Comparative plant uptake and microbial degradation of trichloroethylene in the rhizospheres of five plant species-- implications for bioremediation of contaminated surface soils

Abstract

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Using vegetation to enhance in situ bioremediation

“…Recent results have been presented from an investigation in which water saturated with toluene at 26" C and 0.5 ml/L of 93 percent phenol in water were fed into separate 1.8 m long and 35 cm deep laboratory chambers containing soil with alfalfa growing at the surface [ZO, 12, 221. The ground water was sampled at four sampling wells (ports [1][2][3][4] which were located along the flow path of each chamber. Ports 1 and 2 were 33 cm and 66 cm from the inlet, respectively; ports 3 and 4 were 66 cm and 33 cm from the outlet, respectively.…”

“…Ports 1 and 2 were 33 cm and 66 cm from the inlet, respectively; ports 3 and 4 were 66 cm and 33 cm from the outlet, respectively. The results presented in Tables [1][2][3][4] indicate that significant quantities of the toluene and phenol which enter are not present in the effluent. The results with toluene appear to indicate that microbial degradation occurs in the rhizosphere in the unsaturated zone.…”

“…Anderson [3] has reported that the rhizosphere of growing plants has a beneficial effect on the transformation of trichloroethylene (TCE). When growing plants were present, the microbial activity, biomass, and degradation of TCE in rhizosphere soils were found to be significantly greater than corresponding nonvegetated soils [3,5,351. The presence of vegetation had a positive effect on the transformation of TCE to carbon dioxide.…”

Fate of polycyclic aromatic hydrocarbons in plant-soil systems: Plant responses to a chemical stress in the root zone

“…Regulated air flow was passed through a series of three gas-washing bottles for 30 minutes. Efficiency studies with Carbosorb in an identical experimental setup (Anderson 1991) showed that 70% of the 14002 released from combustion of the standard 14C-methyl methacrylate was trapped by Carbosorb. Therefore, data reported for 14002 in this study were corrected by this efficiency value.…”

Assessment for combined phytoremediation and biomass production on a moderately contaminated soil

“…Phytomanagement thus uses phytoremediation strategies to secure brownfield sites through revegetation, but also has the ambition to develop economic activities generating value chains in areas that were previously deprived of them (French et al 2006;Gerhardt et al 2009;Gomes 2012;Bert et al 2017;Dudai et al 2018). This has been a well-documented technique since the 1990s (Anderson and Walter 1992) and many studies have been conducted to identify suitable plant species that can both meet the requirement of risk management and be valorized through biomass production (e.g. heat generation or bioproducts) (Jiang et al 2015(Jiang et al , 2022Ciadamidaro et al 2019;Padoan et al 2020;Moreira et al 2021;Guidi Nissim and Labrecque 2021).…”