| Title |
The Removal Efficiency of Microcystis spp. and Its Ecotoxicity Using Clay |
| Authors |
박혜진 ( Hye Jin Park ) ; 김상훈 ( Sang Hoon Kim ) ; 박상우 ( Woo Sang Park ) ; 이재윤 ( Jae Yoon Lee ) ; 이재안 ( Jae An Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2014.30.3.261 |
| Keywords |
Clay; Daphnia magna; Ecotoxicity; Microcystis; Removal efficiency; Vibrio fischeri |
| Abstract |
Four clays (both natural and commercial types) mainly used in Korea were tested for removal efficiency of Microcystis spp. and ecotoxicity on Daphnia magna and Vibrio fischeri. Four clays (clay A~D) were composed of 91.9~100% of sand (0.02~0.2 mm in particle size). Clay D consisted of lager particles than other clays. Major elements of the four clays were SiO2 (45.3~62.8%), Al2O3 (18.5~29.7%) and Fe2O3 (5.4~7.9%). They contained kaolinite (clay mineral), quartz, muscovite, and so on. Clay C and D contained montmorillonite, one of the clay minerals improving clay-cell aggregation. For clay A, B and C, removal efficiency of Microcystis spp. was over 60% at 2 g/L. It reached about 100% at over 5 g/L. For clay D, it was over 60% and 95~100% at 5 g/L and 20 g/L respectively. After adding clays, pH decreased. The greatest drop of pH appeared at clay C. Except for addition of 100 g/L clay C, ecotoxicity on D. magna and V. fischeri didn’``t appeared at all dose of clays. |