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DOI : 10.17640/KSWST.2016.24.5.59 , Vol.24, No.5, 59 ~ 70, 2016
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| Title |
| A Study on Water Quality Improvement for the Small Scale Water Supply System by Ion Exchange Resin and Electrolysis without Adding Salt |
| 문백수 Bag-sou Moon , 박진영 Chin-young Park , 김오목 Ou-mok Kim , 서상원 Sang-won Seo , 전용성 Yong-seong Jun , 곽영주 Young-ju Kwak |
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| Abstract |
| This study was conducted to effectively control the nitrate-nitrogen and microorganism contamination in the small scale water supply system using the mini-module, the pilot plant and the field demonstration plant in turns. The results were as follows; The ion exchange resin was more effective than RO for removal 01 the nitrate-nitrogen. The nitrate-nitrogen removal rate of RO was constant, but the rate of Ion exchange resin was reduced according to the operation time. The nitrate-nitrogen and sulfate ion were removed up to 90% by ion-exchange resin until regeneration. Chloride ion was increased at the ion exchange resin treated water than raw water. The microorganisms were formed at the ion exchange resin, so a sterilization step is necessary in the water treatment process. The concentration of cations was not changed at the ion exchange resin treatment. Microbial growth happened at the ion-exchange resin, pre-processing filter, and the ultra filtration membrane. The heterotrophic bacteria 420 CFU formed at the ion exchange resin was not detected when sterilized by residual chlorine 0.5 mg/L generated by electrolysis without adding salt. The electricity to make the residual chlorine can be decreased by using the increased chloride ion replaced by nitrate in the ion exchange resin than chloride ion in the raw water, for example when make the residual chlorine 1 mg/L and 6 mg/L, the electricity was reduced 2.9 times, 3.9 times, respectively. |
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| Key Words |
| Ion exchange resin, Electrolysis, RO(Reverse Osmosis Membrane), Nitrate nitrogen, Residual chlorine |
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