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Soil washing - Coggle Diagram
Soil washing
Factors to consider
leaching toxicity
mobility of heavy metals
Stability of heavy metals
Speciation of heavy metals
Washing agent
List
LOw molecular weight Organic Acid
Citric acid
Tartaric Acid
Oxalic acid
Chelating Agent
EDTA
Cheng et al.
The removal of Cu, Ni, and Zn in industrial soil by washing with EDTA-organic acids
0.05M EDTA + 0.2M organic acid
80%+ heavy metal removal
soil leaching toxicity was decreased and the stability of remaining heavy metals was increased, indicating that EDTA-organic acid washing reagents could effectively reduce the ecological risk of contaminated soil
EDTA great metal chelator
Organic acids -> ok metal chelators and decreasepH pormoting heavy metal desorption
Organic acids = (citric acid, oxalic acid, and tartaric acid)
equal volumes were mixed
Process paramters