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J Korean Soc Environ Eng > Volume 41(6); 2019 > Article
J Korean Soc Environ Eng 2019;41(6): 356-360. doi: https://doi.org/10.4491/KSEE.2019.41.6.356
TiCl4 응집을 이용한 조류제거
김경민, 오흥현, 박지원, 최종진, 안종화
강원대학교 건축․토목․환경공학부 환경공학전공
Effect of TiCl4 Coagulation on Algae Removal
Kyung-Min Kim, Heung-Hyun Oh, Ji-Won Park, Jong-Jin Choi, Johng-Hwa Ahn
Division of Architectural, Civil, and Environmental Engineering, Department of Environmental Engineering, Kangwon National University
Corresponding author  Johng-Hwa Ahn ,Tel: 033-250-6357, Fax: 033-250-6357, Email: johnghwa@kangwon.ac.kr
Received: January 28, 2019;  Revised: March 22, 2019;  Accepted: March 29, 2019.  Published online: June 30, 2019.
ABSTRACT
This study evaluated the efficiency of titanium tetrachloride (TiCl4) on chlorophyll-a (105.7±10.2 µg/L) and turbidity (17.5±5.7 NTU (nephelometry turbidity unit)) removals in a pond water compared to aluminum potassium sulfate (AlK(SO4)2). Jar-test experiments were performed at various mixing speeds (rapid: 110~170 rpm, slow: 20~60 rpm), coagulant doses (0.02~0.48 mM), and pH levels (1~12) to determine the conditions at which chlorophyll-a and turbidity removals were most efficient. Within the experimental range, the chlorophyll-a (90~94%) and turbidity (91~93%) removals were high regardless of rapid-mixing speed. The maximum chlorophyll-a removal was 96% at 30 rpm of slow-mixing speed and turbidity removal was ≥90% at ≥30 rpm of slow-mixing speed. The chlorophyll-a removal and turbidity efficiencies increased as TiCl4 concentration ([TiCl4]) increased. The chlorophyll-a removal at [TiCl4]=0.25 mM and the turbidity removal at [TiCl4]=0.39 mM were ≥90%. The chlorophyll-a removals at pH=3~8 were ≥90% and the turbidity removals at pH≥6 were ≥87%. Therefore, the conditions with ≥90% chlorophyll-a and turbidity removals were slow mixing=30 rpm, [TiCl4]≥0.39 mM, and 6≤pH≤8 regardless of rapid-mixing speed.
Key Words: Chlorophyll-a, Coagulant dose, Mixing speed, pH, Titanium Tetrachloride, Turbidity
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