| Summary: | 碩士 === 國立交通大學 === 工學院永續環境科技學程 === 104 === EPA had executed the acute toxicity regulation for high-tech industry wastewater effluent in the science park. Semiconductor industry in the park has the most difficulty in the compliance of regulation, especially for the invertebrate test. Hence, this study adopted invertebrate acute toxicity test (i.e, Daphnia magna) for various effluent in a semiconductor fabrication plant. According to the conductivity or discharge of process effluents, six effluents were sampled and evaluated their contributions to the invertebrate acute toxicity.
The results have shown that the toxicity (TUa) of these 6 effluents are ranked in air conditioning cooling effluent (114.11), RO reclaim effluent (17.45), recycling system reclaim effluent (13.33), waste hydrofluoric acid effluent (9.73), RO reclaim rejection effluent (9.23), and alkaline ammonia effluent (5.63). All these effluents are regarded as very toxic (ie,TUa>5). Among them, air conditioning cooling effluent is the major contributor, and it contributes 69.4% of the toxicity. In the meanwhile, the toxicity of RO reclaim effluent, recycling system reclaim effluent, and waste hydrofluoric acid effluent are highly relative to the conductivity.
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