Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea)
Abstract
:1. Introduction
2. Materials and Methods
2.1. Contaminated Soil Samples
2.2. Binders
2.3. Binder Performance Evaluation Method
- The test was initiated by taking samples of 50 g of air-dried soil as the control and measuring the initial toxic metal concentrations (Pb, Cu, Zn, Cd and Ni). Then, 50 g of stabilised soil under different binder dosages per total weight (1, 3, 5, 7 and 10 wt%) was placed in a 250 mL glass flask and agitated for 2 h at 150 rpm with DI water at an L/S of 3.
- The supernatant fluid from the previous step was extracted 8 h after Step 1. For silty sand soil, however, additional extractions were performed at 12, 24 and 36 h after the first extraction to evaluate the effect of contact time with the binder on soil. After the supernatant fluid was extracted, it was filtered using a 0.45 μm membrane filter and then collocated in a 14 mL tube for toxic metal (Pb, Cu, Zn, Cd and Ni) concentration measurement via inductively coupled plasma optical emission spectroscopy (ICP-OES). Furthermore, pH was measured using a Thermo Scientific Orion 5-Star Plus Portable pH/ORP/ISE/Conductivity/DO Multiparameter Meter Model Number: PH3642-2(Beverly, MA, USA) as presented in Table S2.
- The control samples (without binder) and stabilised soil (after Step 2, solid phase) were placed in an oven and dried at 60 °C for 24 h.
- TCLP test was conducted on all the soil samples obtained after Step 3.
- 5.
- A 2 g sample (from Step 3) was placed in small tubes that contained 40 mL of the extract solution (L/S = 20). Extract solution type depends on the pH of the medium (previously measured in Step 2).
- 6.
- After mixing thoroughly using a rotary tumbler at 30 ± 2 rpm for 18 h, the samples were allowed to settle for 12 h. Then, the supernatant fluid was extracted and sieved using a 0.45 μm membrane filter and collocated in tubes with a 14 mL capacity to measure toxic metal concentration via ICP-OES. For the HCS treated with oyster shell, additional extractions were performed after 1 day and 10 days of mixing to evaluate the effect of contact time.
- 7.
2.4. Measurement of Initial Toxic Metal Concentrations
- C1: metal concentration of the analytical specimens obtained from the calibration curves (mg/L),
- C0: metal concentration of the blank solution obtained from the calibration curve (mg/L),
- f: dilution rate,
- V: volume of the specimen container and
- Wd: dry weight of the soil specimen
Source | USCS 1 | pH | Extraction Method | Extract Fluid 2 | Initial Concentrations | ||||
---|---|---|---|---|---|---|---|---|---|
Pb | Cu | Zn | Cd | Ni | |||||
DI (mg L−1) | DI | 0.015 | 0.110 | 0.045 | 0.002 | - | |||
Case I: Mine area | SM | 8.1 | TCLP (mg L−1) | I | 0.639 | 3.954 | 102.784 | 0.316 | 0.432 |
TCLP (mg Kg−1) | 12.780 | 79.080 | 2055.680 | 6.320 | 8.640 | ||||
DI (mg L−1) | DI | 0.550 | 0.210 | 0.450 | 0.003 | - | |||
Case II: Military area | SW | 6.7 | TCLP (mg L−1) | I | 0.079 | 2.235 | 10.053 | 0.046 | - |
TCLP (mg Kg−1) | 1.580 | 44.700 | 201.060 | 0.920 | - | ||||
DI (mg L−1) | DI | 301.657 | 0.440 | - | - | ||||
Case III: HCS | SW | 4.9 | TCLP (mg L−1) | II | 159.802 | 0.444 | - | - | - |
TCLP (mg kg−1) | 3196.04 | 8.880 | - | - | - |
3. Results
3.1. Effects of Binder and Dosage
3.1.1. Case I: Silty Sand Soil from an Abandoned Metal Mine Site
3.1.2. Case II: Sandy Soil from a Military Service Area
3.1.3. Case III: Handmade Contaminated Soil (HCS)
3.2. Effect of Contact Time
4. Discussion
4.1. Oyster Shell Powder
4.2. Zeolite
4.3. Red Mud
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Torres-Quiroz, C.; Dissanayake, J.; Park, J. Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea). Int. J. Environ. Res. Public Health 2021, 18, 2530. https://doi.org/10.3390/ijerph18052530
Torres-Quiroz C, Dissanayake J, Park J. Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea). International Journal of Environmental Research and Public Health. 2021; 18(5):2530. https://doi.org/10.3390/ijerph18052530
Chicago/Turabian StyleTorres-Quiroz, Cecilia, Janith Dissanayake, and Junboum Park. 2021. "Oyster Shell Powder, Zeolite and Red Mud as Binders for Immobilising Toxic Metals in Fine Granular Contaminated Soils (from Industrial Zones in South Korea)" International Journal of Environmental Research and Public Health 18, no. 5: 2530. https://doi.org/10.3390/ijerph18052530