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1991 Nakdong River phenol contamination incident
The Nakdong River phenol contamination incident(낙동강 페놀 오염 사건, 洛東江-汚染事件) is an incident where phenol was leaked into the river from Doosan Electronics. There were two leaks, the first on 1991 March 14 and the second on April 22 with 30 and 1.3 tons of phenol being leaked into the river, respectively. The phenol ended up at a water processing facility used for drinking water in Daegu and started letting off a smell after changing into chlorophenol during water sanitization with chlorine.
== The first leak ==
The first leak occurred at March 14 from 10 pm to 6 am the next day. Due to the 30 tons of phenol, there were places where the phenol concentration of tap water went up to 0.11 ppm, which was 22 times the maximum allowed concentration of phenol in South Korea (0.005 ppm) and 110 times the maximum allowed concentration by the WHO (0.001 ppm). For a short while after this, water processing facilities stopped using chlorine and started using activated charcoal, ozone and chlorine dioxide. 7 employees at the Daegu Department of Environment and 6 Doosan Electronics personnel were arrested, with 11 related public service personnel being jailed as well. Doosan Electronics was shut down for 30 days, but due to the fact that the incident was not done on purpose it was allowed to reopen after 20 days.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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