In this study, to evaluate the transboundary movement of magnetite waste, the treatment causing possible oxidation and reduction to the highly toxic Cr (VI), as well as other chromium ions must be considered. In this study, we tried to remove chromium using magnetite. The efficiency of chromium removal using magnetite, mixing time, mixing speed, and temperature was evaluated through a jar test. In case of magnetite, the total chromium and hexavalent chromium concentration were rapidly decreased to 0.7 g and 0.35 g, respectively. For mixing speed, the removal efficiency of total chromium was rapidly increased to 150 rpm, but that of hexavalent chromium was almost unchanged. For reaction time, the chromium concentration was almost identical. At 70℃, the removal efficiency of total and hexavalent chromium was 97.2% and 98.8%, respectively; therefore, application of magnetite to actual industrial sites where high-temperature industrial wastewater is generated can be considered.

Abstract
 I. 서 론
 II. 연구 방법
  1. 폐수성상
  2. Magnetite 제조
  3. 실험방법
  4. 분석방법
 III. 결과 및 고찰
  1. Magnetite 주입량에 따른 제거 효율 특성
  2. 교반속도에 따른 제거 효율 특성
  3. 반응시간에 따른 제거 효율 특성
  4. 온도에 따른 제거 효율 특성
 IV. 결 론
 References

• 이지영(충북대학교 환경공학과) | Ji-Young Lee
• 김수진(충북대학교 환경공학과) | Su-Jin Kim
• 김진수(충북대학교 환경공학과) | Jin-Su Kim
• 최승규(충북대학교 환경공학과) | Seong-Kyu Choi
• 주천(충북대학교 환경공학과) | Qian Zhu
• 심재훈(㈜에너엔비텍) | Jae-Hoon Shim
• 이상일(충북대학교 환경공학과) | Sang-Ill Lee Corresponding author