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KMID : 0382420010270040015
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Korean Journal of Environmental Health Society
2001 Volume.27 No. 4 p.15 ~ p.24
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he Improvement of Water Quality by Using Filter-aids in Rapid Sand Filters
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Kim Heung-Sun
Zhoh Choon-Koo
Lee Gyu-Seong
Back Young-Ae
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Abstract
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The objective of this study is to evaluate the microbial safety in rapid sand filters adopted in most drinking water treatment plants. The potential pathogens to cause water quality problems are presumed to be Giardia and Cryptosporidium. They look like particles in view of their size. It has been reported that if the number of particles
(larger than 2 ㎛ in water) is less than 100 per mL and its turbidity is below 0.1 NTU, it is considered as a safe water in terms of pathogens.
In order to achieve such a good water quality, filter-aids (chemicals) were added to the inlet-channel of filter and their effectiveness was evaluated on the basis of water quality factors such as turbidity and particle counting. This study was conducted in the three steps of experiment: jar test, pilot plant test and real water treatment plant test (P plant in seoul). The experiment reult of the P water treatment showed that cationic polyamine was the most effective in the removal of particles and turbidity at the dose of 0.25 mg/L. The turbidity without fiter-aids showed in the range of 0.12∼0.17 NTU during filtration and 0.14 NTU on the average. However, with addition of polyamine, the turbidity represented below(or less than) 0.1 NTU after 20 min in the start of filtration and kept 0.08 NTU on the average.
On the other hand, as for number of particles, while no filter-aids led to the range of 111∼270 per mL and 190 on the average, addition of polyamine led to 113 per mL on the average, and kept below 100 per mL after 20 min in the start of filtration.
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