Leynen M, Duvivier L, Girboux P, Ollevier F
Laboratory of Ecology and Aquaculture, Katholieke Universiteit Leuven, Naamsestraat 59, Leuven, B-3000, Belgium.
Ecotoxicol Environ Saf. 1998 Oct;41(2):176-9. doi: 10.1006/eesa.1998.1696.
Ozone can be used as an alternative to chlorination to control biofouling in cooling water systems. The possible negative environmental impact of a discharge of ozone-containing cooling water was investigated. The acute toxicity of dissolved ozone was determined for fish larvae of three species [Cyprinus carpio (at 27 degrees C), Leuciscus idus (at 27 degrees C) and Clarias gariepinus (at 32 degrees C)] and to Daphnia magna (at 21 and 27 degrees C). The results indicate that ozone is very harmful to aquatic life. Daphnids are more sensitive to ozone than fish larvae. The mean 48-h LC50 value for the larvae amounts to about 35 microg/liter, while the 48-h NOEC for D. magna was 11 microg/liter (at 21 degrees C). It was concluded that, to protect aquatic life, discharged cooling water should not contain any dissolved ozone. This can be achieved in practice by mixing the treated cooling water with a source of organic substances before discharge, as free ozone will react immediately with organic matter and thus disappear.
臭氧可作为氯化作用的替代物，用于控制冷却水系统中的生物污垢。研究了排放含臭氧的冷却水可能对环境产生的负面影响。测定了溶解臭氧对三种鱼类幼体[鲤鱼（27摄氏度）、雅罗鱼（27摄氏度）和胡子鲶（32摄氏度）]以及大型溞（21和27摄氏度）的急性毒性。结果表明，臭氧对水生生物非常有害。溞类比鱼类幼体对臭氧更敏感。幼体的平均48小时半数致死浓度值约为35微克/升，而大型溞在21摄氏度时的48小时无观察效应浓度为11微克/升。得出的结论是，为保护水生生物，排放的冷却水中不应含有任何溶解的臭氧。在实际操作中，可通过在排放前将处理过的冷却水与有机物质源混合来实现这一点，因为游离臭氧会立即与有机物发生反应并因此消失。
