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The Whole Effluent Toxicity Tests of Wastewater Discharged from Various Wastewater Treatment Plants and Their Impact Analyses on Biological Component  

Ra, Jin-Sung (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
Kim, Sang-Don (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
An, Kwang-Guk (School of Bioscience & Biotechnology, Chungnam National University)
Chang, Nam-Ik (Youngsan-river Environmental Research Laboratory)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.4, 2005 , pp. 353-361 More about this Journal
Abstract
In this study, we performed whole effluent toxicity(WET) test and compared the biological component analyses tests for some streams into which wastewater treatment plant effluents are discharged. The test procedures for the WET test and the biological component analysis were conducted according to U.S. EPA guidelines and the Ohio EPA wading method. The WET tests based on the test species of D. manga and S. capricornutum All treatment plants showed a S. capricornutum toxicity, and at 7 sites, except A and J, we could observe a D. magna toxicity. The highest toxicity was observed at site D and this were followed by E and F. The biological component analyses applied to the effluent discharged stream. We found that total species were low at sites C1, D1 and J1 and the low number of total individuals were observed at sites A1, C1, E1, H1, and J1 compared to the controls and other sites. The species richness was low at sites A1, B1, C1, D1, and J1. The species change was evident at site D(D1) and the tolerant species was predominant. The biological analyses and WET tests suggested that the effluents resulted in massive ecosystem impact.
Keywords
Whole Effluent Toxicity Test(WET); Bio-index; Selenatrum Capricornutum; Daphnia Magna;
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