic orsalicylic acid solution to yield the final synthetic raw water with50 mg/L CaCO3 alkalinity, 10−2M ionic strength and 10 NTUturbidity.The coagulationwas carried out with rapid mixing at 100 rpmfor 40 s, slow mixing at 20 rpm for 10 min, and followed by asettling period of 10 min. Samples of the treated water werecollected at a depth of 3 cm below the surface; they were analyzedfor residual turbidity and particle sizes distribution witha HACH-2100 turbidimeter and a Hiac/Royco MC100S particlecounter. After having been filtered through 0.45m filterpaper, the filtrate was measured using UV absorbance at 254 nm(UV254) and the DOC.
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