S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Civil & Environmental Engineering (건설환경공학부) Theses (Master's Degree_건설환경공학부)
Physico-Chemico and Thermally Enhanced Soil Washing for Heavy Metal Contaminated Site at Yongsan Railroad Area
용산 철도부지 중금속 오염토양 정화를 위하여 물리적, 화학적, 열적으로 개선된 토양세척 연구
- 세라드위 아니타
- Park Junboum
- 공과대학 건설환경공학부
- Issue Date
- 서울대학교 대학원
- Soil washing; Railroad contamination; Heavy metal; Physical effect; Chemical effect; Thermal effect
- 학위논문 (석사)-- 서울대학교 대학원 : 건설환경공학부, 2017. 2. 박준범.
- A series of soil washing tests was conducted on railroad site soil with high concentration of copper (Cu), lead (Pb), and zinc (Zn). The initial heavy metal concentration of soil was varied from 1069 mg/kg to 2870 mg/kr for Cu, 873 mg/kg to 3300 mg/kg for Pb, and 279 mg/kg to 829 mg/kg for Zn. Since the soil was heavily contaminated, optimization and enhancement for soil washing was needed. In this study, enhancement performance of soil was conducted based on optimization in chemical aspect and addition of physical and thermal effect in the system. It was found that the proper condition in chemical aspects was using sequential washing by 0.2 M Na2-EDTA solution followed by 0.5 M HCl, 1:5 g/ml of solid liquid ratio, and 30 minutes of contact time. In addition, physical effect affected in breakage soil aggregation, which was found effectively enhance the performance by changing stirring speed to 120 rpm and using dispersing agent 2% in this experiment. Furthermore, more increment of removal efficiency occurred by increasing temperature up to 70 ℃ because it favoured molecular movement and collision between contaminant and washing solution. Nevertheless raising higher temperature would decrease in performance for Cu. Compared to conventional chemically soil washing only, adding physical and thermal effect into the system will enhance performance from 30.0% to 62.5% for Cu, 53.7% to 79.8% for Pb, and 40.7% to 66.5% for Zn.