환경영향평가 (Journal of Environmental Impact Assessment)

한국환경영향평가학회 (Korean Society of Environmental Impact Assessment)
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배터리 제조공정에서 배출되는 잠재 유해 물질에 대한 물벼룩과 발광박테리아의 생태독성: 리튬, 니켈, 황산염을 대상으로

Ecotoxicity of Daphnia magna and Aliivibrio fischeri on Potentially Harmful Substances Emissionsfrom Battery Manufacturing Processes: Lithium, Nickel, and Sulfate

  • Inhye Roh (Southeast Medi-Chem Institute) ;
  • Kijune Sung (Department of Ecological Engineering, Pukyong National University)
  • 투고 : 2023.03.06
  • 심사 : 2023.04.17
  • 발행 : 2023.04.30
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초록

이차전지 생산공정에서 발생한 폐수에는 리튬과 고농도의 황산염을 포함하고 있으며 최근에는 에너지 밀도가 높은 High Ni 계열의 전구체 수요가 급증하면서 니켈의 배출도 우려되는 상황이다. 리튬과 황산염의 경우 현재 수질오염물질 배출허용기준에 포함되어 있지 않으므로, 이들이 적절하게 처리되지 못하고 배출되었을 경우 향후 환경에 대한 부정적 영향이 클 수 있을 것으로 예상된다. 따라서 본 연구에서는 물벼룩(Daphnia magna)과 발광박테리아(Aliivibrio fischeri)를 이용하여 이차전지 생산공정 배출수에 포함되어 배출될 수 있는 잠재오염물질인 리튬과 니켈 및 황산염의 생태독성을 평가하였다. 생태독성평가 결과, 물벼룩 24시간, 48시간 리튬 EC50 값은 18.2mg/L, 14.5mg/L, 니켈의 경우 7.2mg/L와 5.4mg/L, 황산염 EC50 값은 4,605.5mg/L, 4,345.0mg/L로 나타나, 물벼룩의 경우 물질 및 반응시간(24시간, 48시간)에 따른 생태독성 차이가 있음을 알 수 있었다. 리튬, 니켈, 황산염에 대한 물벼룩의 EC50을 비교하면, 니켈의 24h 및 48h EC50은 리튬에 비해 39.6-37.2%, 황산염에 비해서는 0.1-0.2% 수준으로 세 물질 중 가장 독성이 강한 것으로 나타났다. 그 차이는 노출시간과 상관없이 유사한 수준으로 나타났다. 반면, 황산염의 EC50은 리튬과 니켈에 비해 각각 253.0-299.7%, 639.5-804.6% 수준으로 세물질 중 독성이 가장 약한 것으로 나타났다. 발광박테리아의 리튬에 대한 30분 EC50 값은 2,755.8mg/L, 니켈은 7.4mg/L, 황산염 EC50 값은 66,047.3mg/L로 니켈과는 달리 리튬과 황산염에 대한 물벼룩과 발광박테리아 생물 종별 민감도 차이도 있음을 확인하였다. 이차전지 배출수 관리를 위해 향후 이들 물질에 대한 복합 독성에 관한 연구가 필요할 것으로 판단된다.

Wastewater generated in the secondary battery production process contains lithium and high-concentration sulfate. Recently, as demand as demand for high-Ni precursors with high-energy density has surged, nickel emission is also a concern. Lithium and sulfate are not included in the current water pollutant discharge standard, so if they are not properly processed and discharged, the negative effect on future environment may be great. Therefore, in this study, the ecotoxicity of lithium, nickel, and sulfate, which are potential contaminants that can be discharged from the secondary battery production process, was evaluated using water flea (Daphnia magna) and luminescent bacteria (Aliivibrio fischeri). As a result of the ecotoxicity test, 24-hour and 48-hour D. magna EC50 values of lithium were 18.2mg/L and 14.5mg/L, nickel EC50 values were 7.2mg/L and 5.4mg/L, and sulfate EC50 values were 4,605.5mg/L and 4,345.0mg/L, respectively. In the case of D. magna, it was found that there was a difference in ecotoxicity according to the contaminants and exposure time (24 hours, 48 hours). Comparing the EC50 of D. magna for lithium, nickel, and sulfate, the EC50 of nickel at 24h and 48h was 39.6-37.2% compared to lithium and 0.1-0.2% compared to sulfate, which was the most toxic among the three substances. The difference appeared to be at a similarlevelregardless of the exposure time. The EC50 of sulfate was 253.0-299.7% and 639.5-804.6%, respectively, compared to lithium and nickel, showing the least toxicity among the three substances. The 30-minute EC50 values of luminescent bacteria forlithium, nickel, and sulfate were 2,755.8mg/L, 7.4mg/L, and 66,047.3mg/L,respectively. Unlike nickel, it was confirmed that there was a difference in sensitivity between D. magna and A. fischeri bacteria to lithium and sulfate. Studies on the mixture toxicity of these substances are needed.

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