Immobilization of lead and zinc in contaminated soil using taro stem-derived biochar and apatite amendments: a comparative study of application ratios and pyrolysis temperatures
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Taro stem biochar and apatite effectively immobilize lead and zinc in contaminated soil. Amendments increased soil pH and organic carbon, reducing toxic metal mobility for environmental remediation.
Area Of Science
- Environmental Science
- Soil Science
- Geochemistry
Background
- Soil contamination by heavy metals like lead (Pb) and zinc (Zn) poses significant environmental risks.
- Biochar and apatite are recognized for their potential in soil remediation.
- The combined efficacy of different biochar types and apatite for heavy metal immobilization requires further investigation.
Purpose Of The Study
- To evaluate the effectiveness of taro stem-derived biochar (TSB) produced at different temperatures (300 °C and 500 °C) and apatite in immobilizing Pb and Zn in contaminated soil.
- To determine the optimal amendment ratios for heavy metal immobilization.
- To assess the impact of amendments on soil properties such as pH, organic carbon (OC), and electrical conductivity (EC).
Main Methods
- Incubation of contaminated soil with TSB300, TSB500, and apatite at various ratios (3%, 6%, 10% biochar; 3:3% and 6:6% biochar-apatite mixtures) for one month.
- Analysis of Pb and Zn concentrations in five chemical fractions (exchangeable, carbonate, Fe/Mn oxide, organic carbon, residual) using Tessier's sequential extraction.
- Measurement of soil pH, OC, and EC.
Main Results
- Amendments significantly increased soil pH, OC, and EC compared to the control.
- Exchangeable fractions (F1) of Pb and Zn were reduced by up to 71.8% and 61.5%, respectively.
- Pb and Zn were effectively immobilized, with peak reduction observed at 10% TSB and 6:6% TSB-apatite mixture, enhancing their presence in stable fractions (F4 and F5).
Conclusions
- Taro stem-derived biochar (TSB300, TSB500) and its blends with apatite are effective in immobilizing Pb and Zn in heavily contaminated soils.
- These amendments improve soil physicochemical properties, contributing to metal stabilization.
- The study highlights the potential of TSB and apatite as sustainable solutions for mitigating heavy metal pollution in soils.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
Agricultural Bioremediation
Bioremediation is a useful process in which microbes and bacteria are used to remove toxins and pollutants from the environment. In agricultural practices, the use of fertilizers and pesticides can result in leaching of...