An Investigation on the Lead Removal From Soil Contaminated by Mining and Industrial Wastes Using Soapnut in the Batch Washing Process
 
Więcej
Ukryj
1
School of Energy, Geoscience, Infrastructure and Society Heriot-Watt University, Edinburgh Campus Edinburgh EH14 4AS, Scotland, UK
2
Departamento de Geología, Universidad de Sonora, Rosales y Encinas s/n, Col. Centro, 83000 Hermosillo, Sonora, Mexico
3
Facultad de Ingenieria, Universidad Autónoma de San Luis Potosi, Av. Manuel Nava No. 8, Zona Universitaria, 78290 San Luis Potosi, SLP, Mexico
4
IPICyT, Instituto Potosino de Investigacion Cientifica y Tecnologica, Division de Geociencias Aplicadas, Camino a la Presa San Jose No. 2055, Col. Lomas 4a Sec., 78216 San Luis Potosi, SLP, Mexico;
AUTOR DO KORESPONDENCJI
Bhaskar Sen Gupta   

School of Energy, Geoscience, Infrastructure and Society Heriot-Watt University, Edinburgh Campus Edinburgh EH14 4AS, Scotland, UK
 
 
SŁOWA KLUCZOWE
DZIEDZINY
 
STRESZCZENIE ARTYKUŁU
Abstract Eco-friendly saponin from soapnut was studied for the remediation of the soils contaminated by lead. This study applied a full factorial design of the experiment with 3-factors in 3-level (3x3 factors) to evaluate the effect and interactions of the washing parameters on the lead removal by soapnut in a batch experiment. The parameters studied include: soil-solution ratio, surfactant concentrations by mass, and pH of the washing solution. Two soil samples representing low lead concentration (C1) and high lead concentration were investigated. The findings indicate that the removal efficiency obtained, increases along with the soil-solution ratio and surfactant concentration, but decreases with an increase in the pH of washing solution. Polynomial models were developed to predict the experimental response and optimal conditions. The model predicted a maximum of 50.54% and 47.44% lead removal from the contaminated soil C1 and C2, respectively. Multiple washing was investigated using the higher values of the parameters; the responses obtained significantly increased the percentage of lead removed and achieved 79.98% removal for C1 and 77.49% removal for C2. The effective performance of the soil washing process demonstrates the potential usage of soapnut saponin in the remediation of contaminated soil. Saponin from soapnut is cheap and environment-friendly. Keywords: soapnut; lead; saponin; contaminated soil; soil washing; surfactant