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. 2013 Dec 20;11(1):41.
doi: 10.1186/2052-336X-11-41.

Efficiency of non-ionic surfactants - EDTA for treating TPH and heavy metals from contaminated soil

Mansour Baziar  1 , Mohammad Reza Mehrasebi, Ali Assadi, Mehran Mohammadian Fazli, Mohammad Maroosi, Fooad Rahimi
Affiliations

Efficiency of non-ionic surfactants - EDTA for treating TPH and heavy metals from contaminated soil

Mansour Baziar et al. J Environ Health Sci Eng. .

Erratum in

Abstract

Introduction of fuel hydrocarbons and inorganic compounds (heavy metals) into the soil, resulting in a change of the soil quality, which is likely to affect use of the soil or endangering public health and ground water. This study aimed to determine a series of parameters to remediation of TPH and heavy metals contaminated soil by non-ionic surfactants- chelating agents washing process. In this experimental study, the effects of soil washing time, agitation speed, concentration of surfactant, chelating agent and pH on the removal efficiency were studied. The results showed that TPH removal by nonionic surfactants (Tween 80, Brij 35) in optimal condition were 70-80% and 60-65%, respectively. Addition of chelating agent (EDTA) significantly increases Cd and Pb removal. The washing of soil by non- ionic surfactants and EDTA was effective in remediation of TPH and heavy metals from contaminated soil, thus it can be recommended for remediation of contaminated soil.

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Figures

Figure 1
Figure 1
An example of graph obtained in this study.
Figure 2
Figure 2
The effect of agitation speed on removal of TPH using pH slurry: 7, liquid to soil (w/w) 10:1, surfactant to soil: 5 g/kg, contact time: 30 min.
Figure 3
Figure 3
The effect of contact time on removal of TPH using pH slurry: 7; liquid to soil (w/w) 10:1; surfactant to soil: 5 g/kg; agitation speed: 250 rpm.
Figure 4
Figure 4
Removal efficienies of TPH by different concentration of surfactants using pH slurry: 7; liquid to soil (w/w) 10:1; agitation speed: 90 rpm; contact time: 90 min.
Figure 5
Figure 5
Removal efficienies of Pb by different pH using liquid to soil (w/w) 10:1; agitation speed: 90 rpm; contact time: 90 min; Brij 35 concentration: 20 g/kg; Tween 80 concentration: 10 g/kg.
Figure 6
Figure 6
Removal efficienies of Cd by different pH using liquid to soil (w/w) 10:1; agitation speed: 90 rpm; contact time: 90 min; Brij 35 concentration: 20 g/kg; Tween 80 concentration: 10 g/kg.
Figure 7
Figure 7
Removal efficienies of Cd and Pb by different concentrations of EDTA.
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