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This paper aims to evaluate the characteristics of direct and indirect effluents'toxicity level and difference between two test durations (24 h and 48 h) of test method. The proportion of the indirect effluent samples which exceeded the ecotoxicity permit limitations (TU 1 or TU 2) showed more than 2 times higher than that of direct effluent samples. However, effluent toxicity of Wastewater Treatment Plants (WTPs) indicated less than TU 1 regardless of influent toxicity. From this results, treatment process was thought to have a good efficiency. WTP Salinity was very similar between influent and effluent. This trend could be reconfirmed by the component ratio of ion concentration between them and $Na^+$, $SO_4^{2-}$, $C^-$ lions which have a greater percentage than other ions. In addition, in case of high salinity, toxicity value also showed high level. To judge from above results, indirect effluents which were exempted from application of ecotoxicity standards, may need a new effluent limitations regardless of the treatment efficiency of WTP. According to circumstances, effective countermeasure may need to restrain the discharge of salinity-contained effluents which came from indirect-effluent factories. Test duration comparative study indicated that 48 h results were higher toxicity (exceeding rate of ecotoxicity criteria) than 24 h by the 5 to 5.4 percentage. 24 h test duration seemed to be useful in case of rapid detection, whereas 48 h test method could be applied for reinforcement of ecotoxicity regulatory system.
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참고문헌 (16)
참고문헌 신청
Environment Agency / 2007 / The Direct Toxicity Assessment of Aqueous Environmental Samples using the Juvenile Daphnia magna Immobilisation Test
Environment Canada / 2000 / Biological Test Method: Reference Method for Determining Acute Lethality of Effluents to Daphnia Magna, Second Edtion
Federal Ministry for the Environment(BMUB) / 2004 / Promulgation of the New Version of the Ordinance on Requirements for the Discharge of Waste Water into Waters / Waste Water Ordiance. Nature Conservation and Nuclear Safety
Jo, E. S. / 2012 / Improvement Study on Indirect Effluent Discharge System
김종민 / 2017 / 생태독성기준 미적용 업종 사업장 배출수 생태독성 수준 평가 / 한국물환경학회지 33(2):197~202
Environment Canada / 2000 / Biological Test Method: Reference Method for Determining Acute Lethality of Effluents to Daphnia Magna, Second Edtion
Federal Ministry for the Environment(BMUB) / 2004 / Promulgation of the New Version of the Ordinance on Requirements for the Discharge of Waste Water into Waters / Waste Water Ordiance. Nature Conservation and Nuclear Safety
Jo, E. S. / 2012 / Improvement Study on Indirect Effluent Discharge System
김종민 / 2017 / 생태독성기준 미적용 업종 사업장 배출수 생태독성 수준 평가 / 한국물환경학회지 33(2):197~202
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