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초록

Since August, 1994, algal genera have been investigated to understand algal shift and refer
to water treatment process, at the six raw water intakes around on the Han River. We started to
investigate toxic microcystins last year. The results are as follows. Those include algal shift during past
five years and survey result of 2003 mainly.
1. In 2003, 57 algal genera were observed, including Cyanophyta 6 genera, Bacillariophyta 15 genera,
Chrysophyta 3 genera, Cryptophyta 1 genus, Haptophyta 1 genus, Chlorophyta 26 genera, Euglenophyta 2
genus, and Pyrrhophyta 3 genera. The yearly average was 6,635 cells/mL.
2. Dominant algal group was diatoms that held 6,126 cells/mL(92.3%) of 6,635 cells/mL. Most dominant
genus was Cyclotella spp., 5,261 cells/mL(79.3%). Troublesome diatoms in the watertreatment, Melosira
spp., Asterionella spp., Fragilaria spp., Synedra spp., Diatoma spp., were 639 cells/mL(9.6%) and
decreased than 1,336 cells/mL of the past year. The ratio of cyanobacteria was 0.6%(37 cells/mL). Toxic
cyanobacteria, Microcystis spp. and Anabaena spp., were observed maximum 140 cells/mL and 400
cells/mL respectively. Green algae possessed only 3.4%(228 cells/mL) of total number.
3. Through the 22.4 km flow, from the Paldang-Dam to the Jamshil-dammed pool, algae were increased
from 4,449 cells/mL to 8,325 cells/mL(87% increase). The rate is increased than 2001, 2000 and 1999,
respectively 64%, 64% and 37%. Watertreatment-troublesome diatoms were increased 105%, from 408
cells/mL to 835 cells/mL, through flow.
4. Toxic cyanobacteria were grown July, but the maximum outbreaking biomass of Microcystis spp. was
only 400 cells/mL. Microcystins, toxin of cyanobacteria, were not detected in raw water.
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1.서론
2.검사내용 및 방법
3.결과및 고찰
4.결론