알루미늄 가공 공장 배출 방류수의 독성 원인물질 탐색
Application of Toxicity Identification Evaluation Procedures for Toxic Effluents from the Aluminum Rolling Industry
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초록
Objectives: The objective of this study is to identify toxicants causing acute toxicity in effluents from thealuminum rolling industry that violate the discharge limits in Korea. Methods: Whole effluent toxicity tests (WET) were conducted on effluent discharged from the aluminum rollingindustry following the US EPA WET test methods. We collected effluent samples three times and evaluatedacute toxicity by using Daphnia magna. We employed toxicity identification evaluation (TIE) procedures toidentify toxicants causing toxicity in the effluent. Results: No specific chemical groups were identified in the seven different manipulations applied to the ofwastewater effluent samples showing 1.3 toxic units (TU) according to the TIE phase I procedures. Waterquality parameters for water hardness, electric conductivity and heavy metals (Mn) were 4,322 mg/l asCaCO3, 11.39 mS/cm, and 5,551 μg/l, respectively. Considering water hardness and reference toxicity, highconcentrations of Mn can be disqualified from the causative toxicants. Consequently, high ionicconcentrations of Na+(1,648 mg/l), Ca2+(1,048 mg/l), Mg2+(1,428 mg/l) and SO42-(7,472 mg/l) were identifiedto be causative toxicants. Water hardness and electric conductivity exceed the EC50 value obtained bybiological toxicity tests using Daphnia magna. Conclusion: According to TIE procedures, high salt concentration is determined to be a major toxicant in theeffluent of agro-industrial wastewater treatment plants receiving wastewater from the aluminum rolling industry.
Abstract
Objectives: The objective of this study is to identify toxicants causing acute toxicity in effluents from thealuminum rolling industry that violate the discharge limits in Korea. Methods: Whole effluent toxicity tests (WET) were conducted on effluent discharged from the aluminum rollingindustry following the US EPA WET test methods. We collected effluent samples three times and evaluatedacute toxicity by using Daphnia magna. We employed toxicity identification evaluation (TIE) procedures toidentify toxicants causing toxicity in the effluent. Results: No specific chemical groups were identified in the seven different manipulations applied to the ofwastewater effluent samples showing 1.3 toxic units (TU) according to the TIE phase I procedures. Waterquality parameters for water hardness, electric conductivity and heavy metals (Mn) were 4,322 mg/l asCaCO3, 11.39 mS/cm, and 5,551 μg/l, respectively. Considering water hardness and reference toxicity, highconcentrations of Mn can be disqualified from the causative toxicants. Consequently, high ionicconcentrations of Na+(1,648 mg/l), Ca2+(1,048 mg/l), Mg2+(1,428 mg/l) and SO42-(7,472 mg/l) were identifiedto be causative toxicants. Water hardness and electric conductivity exceed the EC50 value obtained bybiological toxicity tests using Daphnia magna. Conclusion: According to TIE procedures, high salt concentration is determined to be a major toxicant in theeffluent of agro-industrial wastewater treatment plants receiving wastewater from the aluminum rolling industry.
참고문헌 (15)
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