Effects of surfactants on rhizodegradation of oil in a contaminated soil

Abstract

The effects of nonionic surfactants on degradation of engine oil in metal contaminated soil using Indian mustard (Brassica juncea) were investigated. Triton X-100 and Tween 80 were individually applied to test pots in which the soil had been earlier spiked with 500 mg kg(-1) of used engine oil, 500 mg kg(-1) of PbCl(2) and 50 mg kg(-1) of CdCl(2). For he application of Tween 80 to the soil, the fractions of rhizodegraded oil and the fractions of removed metals from the soil were well correlated. On the other hand, such a correlation did not exist between the fractions of rhizodegraded oil and the fractions of removed metals for the application of Triton X-100 to the soil. It was observed that Triton X-100 caused a significant decrease in basal soil respiration (BSR) which can be attributed to a reduction in microbial activity. This, in turn, resulted in a reduction of the rhizodegraded oil fraction. Tween 80 proved to be effective in the rhizodegradation of oil under aerobic conditions. Further, this surfactant seems to have the positive effect on the soil microbial population when viewed in terms of BSR.

Eucalyptus saponin- and sophorolipid-mediated desorption of polycyclic aromatic hydrocarbons from contaminated soil and sediment

“…Further investigations are required to explore the individual and synergistic effects of different PAH and surfactant concentrations, temperature regimes, and various matrices to elucidate the toxicity of the selected surfactant on the soil/sediment microbiome. Although the effect of surfactant application on soil/sediment microbial respiration has been investigated (Memarian and Ramamurthy 2012 ), this is the first study done in the presence of PAHs and biosurfactants. The results shown in Fig.…”

In-Situ Remediation Approaches for the Management of Contaminated Sites: A Comprehensive Overview

“…It was observed that inoculation of diazotrophs with phytoremediators helped to achieve more than 70 % remediation. Under aerobic conditions, surfactant solution (Tween 80) was effective in the rhizodegradation of oil with added benefi t on the indigenous soil microbes (Memarian and Ramamurthy 2012 ). These days, transgenic/genetically modifi ed plants are emerging as a promising technology which is discussed in the later part of this review under emerging techniques.…”

Surfactant assisted removal of Cu(II), Cd(II) and Pb(II) from contaminated soils

“…At high concentrations, surfactants enhance the solubilization of many hydrophobic organic compounds by increasing the solubility of contaminants through micellar solubilization [4,3,22]. The use of soil washing fluids to remove mixed contaminants (organics and heavy metals) present in soils has been successfully demonstrated [11,14,19]. The optimum pHs and surfactant concentrations for the removal of marine diesel fuel from soils, using surfactant SDS and EDTA in the presence and absence of lead in the soil have been determined earlier [22].…”

“…Here, evolved CO 2 served as a measure of oil biodegradation. Also, in a phytoremediation study [11], the amount of CO 2 liberated was used to assess the effectiveness of surfactant enhanced degradation of engine oil present in soil bound mixed contaminants (engine oil and heavy metals). An inclusive site remediation study affirms that a surfactant's ability to remove soil bound metal contaminants is governed by its dosage, initial metal concentration and ability to extract all metal contaminants [21].…”